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Sara Haravifard

William M. Fairbank Assistant Professor of Physics
Physics
Box 90305, Durham, NC 27708-0305
099 Physics Bldg, Durham, NC 27708

Selected Publications


Realization of two-sublattice exchange physics in the triangular lattice compound Ba3Er(BO3)3

Journal Article Communications Physics · December 1, 2024 Geometric frustration commonly occurs in materials where magnetic rare-earth ions are arranged on a two-dimensional triangular lattice. These compounds have been gaining significant attention lately, as they hold the promise of revealing unique quantum sta ... Full text Cite

Two-Dimensional Cobalt(II) Benzoquinone Frameworks for Putative Kitaev Quantum Spin Liquid Candidates.

Journal Article Journal of the American Chemical Society · June 2024 The realization and discovery of quantum spin liquid (QSL) candidate materials are crucial for exploring exotic quantum phenomena and applications associated with QSLs. Most existing metal-organic two-dimensional (2D) quantum spin liquid candidates have st ... Full text Cite

Helical magnetic state in the vicinity of the pressure-induced superconducting phase in MnP

Journal Article Physical Review Research · October 1, 2023 MnP is a metal that shows successive magnetic transitions from paramagnetic to ferromagnetic and helical magnetic phases at ambient pressure with decreasing temperature. With applied pressure, the magnetic transition temperatures decrease and superconducti ... Full text Cite

Beyond single tetrahedron physics of the breathing pyrochlore compound Ba3Yb2Zn5 O11

Journal Article Physical Review B · April 1, 2023 Recently, a new class of quantum magnets, the so-called breathing pyrochlore spin systems, have attracted much attention due to their potential to host exotic emergent phenomena. Here, we present magnetometry, heat capacity, thermal conductivity, muon-spin ... Full text Cite

Studying spin diffusion and quantum entanglement with LF- μsR

Conference Journal of Physics: Conference Series · January 1, 2023 LF-μSR studies have previously been used to study the diffusive 1D motion of solitons and polarons in conducting polymers. This type of study was also applied to investigating the diffusive motion of spinons in spin-1/2 antiferromagnetic chains. Recently t ... Full text Cite

Towards understanding the magnetic properties of the breathing pyrochlore compound Ba3Yb2Zn5O11through single-crystal studies

Journal Article npj Quantum Materials · December 1, 2022 Ba3Yb2Zn5O11 is exceptional among breathing pyrochlore compounds for being in the nearly-decoupled limit where inter-tetrahedron interactions are weak, hosting isolated clusters or molecular magnet-like tetrahedra of magnetic ytterbium (Yb3+) ions. In this ... Full text Cite

Spin dynamics, entanglement, and the nature of the spin liquid state in YbZnGaO4

Journal Article Physical Review B · August 1, 2022 Electron spin dynamics was studied down to 80 mK in the triangular-lattice quantum spin-liquid candidate YbZnGaO4 using muon spin relaxation, finding no evidence for freezing or ordering of the Yb spins. The muon spin relaxation rate can be represented by ... Full text Cite

Pressure and field: the keys to unlock exotic states in quantum materials

Conference Acta Crystallographica Section A Foundations and Advances · July 29, 2022 Full text Cite

Discovery of quantum phases in the Shastry-Sutherland compound SrCu2(BO3)2 under extreme conditions of field and pressure.

Journal Article Nature communications · April 2022 The 2-dimensional layered oxide material SrCu2(BO3)2, long studied as a realization of the Shastry-Sutherland spin topology, exhibits a range of intriguing physics as a function of both hydrostatic pressure and magnetic fie ... Full text Cite

Phase diagram of YbZnGaO4 in applied magnetic field

Journal Article npj Quantum Materials · December 1, 2021 Recently, Yb-based triangular-lattice antiferromagnets have garnered significant interest as possible quantum spin-liquid candidates. One example is YbMgGaO4, which showed many promising spin-liquid features, but also possesses a high degree of disorder ow ... Full text Cite

Realization of quantum dipoles in triangular lattice crystal Ba3Yb(B O3)3

Journal Article Physical Review B · December 1, 2021 We investigate the thermodynamic properties of the ytterbium-based triangular lattice compound Ba3Yb(BO3)3. The results demonstrate the absence of any long-range ordering down to 56 mK. Analysis of the magnetization, susceptibility, and specific heat measu ... Full text Cite

Towards understanding the magnetic properties of the breathing pyrochlore compound Ba3Yb2Zn5O11: A single crystal study

Journal Article npj Quantum Materials · November 11, 2021 Ba3Yb2Zn5O11 is unique among breathing pyrochlore compounds for being in the nearly decoupled limit where inter-tetrahedron interactions are weak, hosting isolated clusters or "molecular magnet" like tetrahedra of magnetic ytterbium (Yb3+) ions. In this wo ... Link to item Cite

Understanding quantum materials under extreme sample environments

Conference Acta Crystallographica Section A Foundations and Advances · July 30, 2021 Full text Cite

Phase diagram of the Shastry-Sutherland Compound SrCu2(BO3)2 under extreme combined conditions of field and pressure

Journal Article · July 6, 2021 Motivated by the intriguing properties of the Shastry-Sutherland compound SrCu2(BO3)2 under pressure, with a still debated intermediate plaquette phase appearing at around 20 kbar and a possible deconfined critical point at higher pressure upon entering th ... Link to item Cite

Incommensurate two-dimensional checkerboard charge density wave in the low-dimensional superconductor Ta4Pd3Te16

Journal Article Physical Review Research · December 16, 2020 We report the observation of a two-dimensional (2D) checkerboard charge density wave (CDW) in the low-dimensional superconductor Ta4Pd3Te16. By determining its CDW properties across the temperature-pressure (T-P) phase diagram and comparing with prototypic ... Full text Cite

Realization of two-sublattice exchange physics in the triangular lattice compound Ba3Er(BO3)3

Journal Article Communications Physics · December 1, 2024 Geometric frustration commonly occurs in materials where magnetic rare-earth ions are arranged on a two-dimensional triangular lattice. These compounds have been gaining significant attention lately, as they hold the promise of revealing unique quantum sta ... Full text Cite

Two-Dimensional Cobalt(II) Benzoquinone Frameworks for Putative Kitaev Quantum Spin Liquid Candidates.

Journal Article Journal of the American Chemical Society · June 2024 The realization and discovery of quantum spin liquid (QSL) candidate materials are crucial for exploring exotic quantum phenomena and applications associated with QSLs. Most existing metal-organic two-dimensional (2D) quantum spin liquid candidates have st ... Full text Cite

Helical magnetic state in the vicinity of the pressure-induced superconducting phase in MnP

Journal Article Physical Review Research · October 1, 2023 MnP is a metal that shows successive magnetic transitions from paramagnetic to ferromagnetic and helical magnetic phases at ambient pressure with decreasing temperature. With applied pressure, the magnetic transition temperatures decrease and superconducti ... Full text Cite

Beyond single tetrahedron physics of the breathing pyrochlore compound Ba3Yb2Zn5 O11

Journal Article Physical Review B · April 1, 2023 Recently, a new class of quantum magnets, the so-called breathing pyrochlore spin systems, have attracted much attention due to their potential to host exotic emergent phenomena. Here, we present magnetometry, heat capacity, thermal conductivity, muon-spin ... Full text Cite

Studying spin diffusion and quantum entanglement with LF- μsR

Conference Journal of Physics: Conference Series · January 1, 2023 LF-μSR studies have previously been used to study the diffusive 1D motion of solitons and polarons in conducting polymers. This type of study was also applied to investigating the diffusive motion of spinons in spin-1/2 antiferromagnetic chains. Recently t ... Full text Cite

Towards understanding the magnetic properties of the breathing pyrochlore compound Ba3Yb2Zn5O11through single-crystal studies

Journal Article npj Quantum Materials · December 1, 2022 Ba3Yb2Zn5O11 is exceptional among breathing pyrochlore compounds for being in the nearly-decoupled limit where inter-tetrahedron interactions are weak, hosting isolated clusters or molecular magnet-like tetrahedra of magnetic ytterbium (Yb3+) ions. In this ... Full text Cite

Spin dynamics, entanglement, and the nature of the spin liquid state in YbZnGaO4

Journal Article Physical Review B · August 1, 2022 Electron spin dynamics was studied down to 80 mK in the triangular-lattice quantum spin-liquid candidate YbZnGaO4 using muon spin relaxation, finding no evidence for freezing or ordering of the Yb spins. The muon spin relaxation rate can be represented by ... Full text Cite

Pressure and field: the keys to unlock exotic states in quantum materials

Conference Acta Crystallographica Section A Foundations and Advances · July 29, 2022 Full text Cite

Discovery of quantum phases in the Shastry-Sutherland compound SrCu2(BO3)2 under extreme conditions of field and pressure.

