Antiferromagnetic ordering induced by paramagnetic depairing in unconventional superconductors

Ryusuke Ikeda; Yuhki Hatakeyama; Kazushi Aoyama

doi:10.1103/PhysRevB.82.060510

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Antiferromagnetic ordering induced by paramagnetic depairing in unconventional superconductors

Ryusuke Ikeda, Yuhki Hatakeyama, Kazushi Aoyama

DOI 10.1103/PhysRevB.82.060510 · Physical Review B

T1

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Abstract

Antiferromagnetic (AFM) (or spin-density wave) quantum critical fluctuation enhanced just below Hc2(0) have been often observed in d-wave superconductors with a strong Pauli paramagnetic depairing (PD) including CeCoIn5. It is shown here that such a tendency of field-induced AFM ordering is a consequence of strong PD and should appear particularly in superconductors with a gap node along the AFM modulation. Two phenomena seen in CeCoIn5, the AFM order in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and the anomalous vortex lattice form factor in the high-field range below the FFLO state, are explained based on this peculiar PD effect.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown