Paramagnetic magnetization signals and curious metastable behaviour in field-cooled magnetization of a single crystal of superconductor 2H-NbSe2. (29th July 2015)

• Record Type: Journal Article
• Authors: Kumar, Santosh; Tomy, C V; Balakrishnan, G; Paul, D McK; Grover, A K
• Is Part Of: Journal of physics. Volume 27:Number 29(2015)
• Page Start: 1365
• Page End: 132
• Publication Date: 2015-07-29
• Subjects: Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/27/29/295701
• Languages: English
• ISSNs: 0953-8984

Abstract

<abstract> <title>Abstract</title> <p>We present here some newer characteristics pertaining to paramagnetic Meissner effect like response in a single crystal of the low <inline-formula><tex-math><?CDATA ${{T}_{\text{c}}}$ ?></tex-math><?MML <mml:math><mml:mstyle displaystyle='false'><mml:msub><mml:mi>T</mml:mi><mml:mrow><mml:mi mathvariant="normal">c</mml:mi></mml:mrow></mml:msub></mml:mstyle></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj2c93hv18" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> superconducting compound 2H-<inline-formula><tex-math><?CDATA $\text{NbS}{{\text{e}}_{2}}$ ?></tex-math><?MML <mml:math><mml:mstyle displaystyle='false'><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi><mml:mi mathvariant="normal">b</mml:mi><mml:mi mathvariant="normal">S</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mstyle></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj2c93hqsb" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> 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 magnetic field. The new facets revealed in a single crystal of 2H-<inline-formula><tex-math><?CDATA $\text{NbS}{{\text{e}}_{2}}$ ?></tex-math><?MML <mml:math><mml:mstyle displaystyle='false'><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi><mml:mi mathvariant="normal">b</mml:mi><mml:mi mathvariant="normal">S</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mstyle></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj2c93htj1" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> surprisingly bear a marked resemblance with the characteristics of magnetization behaviour anticipated for the giant vortex states with multiple flux quanta (<inline-formula><tex-math><?CDATA $L{{\Phi}_{0}}$ ?></tex-math><?MML <mml:math><mml:mi>L</mml:mi><mml:mstyle displaystyle='false'><mml:msub><mml:mstyle mathvariant='normal'><mml:mi mathvariant="normal">Φ</mml:mi></mml:mstyle><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msub></mml:mstyle></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj2c93hrzm" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula>, <inline-formula><tex-math><?CDATA ${{\Phi}_{0}}=hc/2e$ ?></tex-math><?MML <mml:math><mml:mstyle displaystyle='false'><mml:msub><mml:mstyle mathvariant='normal'><mml:mi mathvariant="normal">Φ</mml:mi></mml:mstyle><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msub></mml:mstyle><mml:mo>=</mml:mo><mml:mi>h</mml:mi><mml:mi>c</mml:mi><mml:mrow><mml:mo>/</mml:mo></mml:mrow><mml:mn>2</mml:mn><mml:mi>e</mml:mi></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj2c93ht29" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula>, <inline-formula><tex-math><?CDATA $L>1$ ?></tex-math><?MML <mml:math><mml:mi>L</mml:mi><mml:mo>></mml:mo><mml:mn>1</mml:mn></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj2c93hvtz" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula>) predicted to occur in mesoscopic-sized superconducting specimen and possible transitions amongst such states.</p> </abstract>