Critical flux pinning and enhanced upper critical field in magnesium diboride films

Milind Kunchur; Cheng Wu; Daniel Arcos; Boris Ivlev; Eun Mi Choi; Kijoon P. Kim; N. Kang; Sung Ik Lee

doi:10.1103/PhysRevB.68.100503

Critical flux pinning and enhanced upper critical field in magnesium diboride films

Milind Kunchur
, Cheng Wu
, Daniel Arcos
, Boris Ivlev
, Eun Mi Choi
, Kijoon P. Kim
, N. Kang
, Sung Ik Lee

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

We have conducted pulsed transport measurements on c-axis-oriented magnesium diboride films over the entire relevant ranges of magnetic field 0≲H≲H_c2 (where H_c2 is the upper critical field) and current density 0≲j≲j_d (where j_d∼10⁷ A/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 H_c2 (to 17 ± 3T) and raises the depinning current density j_c to within an order of magnitude of j_d. 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.

Original language	English
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	68
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.68.100503
State	Published - 2003
Externally published	Yes

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title = "Critical flux pinning and enhanced upper critical field in magnesium diboride films",

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∼107 A/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.",

author = "Milind Kunchur and Cheng Wu and Daniel Arcos and Boris Ivlev and Choi, \{Eun Mi\} and Kim, \{Kijoon P.\} and N. Kang and Lee, \{Sung Ik\}",

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doi = "10.1103/PhysRevB.68.100503",

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T1 - Critical flux pinning and enhanced upper critical field in magnesium diboride films

AU - Kunchur, Milind

AU - Wu, Cheng

AU - Arcos, Daniel

AU - Ivlev, Boris

AU - Choi, Eun Mi

AU - Kim, Kijoon P.

AU - Kang, N.

AU - Lee, Sung Ik

PY - 2003

Y1 - 2003

N2 - 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∼107 A/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.

AB - 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∼107 A/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.

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DO - 10.1103/PhysRevB.68.100503

M3 - Article

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SN - 1098-0121

VL - 68

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 10

ER -

Critical flux pinning and enhanced upper critical field in magnesium diboride films

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