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Journal Article

Signature of frustrated moments in quantum critical CePd1-xNixAl

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Lucas,  Stefan
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Stockert,  Oliver
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Sakai, A., Lucas, S., Gegenwart, P., Stockert, O., Loehneysen, H. V., & Fritsch, V. (2016). Signature of frustrated moments in quantum critical CePd1-xNixAl. Physical Review B, 94(22): 220405, pp. 1-5. doi:10.1103/PhysRevB.94.220405.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-5199-9
Abstract
CePdAl with Ce 4f moments forming a distorted kagome network is one of the scarce materials exhibiting Kondo physics and magnetic frustration simultaneously. As a result, antiferromagnetic (AF) order setting in at T-N = 2.7 K encompasses only two-thirds of the Ce moments. We report measurements of the specific heat, C, and the magnetic Gruneisen parameter, Gamma(mag), on single crystals of CePd1-xNixAl with x <= 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) approximate to 0.15. Remarkably, two-dimensional AF quantum criticality of Hertz-Millis-Moriya type arises for x = 0.05 and x = 0.1 at the suppression of three-dimensional magnetic order. Furthermore, Gamma(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.