Testing the universal P,T,B behavior of the first order valence transition in YbInCu4

YbInCu4, has been studied extensively as an archetype example of first order valence transition (FOVT), as it was long known as the only stoichiometric compound exhibiting a FOVT at ambient pressure. The system has seen a recent surge in interest with the discovery of a tetragonal distortion through high energy x-ray diffraction, followed by an investigation of the Yb2+/Yb3+ local environment through valence selective x-ray fluorescence holography, and a study of the correlation gap through ARPES. Yet until now, all studies of the magnetic field induced FOVT in YbInCu4 with XRD, XAS, and XMCD have been limited to ambient pressure. Here we propose to simultaneously probe the electronic structure and the magnetic state of YbInCu4 across the field induced FOVT through XAS and XMCD at the Yb L3 edge under multi extreme conditions of temperature, field and pressure for the first time.