Antiferromagnetic Order in Pauli Limited Unconventional Superconductors

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.

References in corpus (7)

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• Valley density-wave and multiband superconductivity in Fe-pnictides
• Observation of Spin Susceptibility Enhancement in the Possible FFLO State in CeCoIn${}_5$
• Pressure Study of Quantum Criticality in CeCoIn5
• Coexistence of SDW, d-wave singlet and staggered $\pi$-triplet superconductivity
• Exploring the fragile antiferromagnetic superconducting phase in CeCoIn5
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• Switching dynamics of the spin density wave in superconducting CeCoIn5
• Impurity-induced magnetic droplet in unconventional superconductors near magnetic instability: Application to Nd doped $\mathbf{CeCoI}{\mathbf{n}}_5$
• Enhancement of Electronic Spin Susceptibility in Pauli Limited Unconventional Superconductors
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• Coupled k-space structure of $d$-wave superconducting and magnetic orders induced by paramagnetic pair-breaking effect
• Strong-coupling approach to antiferromagnetic ordering driven by paramagnetic pair-breaking in d-wave superconducting phase
• Field-induced collective spin-exciton condensation in a quasi-2D dx2-y2-wave heavy electron superconductor
• Distinct domain switching in Nd0.05Ce0.95CoIn5 at low and high fields