under pressure*

The skutterudite CeOs₄Sb₁₂ exhibits an unusual phase diagram in which the boundary of the field-tuned valence transition between L and H phase takes a wedge-like shape as opposed to the expected elliptical behavior. A quantum critical point (QCP) associated with the field-induced suppression of the low-temperature ordered spin density wave (SDW) phase is thought to be responsible for this anomalous behavior [1, 2].
We present measurements of resistivity, Hall and magnetoresistance, and TDO conductivity under pressures of up to 3 GPa and in magnetic fields up to 41 T. We find that the SDW phase starts to be suppressed at 1.5 GPa, and that the Fermi surface, established by quantum oscillations, experiences an alteration in size and anisotropy with increasing pressure.
We will discuss the phase diagram of CeOs₄Sb₁₂ under pressure and the implications of a shift of the QCP.

[1] Goetze et al., PRB 101 (2020).
[2] Ho et al., PRB 94 (2016).