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首页> 外文期刊>Physical review >Superconducting Bardeen-Cooper-Schrieffer versus Fulde-Ferrell-Larkin-Ovchinnikov states of heavy quasiparticles with spin-dependent masses and Kondo-type pairing
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Superconducting Bardeen-Cooper-Schrieffer versus Fulde-Ferrell-Larkin-Ovchinnikov states of heavy quasiparticles with spin-dependent masses and Kondo-type pairing

机译:具有自旋相关质量和近藤型配对的重准粒子的超导Bardeen-Cooper-Schrieffer与Fulde-Ferrell-Larkin-Ovchinnikov态

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摘要

The observation of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state and detection of the spin-dependent effective masses (SDM) of quasiparticles in heavy-fermion systems are combined into a single theoretical framework within the (mean-field) Gutzwiller approximation for the correlated states of electrons on a two-dimensional square lattice. The tight-binding approximation with nonzero first two hopping integrals is assumed for the bare electrons. The appearance of the spin-split masses extends essentially the regime of temperatures and applied magnetic fields in which FFLO (of the homogeneous, Fulde-Ferrell form) is stable and thus is claimed to be very important for its detectability. The analysis is performed within the Kondo-lattice limit of the finite- U Anderson-lattice model accounting in a coherent manner for both the mass renormalization (in the Gutzwiller approximation) and real-space pairing among the correlated heavy quasiparticles, the latter driven by the Kondo-type exchange interaction. The results are compared briefly with those obtained recently for a simpler situation of interacting fermion gas treated within a similar scheme. In Appendices A and B the Kondo real-space pairing and the Bogolyubov transformation for the SDM case are detailed.
机译:在重费米子系统中对Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)超导状态的观测和准粒子的自旋相关有效质量(SDM)的检测被组合到(平均场)古兹维勒内的单个理论框架中二维方格上电子的相关态的近似值。对于裸电子,假设前两个跳跃积分的非零紧束缚近似。自旋分裂质量的出现基本上扩展了温度和施加磁场的范围,其中FFLO(均匀的Fulde-Ferrell形式)稳定,因此据称对其可检测性非常重要。该分析是在有限U Anderson格子模型的Kondo格子极限内进行的,以相干的方式对相关重质准粒子之间的质量重整化(按Gutzwiller近似)和实空间配对进行相干,后者由近藤型交流互动。将结果与最近获得的结果进行了简要比较,这些结果是在相似方案中处理相互作用的费米子气体的简单情况。在附录A和附录B中,详细介绍了SDM案例的近藤实空间配对和Bogolyubov变换。

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