Neutron inelastic scattering measurements of low-energy phonons in the multiferroic BiFeO3

Schneeloch, John A.; Xu, Zhijun; Wen, Jinsheng; Gehring, P. M.; Stock, C.; Matsuda, Masaaki; Winn, Barry L.; Gu, Genda; Shapiro, Stephen M.; Birgeneau, R. J.; Ushiyama, T.; Yanagisawa, Y.; Tomioka, Y.; Ito, T.; Xu, Guangyong

doi:10.1103/PhysRevB.91.064301

Neutron inelastic scattering measurements of low-energy phonons in the multiferroic BiFeO₃

Journal Article · Tue Feb 10 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.064301· OSTI ID:1265315

Schneeloch, John A. ^[1]; Xu, Zhijun ^[2]; Wen, Jinsheng ^[3]; Gehring, P. M. ^[4]; Stock, C. ^[5]; Matsuda, Masaaki ^[6]; Winn, Barry L. ^[6]; Gu, Genda ^[7]; Shapiro, Stephen M. ^[7]; Birgeneau, R. J. ^[3]; Ushiyama, T. ^[8]; Yanagisawa, Y. ^[8]; Tomioka, Y. ^[8]; Ito, T. ^[8]; Xu, Guangyong ^[7]

Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Univ. of Edinburgh, Scotland (United Kingdom)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)

In this study, we present neutron inelastic scattering measurements of the low-energy phonons in single crystal BiFeO₃. The dispersions of the three acoustic phonon modes (LA along [100], TA₁ along [010], and TA₂ along [110]) and two low-energy optic phonon modes (LO and TO₁) have been mapped out between 300 and 700 K. Elastic constants are extracted from the phonon measurements. The energy linewidths of both TA phonons at the zone boundary clearly broaden when the system is warmed toward the magnetic ordering temperature T_N=640 K. In conclusion, this suggests that the magnetic order and low-energy lattice dynamics in this multiferroic material are coupled.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; AC02-98CH10886; AC05-00OR22725

OSTI ID:: 1265315

Alternate ID(s):: OSTI ID: 1181304

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 6 Vol. 91; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Lattice and spin dynamics in multiferroic BiFeO3 and RMnO3 Song, Yan; Xu, Ben; Nan, Ce-Wen National Science Review, Vol. 6, Issue 4 https://doi.org/10.1093/nsr/nwz055	journal	May 2019

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