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arXiv 0812.1696cond-mat.str-elcond-mat.supr-con
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多带超导体中压力引起的FFLO不稳定性

Pressure induced FFLO instability in multi-band superconductors

Igor T. Padilha, Mucio A. Continentino

摘要:

金属间化合物和重费米子化合物等多能带系统在费米面上存在不同轨道的准粒子。由于这些准粒子具有不同的质量或密度,因此与不同轨道相关的费米波矢自然不匹配。这使得这些材料成为观察奇异超导相的潜在候选者,即使在没有外部磁场的情况下也是如此。费米面上共存的不同轨道通常是杂化的,它们的混合程度可以通过外部压力来控制。在这篇文章中,我们研究了杂化控制的两带BCS超导体中FFLO相的存在。在零温度下,随着杂化(压力)的增加,我们发现BCS态变得不稳定,相对于一个单一的波矢q特征的非均匀超导态。

英文摘要:

Multi-band systems as intermetallic and heavy fermion compounds have quasi-particles arising from different orbitals at their Fermi surface. Since these quasi-particles have different masses or densities, there is a natural mismatch of the Fermi wave-vectors associated with different orbitals. This makes these materials potential candidates to observe exotic superconducting phases as Sarma or FFLO phases, even in the absence of an external magnetic field. The distinct orbitals coexisting at the Fermi surface are generally hybridized and their degree of mixing can be controlled by external pressure. In this Communication we investigate the existence of an FFLO phase in a two-band BCS superconductor controlled by hybridization. At zero temperature, as hybridization (pressure) increases we find that the BCS state becomes unstable with respect to an inhomogeneous superconducting state characterized by a single wave-vector q.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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