Emergent Magnetic Degeneracy in Iron Pnictides due to the Interplay between Spin-Orbit Coupling and Quantum Fluctuations

被引:19
作者
Christensen, Morten H. [1 ]
Orth, Peter P. [2 ,3 ]
Andersen, Brian M. [4 ]
Fernandes, Rafael M. [1 ]
机构
[1] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
[3] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA
[4] Univ Copenhagen, Niels Bohr Inst, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
关键词
HIGH-TEMPERATURE SUPERCONDUCTIVITY; ORDER;
D O I
10.1103/PhysRevLett.121.057001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Recent experiments in iron pnictide superconductors reveal that, as the putative magnetic quantum critical point is approached, different types of magnetic order coexist over a narrow region of the phase diagram. Although these magnetic configurations share the same wave vectors, they break distinct symmetries of the lattice. Importantly, the highest superconducting transition temperature takes place close to this proliferation of near-degenerate magnetic states. In this Letter, we employ a renormalization group calculation to show that such a behavior naturally arises due to the effects of spin-orbit coupling on the quantum magnetic fluctuations. Formally, the enhanced magnetic degeneracy near the quantum critical point is manifested as a stable Gaussian fixed point with a large basin of attraction. Implications of our findings to the superconductivity of the iron pnictides are also discussed.
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页数:6
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