Kondo-like transport and magnetic field effect of charge carrier fluctuations in granular aluminum oxide thin films

被引：18

作者：

Barone, C. ^{[1
,2
]}

Rotzinger, H. ^{[3
]}

Mauro, C. ^{[1
,2
,4
]}

Dorer, D. ^{[3
]}

Muenzberg, J. ^{[3
]}

Ustinov, A. V. ^{[3
,5
]}

Pagano, S. ^{[1
,2
]}

机构：

[1] Univ Salerno, Dipartimento Fis ER Caianiello, I-84084 Salerno, Italy

[2] Univ Salerno, CNR SPIN Salerno, I-84084 Salerno, Italy

[3] Karlsruhe Inst Technol, Phys Inst, D-76131 Karlsruhe, Germany

[4] Univ Sannio, Dipartimento Ingn, I-82100 Benevento, Italy

[5] Natl Univ Sci & Technol MISIS, Russian Quantum Ctr, Moscow 119049, Russia

来源：

SCIENTIFIC REPORTS | 2018年 / 8卷

关键词：

1/F NOISE;

D O I：

10.1038/s41598-018-32298-1

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Granular aluminum oxide is an attractive material for superconducting quantum electronics. However, its low-temperature normal state transport properties are still not fully understood, while they could be related to the unconventional phenomenon of the superconductivity in this material. In order to obtain useful information on this aspect, a detailed study of charge carrier fluctuations has been performed in granular aluminum oxide films. The results of electric noise measurements indicate the presence of a Kondo-type spin-flip scattering mechanism for the conducting electrons in the normal state, at low temperatures. Moreover, the magnetic field dependence of the noise amplitude suggests that interface magnetic moments are the main source of fluctuations. The identification of the nature of fluctuation processes is a mandatory requirement for the improvement of quality and performance of quantum devices.

引用

页数：10

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