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


Journal Article

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 measurements. However, evidence for significant spin-phonon coupling is found in the energy widths, and the corresponding lifetimes, of transverse acoustic phonons propagating in the (H00) direction of the Shastry-Sutherland, tetragonal basal plane. Transverse acoustic phonons with energies comparable to and higher than the onset of the two-triplet continuum show substantially increased lifetimes on entering the singlet ground state below ∼10 K. This is qualitatively consistent with the removal of a decay channel for the phonons due to the gapping of the spin excitation spectrum in SrCu 2(BO 3) 2 at low temperatures. © 2012 American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Haravifard, S; Gaulin, BD; Yamani, Z; Dunsiger, SR; Dabkowska, HA

Published Date

  • April 12, 2012

Published In

Volume / Issue

  • 85 / 13

Electronic International Standard Serial Number (EISSN)

  • 1550-235X

International Standard Serial Number (ISSN)

  • 1098-0121

Digital Object Identifier (DOI)

  • 10.1103/PhysRevB.85.134104

Citation Source

  • Scopus