Signature of frustrated moments in quantum critical CePd${}_{1-x}$Ni${}_x$Al

Abstract

CePdAl with Ce $4f$ moments forming a distorted kagomé network is one of the scarce materials exhibiting Kondo physics and magnetic frustration simultaneously. As a result, antiferromagnetic (AF) order setting in at $T_{\mathrm{N}}=2.7$~K encompasses only two thirds of the Ce moments. We report measurements of the specific heat, $C$, and the magnetic Grüneisen parameter, ${\Gamma }_{\mathrm{mag}}$, on single crystals of CePd${}_{1-x}$Ni${}_x$Al with $x\le 0.16$ at temperatures down to 0.05~K and magnetic fields $B$ up to $8$~T. Field-induced quantum criticality for various concentrations is observed with the critical field decreasing to zero at $x_c\approx 0.15$. Remarkably, two-dimensional (2D) AF quantum criticality of Hertz-Millis-Moriya type arises for $x=0.05$ and $x=0.1$ at the suppression of 3D magnetic order. Furthermore, ${\Gamma }_{\mathrm{mag}}(B)$ shows an additional contribution near $2.5$~T for all concentrations which is ascribed to correlations of the frustrated one third of Ce moments.

arXiv comment5+2 pages with 4+3 figures

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