Critical flux pinning and enhanced upper critical field in magnesium diboride films
Milind N. Kunchur, Cheng Wu, Daniel H. Arcos, Boris I. Ivlev, Eun-Mi Choi, Kijoon H. P. Kim, W. N. Kang, Sung-Ik Lee
DOI 10.1103/PhysRevB.68.100503 · 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
We have conducted pulsed transport measurements on c-axis-oriented magnesium diboride films over the entire relevant ranges of magnetic field 0≲H≲Hc2 (where Hc2 is the upper critical field) and current density 0≲j≲jd (where jd∼107A/cm2 is the depairing current density). The intrinsic disorder of the films combined with the large coherence length and three dimensionality, compared to cuprate superconductors, results in a sixfold enhancement of Hc2 (to 17±3T) and raises the depinning current density jc to within an order of magnitude of jd. The current-voltage response has an unusually steep nonlinear shape at all fields, resulting from a combination of depinning and pair breaking, and has no trace of an Ohmic free-flux-flow regime.
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. | — | Pressure not reported | unknown |
Similar papers
Suppressed flux motion in magnesium diboride films
similarity 0.92Daniel H. Arcos & Milind N. Kunchur
Source status unknown — claims are unverified
Critical flux pinning and enhanced upper-critical-field in magnesium diboride films
similarity 0.91M. N. Kunchur et al. · 2003 · arXiv:cond-mat/0311364
Source status unknown — claims are unverified
Superconducting gap structure and pinning in disordered MgB2 films
similarity 0.91Y. Bugoslavsky et al. · 2003 · arXiv:cond-mat/0309589
Source status unknown — claims are unverified
Resistive transition in granular disordered high Tc superconductors: A numerical study
similarity 0.91L. Ponta et al.
Source status unknown — claims are unverified
Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
similarity 0.91C. B. Eom et al. · 2001 · arXiv:cond-mat/0103425
Source status unknown — claims are unverified
High Current-Carrying Capability in c-Axis-Oriented Superconducting MgB2 Thin Films
similarity 0.90Hyeong-Jin Kim et al.
Source status unknown — claims are unverified