Jha, Rajveer and Rani, Poonam and Awana, V. P. S. (2014) Revisiting Heat Capacity of Bulk Polycrystalline YBa2Cu3O7-delta. Journal of Superconductivity and Novel Magnetism, 27 (2). 287 -291. ISSN 1557-1939

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Abstract

In this letter, we present the superconducting property characterization of a phase pure, reasonably good quality YBa2Cu3O7-delta sample. Studied compound is crystallized in orthorhombic Pmmm space group with lattice parameters a, b, and c being 3.829(2), 3.887(1) and 11.666(3) , respectively. Bulk superconductivity is observed below 90 K as evidenced by resistivity and dc/ac magnetization measurements. The resistivity under magnetic field (rho TH) measurements showed clearly both the intra-grain and inter-grain transitions, which are supplemented by detailed (of varying frequency and amplitude) ac susceptibility studies as well. The upper critical field at 0 K, i.e. H (c2)(0) being determined from rho TH measurements with 50 % criteria of resistivity drop, is similar to 70 T. Studied polycrystalline YBa2Cu3O7-delta is subjected to detailed heat capacity (C (P) ) studies. C (P) exhibited well-defined anomaly at below 90 K, which decreases with applied field. Although the C (P) anomaly/peak at T (c) reduces with applied field, the same is not completely suppressed in high applied fields of up to 12 T. The Sommerfeld constant (gamma) and Debye temperature (I similar to (D)), as determined from low temperature fitting of C (P) (T) data to Sommerfeld-Debye model, are 10.65 mJ/mole-K-2 and 312.3 K, respectively. The results are compared with existing literature on bulk polycrystalline superconducting YBa2Cu3O7-delta sample.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Springer Verlag.
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	04 Nov 2015 07:29
Last Modified:	04 Nov 2015 07:29
URI:	http://npl.csircentral.net/id/eprint/1499

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