Abstract
Assuming a one-dimensional electron band and examining the free energy difference δF (=F S−F N) for an antiferromagnetic superconductor in the presence of a homogeneous magnetic field H0, it is shown that (i) for temperatureT=0, the spatially varying order parameter Δ Q (having the same period as the antiferromagnetic fieldH Q) and the BCS order parameter Δ coexist when |Δ−H Q≤H 0<Δ+H Q (here, the pairing coupling constant for Δ Q is assumed small), and (ii) forT near the second-order phase transition temperature the coexistence of Δ Q and Δ is always realized whenH 0≠0.
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Y. Suzumura and A. D. S. Nagi,Phys. Rev. B, to appear.
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Work supported in part by a grant from the Natural Sciences and Engineering Research Council of Canada.
On leave of absence from Physics Department, Tohoku University, Sendai, Japan.
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Suzumura, Y., Nagi, A.D.S. Ordered state of one-dimensional antiferromagnetic superconductors in the presence of a homogeneous magnetic field. J Low Temp Phys 46, 397–406 (1982). https://doi.org/10.1007/BF00683907
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DOI: https://doi.org/10.1007/BF00683907