Volume 126, Number 5, June 2019
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||08 July 2019|
Interplay between disorder-driven non-Fermi-liquid behavior and magnetism in the Ce0.24La0.76Ge compound
School of Basic Sciences, Indian Institute of Technology Mandi - Mandi 175005, Himachal Pradesh, India
Received: 7 March 2019
Accepted: 7 June 2019
In this work, we investigate the magnetic, heat capacity and electrical transport properties of the Ce0.6La0.4Ge and Ce0.24La0.76Ge compounds. Our results show that two antiferromagnetic transitions (∼ at 4.7 and 2.7 K) exhibited by Ce0.6La0.4Ge are suppressed below 1.8 K for Ce0.24La0.76Ge. Interestingly, for Ce0.24La0.76Ge, susceptibility, heat capacity and electrical resistivity vary with temperature as T0.75, T0.5 and T1.6, respectively. The observation of such anomalous temperature variation suggests the non-Fermi-liquid (NFL) behavior due to the presence of disordered 4f spins due to Ce-site dilution. Under the application of magnetic field, it is noted that a crossover from the NFL to a magnetic state occurs around 2 tesla, where short-range correlations among the spins are prevalent due to the dominance of coupling between the magnetic moments via conduction electrons. Magnetoresistance scaling indicates that the behavior of a disorder-driven NFL state is described by the dynamical mean-field theory of the spin glass quantum critical point.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 71.20.Lp – Intermetallic compounds
© EPLA, 2019
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