High-field superconductivity in alloyed MgB2 thin films -: art. no. 012504

被引：212

作者：

Braccini, V ^{[1
]}

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, RK

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

机构：

[1] Univ Wisconsin, Ctr Appl Superconduct, Madison, WI 53705 USA

[2] Penn State Univ, University Pk, PA 16802 USA

[3] Arizona State Univ, Tempe, AZ 85287 USA

[4] Superconductor Technol Inc, Santa Barbara, CA 93111 USA

[5] Univ Genoa, INFM, LAMIA, I-16146 Genoa, Italy

[6] Univ Naples Federico II, INFM, Coherentia, I-80125 Naples, Italy

[7] INSA, UPS, CNRS, Lab Natl Champs Magnet Pulses, F-31432 Toulouse, France

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.71.012504

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigated the effect of alloying on the upper critical field H-c2 for 12 MgB2 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(perpendicular to)(4.2)approximate to35 T and H-c2(parallel to)(4.2)approximate to51 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(parallel to)(0) may approach the paramagnetic limit of similar to70 T.

引用

页数：4

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