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Paramagnetic magnetization signals and curious metastable behaviour in field-cooled magnetization of a single crystal of superconductor 2H-NbSe2

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Kumar, Santosh, Tomy, C. V., Balakrishnan, Geetha, Paul, Don McK. and Grover, A. K. (2015) Paramagnetic magnetization signals and curious metastable behaviour in field-cooled magnetization of a single crystal of superconductor 2H-NbSe2. Journal of Physics: Condensed Matter, 27 (29). 295701. doi:10.1088/0953-8984/27/29/295701

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Official URL: http://dx.doi.org/10.1088/0953-8984/27/29/295701

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Abstract

We present here some newer characteristics pertaining to paramagnetic Meissner effect like response in a single crystal of the low Tc superconducting compound 2H-NbSe2 via a detailed study of effects of perturbation on the field-cooled magnetization response. In the temperature range, where an anomalous paramagnetic magnetization occurs, the field-cooled magnetization response is found to be highly metastable: it displays a curious tendency to switch randomly from a given paramagnetic value to a diamagnetic or to a different paramagnetic value, when the system is perturbed by an impulse of an externally applied ac field. The new facets revealed in a single crystal of 2H-NbSe2 surprisingly bear a marked resemblance with the characteristics of magnetization behaviour anticipated for the giant vortex states with multiple flux quanta (Lphi0, phi0 = hc/2e, L > 1) predicted to occur in mesoscopic-sized superconducting specimen and possible transitions amongst such states.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Superconductors -- Magnetic properties, Paramagnetism, Diamagnetism
Journal or Publication Title: Journal of Physics: Condensed Matter
Publisher: IOP Publishing Ltd
ISSN: 0953-8984
Official Date: 8 July 2015
Dates:
DateEvent
8 July 2015Published
Volume: 27
Number: 29
Article Number: 295701
DOI: 10.1088/0953-8984/27/29/295701
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: IOP Publishing Ltd
Funder: Tata Institute of Fundamental Research, Council of Scientific & Industrial Research (India), Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/I007210/1

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