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Antiferromagnetic Order in Pauli Limited Unconventional Superconductors

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arxiv 1104.0391 v2 pith:SDVXSPRL submitted 2011-04-03 cond-mat.supr-con cond-mat.str-el

Antiferromagnetic Order in Pauli Limited Unconventional Superconductors

Y. Kato , C. D. Batista , I. Vekhter This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords normalcoexistenceorderphasestatesuperconductorsabsenceagreement
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We develop a theory of the coexistence of superconductivity (SC) and antiferromagnetism (AFM) in CeCoIn5. We show that in Pauli-limited nodal superconductors the nesting of the quasi-particle pockets induced by Zeeman pair-breaking leads to incommensurate AFM with the moment normal to the field. We compute the phase diagram and find a first order transition to the normal state at low temperatures, absence of normal state AFM, and coexistence of SC and AFM at high fields, in agreement with experiments. We also predict the existence of a new double-Q magnetic phase.

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