Behavior of magnetic ordering and the Kondo effect in the alloys Ce2Rh1−xCoxSi3

Patil, Swapnil ; Iyer, Kartik K. ; Maiti, K. ; Sampathkumaran, E. V. (2008) Behavior of magnetic ordering and the Kondo effect in the alloys Ce2Rh1−xCoxSi3 Physical Review B: Condensed Matter and Materials Physics, 77 (9). 094443_1-094443_6. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v77/i9/e094443

Related URL: http://dx.doi.org/10.1103/PhysRevB.77.094443

Abstract

The results of magnetic susceptibility, electrical resistivity (ρ), and heat-capacity measurements as a function of temperature are reported for the alloys, Ce2Rh1−xCoxSi3, crystallizing in an AlB2-derived hexagonal structure. Ce2RhSi3 exhibits antiferromagnetic ordering at 7 K. The Néel temperature decreases gradually with the increase in Co concentration. For x 0.6, no magnetic ordering is observed down to 0.5 K. Interestingly, the x=0.6 alloy exhibits signatures of non-Fermi-liquid behavior, while the Co end member is a Fermi liquid. Thus, a transformation of magnetic-ordering state to nonmagnetism via non-Fermi-liquid state by isoelectronic chemical doping is evident in this solid solution. The heat-capacity data reveal a dominant role of Kondo compensation in the magnetically ordered state. The electrical resistivity data for x=0.2 and 0.3 alloys show an upturn at respective Nèel temperatures, establishing the formation of a magnetism-induced pseudogap for these intermediate compositions alone as though there is a gradual Fermi surface transformation as the quantum critical point is approached.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:45730
Deposited On:29 Jun 2011 03:33
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