Kumar, Anuj and Tandon, R. P. and Wang, Jianl and Zeng, Rong and Awana, V. P. S. (2012) Crossing point phenomena (T-star=2.7 K) in specific heat curves of superconducting ferromagnets RuSr2Gd1.4Ce0.6Cu2O10-delta. Journal of Applied Physics , 111 (7). 07E140-07E143. ISSN 0021-8979

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Abstract

Crossing point phenomena are one of the interesting and still puzzling effects in stronglycorrelated electron systems. We have synthesized RuSr2Gd1.4Ce0.6Cu2O10-d(GdRu-1222)magneto-superconductor through the standard solid state reaction route and measured itsmagnetic, transport, and thermal properties. We also synthesized RuSr2Eu1.4Ce0.6Cu2O10-d(EuRu-1222) then measured its heat capacity in zero magnetic fields for reference. The studiedcompounds crystallized in the tetragonal structure with space groupI4/mmm. To explore thecrossing point phenomena, the specific heat [Cp(T)] was investigated in the temperature range1.9-250 K, under magnetic field of up to 70 kOe. Unfortunately though no magnetic andsuperconducting transitions are observed in specific heat, a Schottky-type anomaly is observed atlow temperatures below 20 K. This low temperature Schottky-type anomaly can be attributed tosplitting of the ground state spectroscopic term8S7/2of paramagnetic Gd3þions by both internaland external magnetic fields. It was also observed thatCp(T) is measured for different values ofmagnetic field, possesses the same crossing point (T*¼2.7 K), up to the applied magnetic field 70 kOe.A quantitative explanation of this phenomenon, based on its shape and temperature dependence of theassociated generalized heat capacity (Cp), is presented.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Institute of Physics.
Subjects:	Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	07 Feb 2020 07:52
Last Modified:	07 Feb 2020 07:52
URI:	http://npl.csircentral.net/id/eprint/3660

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