物理
拉曼光谱
非弹性中子散射
凝聚态物理
相(物质)
拉曼散射
八面体
声子
谱线
材料科学
非弹性散射
散射
光学
量子力学
离子
作者
Shi Yuan,Munho Kim,Jacob T. Seeley,J. C. T. Lee,Siddhartha Lal,Peter Abbamonte,S. L. Cooper
标识
DOI:10.1103/physrevlett.109.217402
摘要
Pressure-dependent, low-temperature inelastic light (Raman) scattering measurements of KCuF(3) show that applied pressure above P* ~ 7 kbar suppresses a previously observed structural phase transition temperature to zero temperature in KCuF(3), resulting in the development of a fluctuational (quasielastic) response near T ~ 0 K. This pressure-induced fluctuational response--which we associate with slow fluctuations of the CuF(6) octahedral orientation--is temperature independent and exhibits a characteristic fluctuation rate that is much larger than the temperature, consistent with quantum fluctuations of the CuF(6) octahedra. A model of pseudospin-phonon coupling provides a qualitative description of both the temperature- and pressure-dependent evolution of the Raman spectra of KCuF(3).
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