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Author (up) Sereni, J.G.; Westerkamp, T.; Kuchler, R.; Caroca-Canales, N.; Gegenwart, P.; Geibel, C. doi  openurl
  Title Ferromagnetic quantum criticality in the alloy CePd1-xRhx Type Journal Article
  Year 2007 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 75 Issue 2 Pages 024432  
  Abstract The CePd1-xRhx alloy exhibits a continuous evolution from ferromagnetism (T-C=6.5 K) at x=0 to a mixed-valence (MV) state at x=1. We have performed a detailed investigation on the suppression of the ferromagnetic (F) phase in this alloy using dc (chi(dc)) and ac (chi(ac)) susceptibility, specific heat (C-m), resistivity (rho), and thermal expansion (beta) techniques. Our results show a continuous decrease of T-C(x) with negative curvature down to T-C=3 K at x(*)=0.65, where a positive curvature takes over. Beyond x(*), a cusp in chi(ac) is traced down to T-C(*)=25 mK at x=0.87, locating the critical concentration between x=0.87 and 0.90. The quantum criticality of this region is recognized by the -log(T/T-0) dependence of C-m/T, which transforms into a T-q (q approximate to 0.5) one at x=0.87. At high temperature, this system shows the onset of valence instability revealed by a deviation from Vegard's law (at x(V)approximate to 0.75) and increasing hybridization effects on high-temperature chi(dc) and rho(T). Coincidentally, a Fermi liquid contribution to the specific heat (gamma) arises from the MV component, which becomes dominant at the CeRh limit. In contrast to antiferromagnetic systems, no C-m/T flattening is observed for x > x(cr) but, rather, the mentioned power-law divergence, which coincides with a change of sign of beta(T). The coexistence of F and MV components and the sudden changes in the T dependencies are discussed in the context of randomly distributed magnetic and Kondo couplings.  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1098-0121 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000243895100082 Approved no  
  Call Number BT @ hernan @ Serial 53  
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