Evidence for a pressure-induced quantum liquid in KCuF$_3$

Details Evidence for a pressure-induced quantum liquid in KCuF$_3$ Evidence for a pressure-induced quantum liquid in KCuF$_3$

2011-07-07

arxiv.org/abs/1107.1433v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

Pressure-dependent, low temperature inelastic light (Raman) scattering measurements of KCuF$_3$ show that applied pressure above $P^{*} \sim$ 7 kbar reverses a previously observed low temperature structural distortion in KCuF$_3$, resulting in the development of a $\omega\sim$ 0 fluctuational (quasielastic)response near $T \sim$ 0 K. This pressure-induced fluctuational "central peak" --- associated 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, $\Gamma\gg\textsl{k}_{B}\textsl{T}$, consistent with quantum fluctuations of the CuF$_6$ octahedra. A model of pseudospin-phonon coupling --- where the pseudospin represents different configurations of the CuF$_6$ octahedral tilts --- nicely describes both the temperature- and pressure-dependent evolution of the Raman spectra of KCuF$_3$.

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