Decoupled superconductivity and tunable quantum critical points in Al-doped CrAs (original) (raw)

2018

Abstract

Pressure-induced superconductivity in the helical magnet CrAs occurs in close proximity to a T = 0 K antiferromagnetic (AFM) transition, indicating a possible interplay between the two broken symmetries. When CrAs is doped with Al (Al-CrAs), its AFM ordering temperature TN increases from 260 K to 270 K. With applied pressure, TN decreases and extrapolates to zero Kelvin near 4.5 kbar, which is shifted from the projected critical pressure of 9 kbar of undoped CrAs. Evidence for an AFM quantum-critical point (QCP) near 4.5 kbar in Al-CrAs includes a funnel of anomalously enhanced electron scattering emerging at low temperatures from the critical pressure and a non-Fermi liquid resistivity. Pressure-induced superconductivity, in contrast, is almost independent of Al doping and forms a dome with essentially the identical maximum Tc and same optimal pressure of 9 kbar as in pure CrAs. The clear separation between the AFM QCP and Tc maximum in Al-CrAs suggests that the attractive Cooper-p...

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