Possible observation of Leggett-like modes in a coherent two-phase medium

被引:1
|
作者
Tarenkov, V. [1 ]
Krivoruchko, V. [1 ]
Shapovalov, A. [2 ,3 ]
Kalenyuk, A. [2 ]
Zhitlukhina, E. [1 ]
Febvre, P. [4 ]
Belogolovskii, M. [2 ,5 ]
机构
[1] Natl Acad Sci Ukraine, OO Galkin Donetsk Inst Phys & Engn, UA-03028 Kiev, Ukraine
[2] Kyiv Acad Univ, UA-03142 Kiev, Ukraine
[3] Natl Acad Sci Ukraine, GV Kurdyumov Inst Met Phys, UA-03142 Kiev, Ukraine
[4] Univ Savoie Mont Blanc, F-73376 Le Bourget Du Lac, France
[5] Friedrich Schiller Univ Jena, Inst Festkorperphys, D-07743 Jena, Germany
基金
新加坡国家研究基金会;
关键词
Leggett mode; point-contact spectroscopy; Bi-based high-T-c oxides; POINT-CONTACT; SUPERCONDUCTOR; SPECTROSCOPY;
D O I
10.1063/10.0019697
中图分类号
O59 [应用物理学];
学科分类号
摘要
Spontaneous symmetry breaking is a ubiquitous phenomenon in physics responsible for various collective modes. Collective excitations predicted by Leggett in 1966 are specific for multiband superfluids and reflect oscillations of the relative phase of different band components. In this work, we argue that such modes should exist also in a multiphase medium with a coherent Josephson-like coupling between the different superconducting components. Point-contact experiments on superconducting ceramics formed by grains of two bismuth-based superconducting oxides with transition temperatures of about 70 and 100 K made it possible to reveal multiple periodic conductance peaks, which we have attributed to elastic scatterings by a Leggett-like mode inherent in the studied two-phase samples. We believe there should be a large group of superconducting materials where such modes could exist and assert that point-contact spectroscopy is one of the best ways to identify and characterize them.
引用
收藏
页码:855 / 859
页数:5
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