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J. Phys.: Condens. Matter 12 (2000) 44954502. Printed in the UK PII: S0953-8984(00)11527-9 Disorder and the quantum critical point in UCu5-xPdx
 

Summary: J. Phys.: Condens. Matter 12 (2000) 4495­4502. Printed in the UK PII: S0953-8984(00)11527-9
Disorder and the quantum critical point in UCu5-xPdx
R Chau§, M C Aronson, E J Freeman and M B Maple
Department of Physics and the Institute for Pure and Applied Physical Sciences, University of
California, San Diego, CA 92093, USA
The Harrison M Randall Laboratory of Physics, University of Michigan, Ann Arbor,
MI 48109-1120, USA
Received 2 February 2000
Abstract. We have measured the magnetization of UCu5-xPdx (x = 0.7, 1, 1.5, 2) in fields H
as large as 30 T and for temperatures between 1.4 K and 150 K. A composition- and temperature-
dependent characteristic field H(x, T ) is identified, which separates two different non-Fermi
liquid scaling regimes, present even in zero field. For H H(x, T ), composition-independent
scaling is found, while for H H(x, T ), different exponents are found for each composition.
This second phase is centred in temperature and composition around the x = 1, T = 0 critical
point, and we argue that it is consistent with the presence of a Griffiths phase.
In recent years, it has been discovered that a zero-temperature critical point can be induced in a
variety of metallic magnets by using pressure or compositional variation to suppress magnetic
ordering temperatures to zero. The properties of this novel phase transition have prompted
much experimental and theoretical work [1,2]. The fundamental excitations near such quantum
critical points lead to unusual temperature and energy dependences in measured quantities,

  

Source: Aronson, Meigan - Department of Physics and Astronomy, SUNY at Stony Brook

 

Collections: Materials Science; Physics