title: Strong Spin-Phonon Coupling Mediated by Single Ion Anisotropy in the All-In-All-Out Pyrochlore Magnet Cd_{2}Os_{2}O_{7}.
abstract: Spin-phonon coupling mediated by single ion anisotropy was investigated using optical spectroscopy and first-principles calculations in the all-in-all-out pyrochlore magnet Cd_{2}Os_{2}O_{7}. Clear anomalies were observed in both the phonon frequencies and linewidths at the magnetic ordering temperature. The renormalization of the phonon modes was exceptionally large, signifying the presence of an unconventional magnetoelastic term from large spin-orbit coupling. In addition, the relative phonon frequency shifts show a strong correlation with the modulation of noncubic crystal field by the corresponding lattice distortion. Our observation establishes a new type of spin-phonon coupling through single ion anisotropy, a second-order spin-orbit coupling term, in Cd_{2}Os_{2}O_{7}.
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: C H
authors.initials: CH
authors.lastname: Sohn
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: C H
authors.initials: CH
authors.lastname: Kim
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: L J
authors.initials: LJ
authors.lastname: Sandilands
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: N T M
authors.initials: NT
authors.lastname: Hien
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: S Y
authors.initials: SY
authors.lastname: Kim
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: H J
authors.initials: HJ
authors.lastname: Park
authors.affiliation: Department of Physics, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea.
authors.forename: K W
authors.initials: KW
authors.lastname: Kim
authors.affiliation: Department of Physics, Hanyang University, Seoul 133-791, Republic of Korea.
authors.forename: S J
authors.initials: SJ
authors.lastname: Moon
authors.affiliation: Materials Research Center for Element Strategy, Tokyo Institute of Technology, Kanagawa 226-8503, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Yamaura
authors.affiliation: ISSP, University of Tokyo, Kashiwa 277-8581, Japan.
authors.forename: Z
authors.initials: Z
authors.lastname: Hiroi
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-742, Republic of Korea.|Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: T W
authors.initials: TW
authors.lastname: Noh