Journal Article Nature communications · April 2022 The 2-dimensional layered oxide material SrCu2(BO3)2, long studied as a realization of the Shastry-Sutherland spin topology, exhibits a range of intriguing physics as a function of both hydrostatic pressure and magnetic fie ... Full text Cite

Phase diagram of YbZnGaO4 in applied magnetic field

Journal Article npj Quantum Materials · December 1, 2021 Recently, Yb-based triangular-lattice antiferromagnets have garnered significant interest as possible quantum spin-liquid candidates. One example is YbMgGaO4, which showed many promising spin-liquid features, but also possesses a high degree of disorder ow ... Full text Cite

Realization of quantum dipoles in triangular lattice crystal Ba3Yb(B O3)3

Journal Article Physical Review B · December 1, 2021 We investigate the thermodynamic properties of the ytterbium-based triangular lattice compound Ba3Yb(BO3)3. The results demonstrate the absence of any long-range ordering down to 56 mK. Analysis of the magnetization, susceptibility, and specific heat measu ... Full text Cite

Towards understanding the magnetic properties of the breathing pyrochlore compound Ba3Yb2Zn5O11: A single crystal study

Journal Article npj Quantum Materials · November 11, 2021 Ba3Yb2Zn5O11 is unique among breathing pyrochlore compounds for being in the nearly decoupled limit where inter-tetrahedron interactions are weak, hosting isolated clusters or "molecular magnet" like tetrahedra of magnetic ytterbium (Yb3+) ions. In this wo ... Link to item Cite

Understanding quantum materials under extreme sample environments

Conference Acta Crystallographica Section A Foundations and Advances · July 30, 2021 Full text Cite

Phase diagram of the Shastry-Sutherland Compound SrCu2(BO3)2 under extreme combined conditions of field and pressure

Journal Article · July 6, 2021 Motivated by the intriguing properties of the Shastry-Sutherland compound SrCu2(BO3)2 under pressure, with a still debated intermediate plaquette phase appearing at around 20 kbar and a possible deconfined critical point at higher pressure upon entering th ... Link to item Cite

Incommensurate two-dimensional checkerboard charge density wave in the low-dimensional superconductor Ta4Pd3Te16

Journal Article Physical Review Research · December 16, 2020 We report the observation of a two-dimensional (2D) checkerboard charge density wave (CDW) in the low-dimensional superconductor Ta4Pd3Te16. By determining its CDW properties across the temperature-pressure (T-P) phase diagram and comparing with prototypic ... Full text Cite

Constraining the Parameter Space of a Quantum Spin Liquid Candidate in Applied Field with Iterative Optimization

Journal Article Phys. Rev. Research · February 20, 2019 Featured Publication The quantum spin liquid (QSL) state is an exotic state of matter featuring a high degree of entanglement and lack of long-range magnetic order in the zero-temperature limit. The triangular antiferromagnet YbMgGaO4 is a candidate QSL host, and precise deter ... Open Access Link to item Cite

Dy2ScNbO7: an unconventional spin ice?

Conference Acta Crystallographica Section A Foundations and Advances · July 20, 2018 Full text Cite

Crystallization of spin superlattices with pressure and field in the layered magnet SrCu2(BO3)2.

Journal Article Nature communications · June 2016 An exact mapping between quantum spins and boson gases provides fresh approaches to the creation of quantum condensates and crystals. Here we report on magnetization measurements on the dimerized quantum magnet SrCu2(BO3)2 at cryogenic temperatures and thr ... Full text Cite

Reply to Zayed: Interplay of magnetism and structure in the Shastry-Sutherland model.

Journal Article Proceedings of the National Academy of Sciences of the United States of America · February 2015 Full text Cite

Quantum Phase Transitions

Chapter · January 1, 2015 Quantum phase transition (QPT) occurs at zero temperature where thermal fluctuations are absent and instead the transition is driven by quantum fluctuations which are tuned by variations in some nonthermal parameters, such as pressure, magnetic field, or c ... Full text Cite

Emergence of long-range order in sheets of magnetic dimers.

