p-wave superconductivity in a two-dimensional generalized Hubbard model

被引：12
作者：
Millán, JS
Pérez, LA
Wang, CM
机构：
[1] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
[2] Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico
[3] UNACAR, Fac Ingn, Cd Carmen 24180, Campeche, Mexico
来源：
PHYSICS LETTERS A | 2005年 / 335卷 / 5-6期
关键词：
Hubbard model; pairing symmetry;
D O I：
10.1016/j.physleta.2004.12.080
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this Letter, we consider a two-dimensional Hubbard model that includes a second-neighbor correlated hopping interaction, and we find a triplet p-wave superconducting ground state within the BCS formalism. A small distortion of the square-lattice right angles is introduced in order to break the degeneracy of k(x) +/- k(y) oriented p-wave pairing states. For the strong coupling limit, analytical results are obtained. An analysis of the superconducting critical temperature reveals the existence of an optimal electron density and the gap ratio exhibits a non-BCS behavior. Finally, the particular case of strontium ruthenate is examined. (C) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：505 / 511
页数：7
相关论文
共 29 条
[11]   Ferromagnetism stabilized by lattice distortion at the surface of the p-wave superconductor Sr2RuO4 [J].
Matzdorf, R ;
Fang, Z ;
Ismail ;
Zhang, JD ;
Kimura, T ;
Tokura, Y ;
Terakura, K ;
Plummer, EW .
SCIENCE, 2000, 289 (5480) :746-748
[12]   Ferromagnetic spin fluctuation induced superconductivity in Sr2RuO4 [J].
Mazin, II ;
Singh, DJ .
PHYSICAL REVIEW LETTERS, 1997, 79 (04) :733-736
[13]   SUPERCONDUCTIVITY IN NARROW-BAND SYSTEMS WITH LOCAL NONRETARDED ATTRACTIVE INTERACTIONS [J].
MICNAS, R ;
RANNINGER, J ;
ROBASZKIEWICZ, S .
REVIEWS OF MODERN PHYSICS, 1990, 62 (01) :113-171
[14]   Spin triplet pairing and superconducting states in square lattices [J].
Millán, JS ;
Pérez, LA ;
Wang, CM .
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2004, 408 :259-261
[15]  
Mineev V. P., 1999, INTRO UNCONVENTIONAL, P38
[16]   SELF-CONSISTENT D(X(2)-Y(2)) PAIRING IN A 2-DIMENSIONAL HUBBARD-MODEL [J].
MONTHOUX, P ;
SCALAPINO, DJ .
PHYSICAL REVIEW LETTERS, 1994, 72 (12) :1874-1877
[17]   Anisotropy in the incommensurate spin fluctuations of Sr2RuO4 -: art. no. 174501 [J].
Nagata, T ;
Urata, M ;
Kawano-Furukawa, H ;
Yoshizawa, H ;
Kadowaki, H ;
Dai, PC .
PHYSICAL REVIEW B, 2004, 69 (17) :174501-1
[18]  
NELSON KD, 2004, AM PHYS SOC MARCH M
[19]   Roles of electron correlations in the spin-triplet superconductivity of Sr2RuO4 [J].
Nomura, T ;
Yamada, K .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2002, 71 (08) :1993-2004
[20]   Perturbation theory of spin-triplet superconductivity for Sr2RuO4 [J].
Nomura, T ;
Yamada, K .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2000, 69 (11) :3678-3688
123