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  Signature of frustrated moments in quantum critical CePd1-xNixAl

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-5199-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-570C-1
Genre: Journal Article

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 Creators:
Sakai, Akito1, Author
Lucas, Stefan2, Author              
Gegenwart, Philipp1, Author
Stockert, Oliver3, Author              
Loehneysen, Hilbert V.1, Author
Fritsch, Veronika1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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 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.

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Language(s): eng - English
 Dates: 2016-12-272016-12-27
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 94 (22) Sequence Number: 220405 Start / End Page: 1 - 5 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008