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

Publication ,  Journal Article
Haravifard, S; Fritsch, K; Asano, T; Clancy, JP; Yamani, Z; Ehlers, G; Nishimura, T; Inagaki, Y; Kawae, T; Swainson, I; Gaulin, BD
Published in: 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. This material exhibits a first-order structural phase transition at TC ∼ 190 K as well as a magnetic phase transition at TN ∼ 1.75 K. We report low-temperature heat capacity measurements as well as extensive elastic and inelastic neutron scattering measurements on powder samples taken above and below TN. We observe neutron diffraction consistent with a simple (1/2, 0, 0) antiferromagnetic structure indicating a doubling of the a-axis periodicity below TN. In addition, inelastic neutron scattering above a spin gap of ∼2.3 meV is consistent with triplet excitations out of paired S=1/2 moments which form singlet dimers. Low-lying spin wave excitations are also observed and these originate from ordered S=1/2 moments below T N. Taken together these measurements show the ground state of CuMoO4 to display both nonmagnetic singlets and ferromagnetically coupled spins coexisting within an antiferromagnetic structure below T N ∼ 1.75 K. © 2011 American Physical Society.

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Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

September 22, 2011

Volume

84

Issue

9

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

Citation

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Haravifard, S., Fritsch, K., Asano, T., Clancy, J. P., Yamani, Z., Ehlers, G., … Gaulin, B. D. (2011). Coexistence of singlet and ordered S=12 moments in the ground state of the triclinic quantum magnet CuMoO4. Physical Review B - Condensed Matter and Materials Physics, 84(9). https://doi.org/10.1103/PhysRevB.84.094436
Haravifard, S., K. Fritsch, T. Asano, J. P. Clancy, Z. Yamani, G. Ehlers, T. Nishimura, et al. “Coexistence of singlet and ordered S=12 moments in the ground state of the triclinic quantum magnet CuMoO4.” Physical Review B - Condensed Matter and Materials Physics 84, no. 9 (September 22, 2011). https://doi.org/10.1103/PhysRevB.84.094436.
Haravifard S, Fritsch K, Asano T, Clancy JP, Yamani Z, Ehlers G, et al. Coexistence of singlet and ordered S=12 moments in the ground state of the triclinic quantum magnet CuMoO4. Physical Review B - Condensed Matter and Materials Physics. 2011 Sep 22;84(9).
Haravifard, S., et al. “Coexistence of singlet and ordered S=12 moments in the ground state of the triclinic quantum magnet CuMoO4.” Physical Review B - Condensed Matter and Materials Physics, vol. 84, no. 9, Sept. 2011. Scopus, doi:10.1103/PhysRevB.84.094436.
Haravifard S, Fritsch K, Asano T, Clancy JP, Yamani Z, Ehlers G, Nishimura T, Inagaki Y, Kawae T, Swainson I, Gaulin BD. Coexistence of singlet and ordered S=12 moments in the ground state of the triclinic quantum magnet CuMoO4. Physical Review B - Condensed Matter and Materials Physics. 2011 Sep 22;84(9).

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

September 22, 2011

Volume

84

Issue

9

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences