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Magnon Bose-Einstein condensation and superconductivity in a frustrated Kondo lattice.
Proceedings of the National Academy of Sciences of the United States of America ( IF 11.1 ) Pub Date : 2020-08-25 , DOI: 10.1073/pnas.2000501117
Pavel A Volkov 1 , Snir Gazit 2, 3 , Jedediah H Pixley 4
Affiliation  

Motivated by recent experiments on magnetically frustrated heavy fermion metals, we theoretically study the phase diagram of the Kondo lattice model with a nonmagnetic valence bond solid ground state on a ladder. A similar physical setting may be naturally occurring in YbAl3C3, CeAgBi2, and TmB4 compounds. In the insulating limit, the application of a magnetic field drives a quantum phase transition to an easy-plane antiferromagnet, which is described by a Bose–Einstein condensation of magnons. Using a combination of field theoretical techniques and density matrix renormalization group calculations we demonstrate that in one dimension this transition is stable in the presence of a metallic Fermi sea, and its universality class in the local magnetic response is unaffected by the itinerant gapless fermions. Moreover, we find that fluctuations about the valence bond solid ground state can mediate an attractive interaction that drives unconventional superconducting correlations. We discuss the extensions of our findings to higher dimensions and argue that depending on the filling of conduction electrons, the magnon Bose–Einstein condensation transition can remain stable in a metal also in dimensions two and three.



中文翻译:

沮丧的Kondo晶格中的Magnon Bose-Einstein凝聚和超导。

受近期对受磁挫重铁金属的实验影响,我们从理论上研究了梯子上具有非磁性价键固态基态的Kondo晶格模型的相图。类似的物理环境可能自然发生在ÿb一种3C3CË一种G一世2Ť4化合物。在绝缘极限内,磁场的施加驱使量子相变到易平面反铁磁体,这由强子的玻色-爱因斯坦凝聚描述。结合使用现场理论技术和密度矩阵重归一化组计算,我们证明了在一个维度上,这种过渡在存在金属费米海的情况下是稳定的,并且其在局部磁响应中的通用性不受迭代无间隙费米子影响。此外,我们发现关于价键固态基态的波动可以介导有吸引力的相互作用,从而驱动非常规超导相关。我们讨论了将研究结果扩展到更高维度的问题,并认为,取决于导电电子的填充,

更新日期:2020-08-26
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