Superconductivity and antiferromagnetism in Cr-Mo-Ru alloys

Abstract

(Cr1-xMox)75Ru25 alloys with x=0, 3%, 6% or 10% exhibit superconducting properties below 3 K. For low Mo concentrations comparison with theory suggests a coexistence of spin density wave antiferromagnetism and superconductivity while the spin density wave state seems to be absent at higher concentrations. Velocity of sound measurements, fail to reveal any spin density wave antiferromagnetic transitions in the alloys. This is attributed to two possibilities: either the nesting portions of the Fermi surface are very small or, as suggested by susceptibility measurements reported recently on Cr75Ru25, an unknown magnetic phase appears at low temperatures.

Structural, Elastic, and Electronic Properties of Antiperovskite Chromium-Based Carbides ACCr3(A = Al and Ga)

“…Many of chromium alloys such as Cr-Ru, Cr-Rh, and Cr-Ir alloys show superconductivity [13]. And it was found there is spin density wave antiferromagnetism that coexists with superconductivity in Cr 1− Re ( 1 [14], Cr 1− Ru ( 1 [15], and (Cr 1− Mo 5 Ru 5 ( , 0.03, 0.06, and 0.10) [16]. For chromium-based antiperovskites, Wiendlocha et al [17] discussed the possibility of superconductivity in GaNCr 3 and RhNCr 3 , and recent phonon and electron-phonon coupling calculation of RhNCr 3 [18] supports Wiendlocha et al 's prediction.…”