2007/12/12 by R. Khasanov, А. Shengelaya, A. Shengelaya +4
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.064506
published as Phys. Rev. B 77, 064506 (2008) · 9 pages, 7 figures. Accepted for publication in Phys. Rev. B
arxiv created 2007/12/12 · openalex publication_date 2008/02/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 (\ensuremathλ0^\ensuremath-2) on Tc was reconstructed for temperatures in the range 1.5\phantom\rule0.3em0exK\ensuremath\lesssimTc\ensuremath\lesssim8.0\phantom\rule0.3em0exK. \ensuremathλ0^\ensuremath-2 was found to obey the power law dependence \ensuremathλ0^\ensuremath-2\ensuremath∝Tc3.1(1) which appears to be common for some families of BCS superconductors as, e.g., Al doped MgB2 and high-temperature cuprate superconductors as underdoped YBa2Cu3O_7\ensuremath-\ensuremathδ.