Paraconductivity of granular Al films at high reduced temperatures and magnetic fields

被引：8

作者：

Sonora, D. ^{[1
]}

Carballeira, C. ^{[1
]}

Ponte, I. J. J. ^{[2
]}

Vidal, F. ^{[1
]}

Grenet, T. ^{[3
,4
]}

Mosqueira, J. ^{[1
]}

机构：

[1] Univ Santiago de Compostela, Quantum Mat & Photon Res Grp, Dept Fis Particulas, E-15782 Santiago De Compostela, Spain

[2] Univ Santiago de Compostela, Unidade Magnetosusceptibilidade, RIAIDT, E-15782 Santiago De Compostela, Spain

[3] CNRS, Inst Neel, BP 166, F-38042 Grenoble 9, France

[4] Univ Joseph Fourier, BP 166, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2019年 / 100卷 / 10期

关键词：

HEAT-CAPACITY MEASUREMENTS; SUPERCONDUCTING FLUCTUATIONS; RESISTIVE TRANSITION; CONDUCTIVITY;

D O I：

10.1103/PhysRevB.100.104509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electrical conductivity induced near the superconducting transition by thermal fluctuations was measured in different granular aluminum films. The seemingly anomalous behavior at high reduced temperatures and magnetic fields is explained by taking into account a total-energy cutoff in the superconducting fluctuation spectrum in both the direct (Aslamazov-Larkin) and the indirect (anomalous Maki-Thompson) contributions to the fluctuation effects. The analysis allowed a reliable determination of the coherence length amplitudes, which resulted to be much larger (20-48 nm) than the grains size (5-10 nm). This suggests that the grains are strongly Josephson-coupled, while the T-c value is still as high as twice the bulk value. These results could contribute to identifying the mechanisms enhancing T-c in these materials.

引用

页数：8

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