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Author (up) Sereni, J.G.; Gomez Berisso, M.; Canales, N.C.; Deppe, M.; Geibel, C. url  openurl
  Title Tuning ground state degeneracy and quantum criticality in Ce1-xLaxTiGe Type Journal Article
  Year 2010 Publication Physica Status Solidi (B) Basic Research Abbreviated Journal Phys. Status Solidi B Basic Res.  
  Volume 247 Issue 3 Pages 707-709  
  Keywords  
  Abstract We have tuned the paramagnetic heavy Fermion (HF) system CeTiGe to a more magnetic state and toward quantum criticality (QC) by partially substituting La for Ce. The induced volume expansion leads to a pronounced decrease of the Kondo temperature (TK), from ≈50 K in pure CeTiGe to less than 4 K at large La content. Since the former value is of the order of the crystal field splitting, while the latter is well below, the systems evolves from a large degeneracy N = 6 Kondo system at x = 0 to a conventional N = 2 Kondo system at x ≥ 0:8. There, the first excited crystal field doublets become apparent in the T dependence of the specific heat CP(T) at an excitation energy DCF ≈ 30 K. The reduction of the degeneracy is expected to enhance the decrease of TK, explaining the strong reduction by more than one order of magnitude observed in this system. The decrease of TK drives the system toward QC as evidenced by a divergence of CP(T)/T and x(T) toward low temperatures in the x = 0:8 sample. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.  
  Address Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany  
  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 03701972 (ISSN) ISBN Medium  
  Area Expedition Conference  
  Notes Export Date: 1 June 2010; Source: Scopus; doi: 10.1002/pssb.200983029; Language of Original Document: English; Correspondence Address: Sereni, J.G.; Low Temperature Laboratory, Centro Atómico Bariloche (CNEA), 8400 S. C. Bariloche, Argentina; email: jsereni@cab.cnea.gov.ar; References: Löhneysen, H.v., Rosch, A., Vojta, M., Wölfle, P., (2007) Rev. Mod. Phys., 79, p. 1015; Welter, R., Venturini, G., Malamann, B., (1992) J. Alloys Compd, 189, p. 49; Deppe, M., Caroca-Canales, N., Hartmann, S., Oeschler, N., Geibel, C., (2009) J. Phys. Condens. Matter, 21, p. 206001; Deppe, M., Caroca-Canales, N., Sereni, J.G., Geibel, C., (2010) J. Phys.:Condens. Matter, , accepted; Stewart, G.R., (2006) Rev. Mod. Phys., 78, p. 743; Schlottmann, P., (1984) Phys. Rev. B, 30, p. 1454; Desgranges, H.U., Rasul, J.W., (1987) Phys. Rev. B, 36, p. 328 Approved no  
  Call Number BT @ berisso @ Serial 594  
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