Evidence of a structural quantum critical point in (CaxSr1-x)3Rh4Sn13 from a lattice dynamics study
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Abstract
Approaching a quantum critical point (QCP) has been an effective route to
stabilize superconductivity. While the role of magnetic QCPs has been
extensively discussed, similar exploration of a structural QCP is scarce due to
the lack of suitable systems with a continuous structural transition that can
be conveniently tuned to 0~K. Using inelastic X-ray scattering, we examine the
phonon spectrum of the nonmagnetic quasi-skutterudite
(Ca
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2469-9969