Jha, Rajveer and Awana, V. P. S. (2015) Anomalous Impact of Hydrostatic Pressure on Superconductivity of Polycrystalline LaO0.5F0.5BiSe2. Journal of Superconductivity and Novel Magnetism, 28 (8). 2229-2233 . ISSN 1557-1939

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Abstract

We report bulk superconductivity at 2.5 K in LaO0.5F0.5BiSe2 compound through the DC magnetic susceptibility and electrical resistivity measurements. The synthesized LaO0.5F0.5BiSe2 compound is crystallized in tetragonal structure with space group P4/nmm and Reitveld refined lattice parameters are a = 4.15(1) angstrom and c = 14.02(2) angstrom. The lower critical field of H-c1 = 40 Oe, at temperature 2 K is estimated through the low field magnetization measurements. The LaO0.5F0.5BiSe2 compound showed metallic normal state electrical resistivity with residual resistivity value of 1.35 m Omega cm. The compound is a type-II superconductor, and the estimated H-c2(0) value obtained by WHH formula is above 20 kOe for 90 % rho(n) criteria. The superconducting transition temperature decreases with applied pressure till around 1.68 GPa and with further higher pressures a high-T-c phase emerges with possible onset T-c of above 5 K for 2.5 GPa.

Item Type:	Article
Uncontrolled Keywords:	Bismuth oxyselenide superconductors; Electrical resistivity; Hydrostatic pressure; Magnetic characterization
Subjects:	Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	16 Sep 2016 06:41
Last Modified:	16 Sep 2016 06:41
URI:	http://npl.csircentral.net/id/eprint/1717

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