Dynamics of the quantum critical soft-phonon mode in SrTiO3 under pressure
The insulating cubic perovskite SrTiO3 (STO) is an excellent example of a quantum critical paraelectric, lying naturally in close vicinity to a ferroelectric quantum critical point (QCP). Being free from the complications of free electrons or magnetism, it is an excellent system in which to study clean quantum criticality. Recent studies have shown that pressure is an excellent parameter with which to cleanly tune STO away from this quantum critical point, and revealed new behaviour in the dielectric properties associated with the QCP. Relatively small pressures act to dramatically suppress the dielectric susceptibility across a wide temperature range by directly tuning the phonon modes which may be inferred from the dielectric data. We propose to directly measure this soft phonon mode as a function of pressure by inelastic scattering using IN8. Observation of the stiffening of this soft mode with pressure (as inferred from dielectric data) is vital to verify and expand the current theoretical description, which is important for fully understanding the lowest temperature dielectric behaviour as well as the unusual superconductivity in doped STO.
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David M Jarvis; M.J. Coak; Shiyu Deng; C R S Haines; IVANOV Alexandre; LIU Cheng; PIOVANO Andrea; SAXENA Siddharth and WILDES Andrew. (2021). Dynamics of the quantum critical soft-phonon mode in SrTiO3 under pressure. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-213
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