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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4541

Title: Magnetocaloric and magnetotransport properties of R(2)Ni(2)Sn compounds (R = Ce, Nd, Sm, Gd, and Tb)
Authors: KUMAR, P
SINGH, NK
SURESH, KG
NIGAM, AK
Keywords: kondo stannide ce2ni2sn
magnetic phase-diagram
ternary stannide
electrical-resistivity
heat-capacity
nd2ni2sn
magnetoresistance
transition
crystal
gd-5(si2ge2)
Issue Date: 2008
Publisher: AMER PHYSICAL SOC
Citation: PHYSICAL REVIEW B, 77(18), -
Abstract: We report a detailed magnetic, magnetocaloric, and magnetotransport study on R(2)Ni(2)Sn compounds with different rare earths. The magnetic state of these compounds is found to be complex because of the coexistence of ferromagnetic and antiferromagnetic components. These compounds show phenomena such as multiple magnetic transitions, nonsaturation of magnetization, and metamagnetic transitions. Analysis of the zero-field heat capacity data shows that the magnetic entropy is less than the theoretical value, indicating the presence of some moment on Ni. Schottky anomaly is present in the magnetic heat capacity data of Sm(2)Ni(2)Sn. The temperature variation of magnetocaloric effect reflects the magnetization behavior. Tb(2)Ni(2)Sn and to a less extent Gd(2)Ni(2)Sn show oscillatory magnetocaloric effect. The variation of magnetocaloric effect is correlated with the ferromagnetic-antiferromagnetic phase coexistence. The electrical resistivity analysis has shown that the electron-magnon scattering is prominent at low temperature, while phonon scattering modified by the s-d interaction is crucial at high temperatures. The magnetoresistance is very large in Ce(2)Ni(2)Sn and shows a quadratic dependence on the field, implying the role of spin fluctuations in determining the transport behavior. Large magnetoresistance has been observed in other compounds as well.
URI: http://dx.doi.org/10.1103/PhysRevB.77.184411
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4541
http://hdl.handle.net/10054/4541
ISSN: 1098-0121
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