Magnetic behavior of bulk and fine particles of RCr2Si2C (R=La, Ce) compounds: possible magnetic ordering from Cr

Mukherjee, K. ; Iyer, Kartik K. ; Sampathkumaran, E. V. (2010) Magnetic behavior of bulk and fine particles of RCr2Si2C (R=La, Ce) compounds: possible magnetic ordering from Cr Journal of Physics: Condensed Matter, 22 (29). 295603_1- 295603_6. ISSN 0953-8984

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Official URL: http://iopscience.iop.org/0953-8984/22/29/295603

Related URL: http://dx.doi.org/10.1088/0953-8984/22/29/295603

Abstract

The magnetic behavior of the quaternary compounds, RCr2Si2C (R=La, Ce), has been investigated by magnetization (M) and heat-capacity (C) measurements (1.8-300 K) in the bulk polycrystals and nano forms (<1 μm) obtained by high-energy balling. Our finding is that Cr appears to exhibit magnetic ordering of an itinerant type at low temperatures (< 20 K) in the bulk form, as inferred from a combined look at all the data. The magnetic ordering gets gradually suppressed with increasing milling time. Evidence for a mixed-valence state of Ce for the bulk form is obtained from the tendency of magnetic susceptibility to exhibit a maximum above 300 K. However, this feature vanishes in the nano form, which exhibits a Curie-Weiss behavior above 200 K as though Ce tends towards trivalency in these fine particles; in addition, there is a weak upturn in C/T below 10 K in the bulk, which becomes very prominent in the milled Ce-based specimens at lower temperatures, as though heavy-fermion behavior gets stronger in smaller particles.

Item Type:Article
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Deposited On:11 Jul 2011 05:47
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