Abstract
Pressure-dependent, low-temperature inelastic light (Raman) scattering measurements of KCuF3 show that applied pressure above P *∼7kbar suppresses a previously observed structural phase transition temperature to zero temperature in KCuF3, resulting in the development of a fluctuational (quasielastic) response near T∼0K. This pressure-induced fluctuational response-which we associate with slow fluctuations of the CuF6 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 KCuF3.
Original language | English (US) |
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Article number | 217402 |
Journal | Physical review letters |
Volume | 109 |
Issue number | 21 |
DOIs | |
State | Published - Nov 21 2012 |
ASJC Scopus subject areas
- General Physics and Astronomy