Correlation between the transition temperature and the superfluid density in BCS superconductor NbB2+x
R. Khasanov, A. Shengelaya, A. Maisuradze, D. Di Castro, R. Escamilla, H. Keller
DOI 10.1103/PhysRevB.77.064506 · Physical Review B
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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 (λ0−2) on Tc was reconstructed for temperatures in the range 1.5K≲Tc≲8.0K. λ0−2 was found to obey the power law dependence λ0−2∝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 YBa2Cu3O7−δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbB2.34 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.02 | Pressure not reported | unknown |
| NbB2.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.4 | Pressure not reported | unknown |
| Nb0.9B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.2 | Pressure not reported | unknown |
| NbB2.34 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.8 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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