Journal Article Proceedings of the National Academy of Sciences of the United States of America · October 2014 Quantum spins placed on the corners of a square lattice can dimerize and form singlets, which then can be transformed into a magnetic state as the interactions between dimers increase beyond threshold. This is a strictly 2D transition in theory, but real-w ... Full text Cite

Order parameter fluctuations at a buried quantum critical point.

Journal Article Proceedings of the National Academy of Sciences of the United States of America · May 2012 Quantum criticality is a central concept in condensed matter physics, but the direct observation of quantum critical fluctuations has remained elusive. Here we present an X-ray diffraction study of the charge density wave (CDW) in 2H-NbSe(2) at high pressu ... Full text Cite

Neutron scattering from the static and dynamic lattice of SrCu 2(BO 3) 2 in its Shastry-Sutherland singlet ground state

Journal Article Physical Review B - Condensed Matter and Materials Physics · April 12, 2012 Elastic and inelastic neutron scattering results show that SrCu 2(BO 3) 2 enters its low-temperature singlet ground state below 10 K without an obvious accompanying structural phase transition, despite suggestions emanating from earlier heat capacity measu ... Full text Cite

Continuous and discontinuous quantum phase transitions in a model two-dimensional magnet.

Journal Article Proceedings of the National Academy of Sciences of the United States of America · February 2012 The Shasty-Sutherland model, which consists of a set of spin 1/2 dimers on a 2D square lattice, is simple and soluble but captures a central theme of condensed matter physics by sitting precariously on the quantum edge between isolated, gapped excitations ... Full text Cite

Coexistence of singlet and ordered S=12 moments in the ground state of the triclinic quantum magnet CuMoO4

Journal Article Physical Review B - Condensed Matter and Materials Physics · September 22, 2011 CuMoO4 is a triclinic quantum magnet based on S=1/2 moments at the Cu2+ site. It has recently attracted interest due to the remarkable changes in its chromic and volumetric properties at high temperatures and in its magnetic properties at low temperatures. ... Full text Cite

Magnetic ordering and tunable structural phase transition in the chromic compound CuMoO4

Journal Article Journal of the Physical Society of Japan · September 1, 2011 We report the first observation of long-range magnetic order in the chromic compound CuMoO4 at 1.75 K by means of a specific heat measurement in zero magnetic field. Magnetization measurements performed up to 57 T at 4.2 K indicate a plateau at 1/3 of the ... Full text Cite

Neutron and x-ray scattering studies of the lightly doped spin-Peierls system Cu1-xCdxGeO3

Journal Article Journal of Physics Condensed Matter · October 31, 2007 Single crystals of the lightly doped spin-Peierls system Cu 1-xCdxGeO3 have been studied using bulk susceptibility, x-ray diffraction, and inelastic neutron scattering techniques. We investigate the triplet gap in the magnetic excitation spectrum of this q ... Full text Cite

Crystal growth and magnetic behaviour of pure and doped SrCu2(11BO3)2

Journal Article Journal of Crystal Growth · August 1, 2007 High quality single crystals of incongruently melting SrCu2(BO3)2, both pure and doped with Mg, La and Na have been grown by optical floating zone (OFZ)-image furnace technique using self-flux. The obtained single crystals were characterized by X-ray powde ... Full text Cite

In-gap spin excitations and finite triplet lifetimes in the dilute singlet ground state system SrCu(2-x)Mgx(BO3)2.

Journal Article Physical review letters · December 2006 High resolution neutron scattering measurements on a single crystal of SrCu(2-x)Mgx(BO3)2 with x approximately 0.05 reveal the presence of new spin excitations within the gap of this quasi-two-dimensional, singlet ground state system. The application of a ... Full text Cite

High-resolution study of spin excitations in the singlet ground state of SrCu2(BO3)2.

Journal Article Physical review letters · December 2004 High-resolution, inelastic neutron scattering measurements on SrCu2(BO3)2, a realization of the Shastry-Sutherland model for two-dimensional Heisenberg antiferromagnets, reveal the dispersion of the three single triplet excitations continuously across the ... Full text Cite