High-field superconductivity in alloyed MgB 2 thin films

V. Braccini; A. Gurevich; J. E. Giencke; M. C. Jewell; C. B. Eom; D. C. Larbalestier; A. Pogrebnyakov; Y. Cui; B. T. Liu; Y. F. Hu; J. M. Redwing; Qi Li; X. X. Xi; Rakesh Singh; R. Gandikota; J. Kim; B. Wilkens; Nathan Newman; J. Rowell; B. Moeckly; V. Ferrando; C. Tarantini; D. Marré; M. Putti; C. Ferdeghini; R. Vaglio; E. Haanappel

doi:10.1103/PhysRevB.71.012504

High-field superconductivity in alloyed MgB ₂ thin films

V. Braccini, A. Gurevich, J. E. Giencke, M. C. Jewell, C. B. Eom, D. C. Larbalestier, A. Pogrebnyakov, Y. Cui, B. T. Liu, Y. F. Hu, J. M. Redwing, Qi Li, X. X. Xi, Rakesh Singh, R. Gandikota, J. Kim, B. Wilkens, Nathan Newman, J. Rowell, B. MoecklyV. Ferrando, C. Tarantini, D. Marré, M. Putti, C. Ferdeghini, R. Vaglio, E. Haanappel

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Abstract

We investigated the effect of alloying on the upper critical field H _c2 for 12 MgB ₂ films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant H _c2 enhancement in C-alloyed films, and an anomalous upward curvature of H _c2(T). Record high values of H _c2 ^⊥(4.2) ≈ 35 T and H _c2 ^∥(4.2) ≈ 51 T were observed perpendicular and parallel to the ab plane, respectively. The temperature dependence of H _c2(T) is described well by a theory of dirty two-gap superconductivity. Extrapolation of the experimental data to T=0 suggests that H _c2 ^∥(O) may approach the paramagnetic limit of ∼70 T.

Original language	English (US)
Article number	012504
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	71
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.71.012504
State	Published - Jan 2005

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Braccini, V., Gurevich, A., Giencke, J. E., Jewell, M. C., Eom, C. B., Larbalestier, D. C., Pogrebnyakov, A., Cui, Y., Liu, B. T., Hu, Y. F., Redwing, J. M., Li, Q., Xi, X. X., Singh, R., Gandikota, R., Kim, J., Wilkens, B., Newman, N., Rowell, J., ... Haanappel, E. (2005). High-field superconductivity in alloyed MgB ₂ thin films. Physical Review B - Condensed Matter and Materials Physics, 71(1), [012504]. https://doi.org/10.1103/PhysRevB.71.012504

Braccini, V, Gurevich, A, Giencke, JE, Jewell, MC, Eom, CB, Larbalestier, DC, Pogrebnyakov, A, Cui, Y, Liu, BT, Hu, YF, Redwing, JM, Li, Q, Xi, XX, Singh, R, Gandikota, R, Kim, J, Wilkens, B, Newman, N, Rowell, J, Moeckly, B, Ferrando, V, Tarantini, C, Marré, D, Putti, M, Ferdeghini, C, Vaglio, R & Haanappel, E 2005, 'High-field superconductivity in alloyed MgB ₂ thin films', Physical Review B - Condensed Matter and Materials Physics, vol. 71, no. 1, 012504. https://doi.org/10.1103/PhysRevB.71.012504

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abstract = "We investigated the effect of alloying on the upper critical field H c2 for 12 MgB 2 films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant H c2 enhancement in C-alloyed films, and an anomalous upward curvature of H c2(T). Record high values of H c2 ⊥(4.2) ≈ 35 T and H c2 ∥(4.2) ≈ 51 T were observed perpendicular and parallel to the ab plane, respectively. The temperature dependence of H c2(T) is described well by a theory of dirty two-gap superconductivity. Extrapolation of the experimental data to T=0 suggests that H c2 ∥(O) may approach the paramagnetic limit of ∼70 T.",

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AU - Gurevich, A.

AU - Giencke, J. E.

AU - Jewell, M. C.

AU - Eom, C. B.

AU - Larbalestier, D. C.

AU - Pogrebnyakov, A.

AU - Cui, Y.

AU - Liu, B. T.

AU - Hu, Y. F.

AU - Redwing, J. M.

AU - Li, Qi

AU - Xi, X. X.

AU - Singh, Rakesh

AU - Gandikota, R.

AU - Kim, J.

AU - Wilkens, B.

AU - Newman, Nathan

AU - Rowell, J.

AU - Moeckly, B.

AU - Ferrando, V.

AU - Tarantini, C.

AU - Marré, D.

AU - Putti, M.

AU - Ferdeghini, C.

AU - Vaglio, R.

AU - Haanappel, E.

PY - 2005/1

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N2 - We investigated the effect of alloying on the upper critical field H c2 for 12 MgB 2 films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant H c2 enhancement in C-alloyed films, and an anomalous upward curvature of H c2(T). Record high values of H c2 ⊥(4.2) ≈ 35 T and H c2 ∥(4.2) ≈ 51 T were observed perpendicular and parallel to the ab plane, respectively. The temperature dependence of H c2(T) is described well by a theory of dirty two-gap superconductivity. Extrapolation of the experimental data to T=0 suggests that H c2 ∥(O) may approach the paramagnetic limit of ∼70 T.

AB - We investigated the effect of alloying on the upper critical field H c2 for 12 MgB 2 films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant H c2 enhancement in C-alloyed films, and an anomalous upward curvature of H c2(T). Record high values of H c2 ⊥(4.2) ≈ 35 T and H c2 ∥(4.2) ≈ 51 T were observed perpendicular and parallel to the ab plane, respectively. The temperature dependence of H c2(T) is described well by a theory of dirty two-gap superconductivity. Extrapolation of the experimental data to T=0 suggests that H c2 ∥(O) may approach the paramagnetic limit of ∼70 T.

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High-field superconductivity in alloyed MgB ₂ thin films

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