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원자제어 저차원 전자계 연구단
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Phonon anomalies in pyrochlore iridates studied by Raman spectroscopy

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Title
Phonon anomalies in pyrochlore iridates studied by Raman spectroscopy
Author(s)
Ueda, K; Kaneko, R; Subedi, A; Minola, M; B. J. Kim; Fujioka, J; Tokura, Y; Keimer, B
Publication Date
2019-09
Journal
PHYSICAL REVIEW B, v.100, no.11, pp.5157 -
Publisher
AMER PHYSICAL SOC
Abstract
We report polarization-resolved Raman scattering measurements on single crystals of the pyrochlore compound Eu2Ir2O7 which exhibits a ground state with noncollinear magnetic order, as well as its paramagnetic counterpart Pr2Ir2O7. The spectra reveal the six Raman-active optical phonons expected for the pyrochlore lattice symmetry. Combined with density functional calculations, polarization analysis of the Raman intensity allows us to assign all observed peaks to specific vibration patterns. Whereas most phonon profiles are weakly temperature dependent, an Ir-O-Ir bond-bending vibration in Eu2Ir2O7 exhibits a pronounced Fano asymmetry in the paramagnetic state, and marked softening and line-shape anomalies at the magnetic phase transition. These observations indicate strong electron-phonon interactions, which must be considered in models of the electronic properties and phase behavior of the pyrochlore iridates. In addition, a prominent feature appears at 210 cm(-1) in the Raman spectrum of Eu2Ir2O7 below the magnetic transition temperature, possibly due to a magnetic excitation. ©2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6442
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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2019_PRB_김범준(공동)_Phonon anomalies in pyrochlore iridates studied by Raman spectroscopy_PhysRevB.100.115157.pdfDownload

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