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Hall-effect anomalies near the quantum critical point in CeCu6−xAux

Low Temp. Phys. 35, 544 (2009); doi:10.1063/1.3170930

Issue Date: July 2009

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N. E. Sluchanko, D. N. Sluchanko, and N. A. Samarin
A. M. Prokhorov Institute of General Physics of the Russian Academy of Sciences, ul. Vavilova 38, Moscow 119991, Russia

V. V. Glushkov and S. V. Demishev
A. M. Prokhorov Institute of General Physics of the Russian Academy of Sciences, ul. Vavilova 38, Moscow 119991, Russia; Moscow Institute of Physics and Technology, per. 9, Dolgoprudnyi, Moscow District, 141800, Russia

A. V. Kuznetsov
Moscow Engineering Physics Institute, Kashirskoie shosse 31, Moscow 11549, Russia; A. M. Prokhorov Institute of General Physics of the Russian Academy of Sciences, ul. Vavilova 38, Moscow 119991, Russia

G. S. Burkhanov and O. D. Chistyakov
A. A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow 119991, Russia
The results of Hall-effect and resistance measurements on the substitutional solid solutions CeCu6−xAux with concentrations 0<=x<=0.3, corresponding to a wide neighborhood of the quantum critical point (QCP) at x=0.1, are presented. The measurements are made by rotation of the sample in a constant magnetic field of up to 70  kOe in a temperature interval of 1.8–300  K. For the classic heavy-fermion compound CeCu6 the temperature dependence of the Hall coefficient RH(T) exhibits a complex activational form with activation energies Ea1/kB[approximate]110  K and Ea2/kB[approximate]1.5  K in the temperature intervals 50–300  K and 3–10  K, respectively. It is shown that the anomalous behavior of the Hall effect can be explained in a spin-polaron approach, in which the values Ea1,2 can be associated to the binding energy of many-body and one can obtain estimates of the effective mass (meff1,2[approximate]130–150m0) and localization radius (a<sub>p1,2</sub><sup>*</sup>[approximate]1.7 and 14  Å) of the charge carriers in CeCu6. For the compound CeCu5.9Au0.1, corresponding to the QCP, one observes correlated power-law behavior of the temperature dependence of the Hall coefficient RH(T)~T−0.4 and magnetic susceptibility chi(T)~T−0.4, as is characteristic of the regime of quantum critical behavior. For compounds in the immediate vicinity of the QCP an anomalous, even contribution RH2 to the angular dependence of the Hall voltage appears at temperatures below T*~24  K and becomes stronger with increasing magnetic field. Different scenarios for passage through the QCP and their applicability for describing the Hall-effect anomalies in the substitutional solid solutions CeCu6−xAux are discussed. ©2009 American Institute of Physics
History: Submitted 20 February 2009; revised 31 March 2009
Permalink: http://link.aip.org/link/?LTPHEG/35/544/1
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KEYWORDS and PACS

Keywords
PACS
  • 72.15.Gd
    Galvanomagnetic and other magnetotransport effects (metals/alloys)
  • 64.60.F-
    Equilibrium properties near critical points, critical exponents
  • 71.18.+y
    Fermi surface: calculations and measurements; effective mass, -g factor
  • 71.27.+a
    Strongly correlated electron systems; heavy fermions
  • 71.38.-k
    Polarons and electron-phonon interactions
  • 75.30.Cr
    Saturation moments and magnetic susceptibilities in magnetically ordered materials
  • YEAR: 2009

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