标题： 基于具有时间反演对称性破缺的三带超导体的直流SQUID 显示英文标题

标题： Dc SQUID based on a three-band superconductor with broken time-reversal symmetry

摘要： 基于单带和三带超导体之间存在时间反演对称性破缺的脏点接触的直流SQUID的行为被研究。 利用此类系统中约瑟夫森效应的先前结果，发现了直流SQUID特性中的新特征。 结果显示，在应用外部磁通量可被半整数磁通量整除的情况下，对于具有时间反演对称性破缺的三带超导体，直流SQUID的基态出现强烈的简并。 这可能导致在直流SQUID总磁通量与外加磁通量的关系中出现可能的多滞回环。 这些环的数量取决于三带超导体基态的位置。 此外还发现，临界电流与外加磁通量的关系可能具有复杂的多周期形式，这与常规直流SQUID的严格周期特性以及外磁场中约瑟夫森结的弗劳恩霍夫衍射图样不同。 显示英文摘要

摘要： The behavior of a dc SQUID, based on a dirty point contacts between a single-band and three-band superconductor with broken time-reversal symmetry is investigated. Using earlier obtained results for Josephson effects in such systems new features in characteristics of a dc SQUID are revealed. It is shown that in the case of a BTRS (broken time-reversal symmetry) three-band superconductor for the applied external magnetic flux, which is divisible by the half-integer flux, strong degeneracy of ground states of a dc SQUID is taken place. This can lead to the appearance of possible multi-hysteresis loops on a dependence of a total flux in the dc SQUID from the externally applied flux. The number of these loops depends on the position of ground states of a three-band superconductor. Also it is found that dependencies of a critical current on applied magnetic flux can have complicated multi-periodic forms, which are differ from strictly periodic characteristics for conventional dc SQUIDs and Fraunhofer patterns for Josephson contacts in the external magnetic field.