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Correlation between the transition temperature and the superfluid density in BCS superconductor NbB2+x


Khasanov, R; Shengelaya, A; Maisuradze, A; Di Castro, D; Escamilla, R; Keller, H (2008). Correlation between the transition temperature and the superfluid density in BCS superconductor NbB2+x. Physical Review. B, Condensed Matter and Materials Physics, 77(6):064506.

Abstract

The results of the muon-spin rotation experiments on BCS superconductors NbB2+x (x=0.2 and 0.34) are reported. Both samples, studied in the present work, exhibit rather broad transitions to the superconducting state, suggesting a distribution of the volume fractions with different transition temperatures (Tc's). By taking these distributions into account, the dependence of the inverse squared zero-temperature magnetic penetration depth (lambda<sub>0</sub><sup>-2</sup>) on Tc was reconstructed for temperatures in the range 1.5 K<~Tc<~8.0 K. lambda<sub>0</sub><sup>-2</sup> was found to obey the power law dependence lambda<sub>0</sub><sup>-2</sup>[proportional]T<sub>c</sub><sup>3.1(1)</sup> which appears to be common for some families of BCS superconductors as, e.g., Al doped MgB2 and high-temperature cuprate superconductors as underdoped YBa2Cu3O7−delta.

Abstract

The results of the muon-spin rotation experiments on BCS superconductors NbB2+x (x=0.2 and 0.34) are reported. Both samples, studied in the present work, exhibit rather broad transitions to the superconducting state, suggesting a distribution of the volume fractions with different transition temperatures (Tc's). By taking these distributions into account, the dependence of the inverse squared zero-temperature magnetic penetration depth (lambda<sub>0</sub><sup>-2</sup>) on Tc was reconstructed for temperatures in the range 1.5 K<~Tc<~8.0 K. lambda<sub>0</sub><sup>-2</sup> was found to obey the power law dependence lambda<sub>0</sub><sup>-2</sup>[proportional]T<sub>c</sub><sup>3.1(1)</sup> which appears to be common for some families of BCS superconductors as, e.g., Al doped MgB2 and high-temperature cuprate superconductors as underdoped YBa2Cu3O7−delta.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2008
Deposited On:17 Feb 2009 17:01
Last Modified:05 Apr 2016 13:00
Publisher:American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.77.064506
Related URLs:http://arxiv.org/abs/0712.2067

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