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Antiferromagnetic Order and π-Triplet Pairing in the Fulde–Ferrell–Larkin–Ovchinnikov State
Youichi Yanase1,2,3 and
Manfred Sigrist2
1Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033
2Theoretische Physik, ETH-Honggerberg, 8093 Zurich, Switzerland
3Department of Physics, Niigata University, Ikarashi, Nishi-ku, Niigata 950-2181
(Received July 13, 2009; Accepted September 1, 2009; Published November 10, 2009)
The antiferromagnetic Fulde–Ferrell–Larkin–Ovchinnikov (AFM-FFLO) state of coexisting d-wave FFLO superconductivity and incommensurate AFM order is studied on the basis of Bogoliubov–de Gennes (BdG) equations. We show that the incommensurate AFM order is stabilized in the FFLO state by the appearance of the Andreev bound state localized around the zeros of the FFLO order parameter. The AFM-FFLO state is further enhanced by the induced π-triplet superconductivity (pair density wave). The AFM order occurs in the FFLO state even when it is neither stable in the normal state nor in the BCS state. The order parameters of the AFM order, d-wave superconductivity, and π-triplet pairing are investigated by focusing on their spatial structures. Roles of the spin fluctuations beyond the BdG equations are discussed. Their relevance to the high-field superconducting phase of CeCoIn5 is discussed.
©2009 The Physical Society of Japan
URL:
http://jpsj.ipap.jp/link?JPSJ/78/114715/
DOI: 10.1143/JPSJ.78.114715
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