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Quantum effects on the competition between antiferromagnetism and superconductivity in heavy-fermion systems

机译:量子对重费米子系统中反铁磁与超导之间竞争的影响

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摘要

We study a Ginzburg-Landau theory of two coupled fields describing superconductivity and antiferromagnetism in a metal. A coupling between the two-components superconductor and the antiferromagnetic (AF) field is included in the classical action. The classical results are improved calculating the quantum corrections to one-loop order with the method of the effective potential near the AF phase, but in the paramagnetic side. We discuss the influence of these corrections, including the possibility of fluctuation induced first order transitions. A scaling approach is used to obtain the critical and shift exponents at a quantum bicritical point.
机译:我们研究了描述金属中超导性和反铁磁性的两个耦合场的Ginzburg-Landau理论。经典动作中包括两部分超导体和反铁磁(AF)场之间的耦合。通过在AF相位附近但在顺磁侧使用有效电势的方法将量子校正计算为单环阶数,可以改善经典结果。我们讨论了这些校正的影响,包括波动引起的一阶跃迁的可能性。使用缩放方法来获得量子双临界点的临界和位移指数。

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