Fluctuation-induced diamagnetism above the superconducting transition in MgB2
J. Mosqueira, M. V. Ramallo, S. R. Currás, C. Torrón, F. Vidal
DOI 10.1103/PhysRevB.65.174522 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The behavior of the superconducting fluctuations in the normal state in MgB2 is studied through measurements of the fluctuation-induced diamagnetism (FD). These experiments show that the superconducting fluctuations in this compound are three dimensional in nature. Moreover, for reduced magnetic fields up to 0.5 the FD is not appreciably affected by nonlocal electrodynamic effects. This last FD behavior is in striking contrast with the one always observed, at equivalent reduced magnetic fields, in all other clean low-temperature metallic superconductors studied until now, but it is similar to the one found in cuprate superconductors. A sharp decrease of the fluctuation effects is observed around ɛ=ln(T/TC)≈0.6, in agreement with recent results obtained in other low-TC and high-TC superconductors. This last result confirms the need of a total-energy cutoff condition to extend the applicability of the Gaussian-Ginzburg-Landau approach to the high reduced-temperature region.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.5 | Pressure not reported | onset |
Similar papers
Superconducting diamagnetic fluctuations in MgB2
similarity 0.97A. Lascialfari et al.
Source status unknown — claims are unverified
Dependence of the flux-creep activation energy on current density and magnetic field for the MgB2 superconductor
similarity 0.96M. J. Qin et al.
Source status unknown — claims are unverified
Strong electron-phonon coupling in superconducting MgB2: A specific heat study
similarity 0.96Ch. Wälti et al.
Source status unknown — claims are unverified
Evidence for Two Superconducting Gaps in MgB2
similarity 0.95X. K. Chen et al.
Source status unknown — claims are unverified
Effect of sample size on the magnetic critical current density in nano-SiC doped MgB2 superconductors
similarity 0.94S. Soltanian et al.
Source status unknown — claims are unverified
Reversible magnetization of the two-band MgB2 superconductor: A phenomenological approach
similarity 0.94M. Eisterer et al.
Source status unknown — claims are unverified