TY - JOUR
T1 - Multi-spin-state dynamics during insulator-metal crossover in LaCoO3
AU - Doi, A.
AU - Fujioka, J.
AU - Fukuda, T.
AU - Tsutsui, S.
AU - Okuyama, D.
AU - Taguchi, Y.
AU - Arima, T.
AU - Baron, A. Q.R.
AU - Tokura, Y.
PY - 2014/8/18
Y1 - 2014/8/18
N2 - We have investigated the dynamics of spin-state crossover (SSC) for perovskite LaCoO3 through optical phonons by means of infrared and inelastic x-ray spectroscopy. Upon thermally induced SSC, anomalously dispersionless Co-O bond stretching phonons coupled to the thermally excited spin state have been identified. The enhanced spin-state fluctuation irrespective of the presence of a clear charge gap suggests the emergence of complex spin-state disproportionation involving low-, intermediate-, and high-spin states due to the strong correlation among thermally activated spin states.
AB - We have investigated the dynamics of spin-state crossover (SSC) for perovskite LaCoO3 through optical phonons by means of infrared and inelastic x-ray spectroscopy. Upon thermally induced SSC, anomalously dispersionless Co-O bond stretching phonons coupled to the thermally excited spin state have been identified. The enhanced spin-state fluctuation irrespective of the presence of a clear charge gap suggests the emergence of complex spin-state disproportionation involving low-, intermediate-, and high-spin states due to the strong correlation among thermally activated spin states.
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U2 - 10.1103/PhysRevB.90.081109
DO - 10.1103/PhysRevB.90.081109
M3 - Article
AN - SCOPUS:84928542031
VL - 90
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 8
M1 - 081109
ER -