Doping dependence of fluctuation diamagnetism in high T-c superconductors

Sarkar, Kingshuk and Banerjee, Sumilan and Mukerjee, Subroto and Ramakrishnan, TV (2016) Doping dependence of fluctuation diamagnetism in high T-c superconductors. In: ANNALS OF PHYSICS, 365 . pp. 7-23.

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Abstract

Using a recently proposed Ginzburg-Landau-like lattice free energy functional due to Banerjee et al. (2011) we calculate the fluctuation diamagnetism of high -T-c superconductors as a function of doping, magnetic field and temperature. We analyse the pairing fluctuations above the superconducting transition temperature in the cuprates, ranging from the strong phase fluctuation dominated underdoped limit to the more conventional amplitude fluctuation dominated overdoped regime. We show that a model where the pairing scale increases and the superfluid density decreases with underdoping produces features of the observed magnetization in the pseudogap region, in good qualitative and reasonable quantitative agreement with the experimental data. In particular, we explicitly show that even when the pseudogap has a pairing origin the magnetization actually tracks the superconducting dome instead of the pseudogap temperature, as seen in experiment. We discuss the doping dependence of the `onset' temperature for fluctuation diamagnetism and comment on the role of vortex core -energy jn our model. (C) 2015 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Publication:	ANNALS OF PHYSICS
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Additional Information:	Copy right for this article belongs to the ACADEMIC PRESS INC ELSEVIER SCIENCE, 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
Keywords:	Superconductivity; Cuprates; Pseudogap; Diamagnetism; Fluctuation; Doping
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	02 Apr 2016 10:46
Last Modified:	02 Apr 2016 10:46
URI:	http://eprints.iisc.ac.in/id/eprint/53482

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