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American Physical Society, Physical Review Letters, 9(107)

DOI: 10.1103/physrevlett.107.096401

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Antiferromagnetic Order in Pauli Limited Unconventional Superconductors

Journal article published in 2011 by Yasuyuki Kato ORCID, C. D. Batista, I. Vekhter ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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.