Electronic model for CoO2 layer based systems: chiral resonating valence bond metal and superconductivity.
作者： G. Baskaran
DOI: 10.1103/PHYSREVLETT.91.097003
关键词: Materials science 、 Resonating valence bond theory 、 Hexagonal lattice 、 Condensed matter physics 、 Superconductivity 、 Antiferromagnetism 、 Mott insulator 、 Ferromagnetism 、 Dopant 、 Valence bond theory
摘要: Takada et al. have reported superconductivity in layered Na(x)CoO(2)yH(2)O (T(c) approximately equal to 5 K). We model a reference neutral CoO2 layer as an orbitally nondegenerate spin-1/2 antiferromagnetic Mott insulator on triangular lattice and electron doped insulators described by t-J model. It is suggested that at optimal doping chiral spin fluctuations enhanced the dopant dynamics lead gapful d-wave superconducting state. A resonating valence bond (RVB) metal, parity time (PT) reversal violating state with condensed RVB gauge fields, possible weak ferromagnetism, low temperature p-wave are also higher dopings.
arxiv.org
harvard.edu
arxiv-vanity.com参考文章(28)
R. Ray, A. Ghoshray, K. Ghoshray, S. Nakamura, 59 Co NMR studies of metallic NaCo 2 O 4 Physical Review B. ,vol. 59, pp. 9454- 9461 ,(1999) , 10.1103/PHYSREVB.59.9454
G. Baskaran, Principle of valence bond amplitude maximization in cuprates: Superconductivity and spin and charge ordering Physical Review B. ,vol. 64, pp. 092508- ,(2001) , 10.1103/PHYSREVB.64.092508
Hiroshi Kontani, Hiori Kino, Phase diagram of superconductivity on the anisotropic triangular lattice Hubbard model : An effective model of κ-(BEDT-TTF) salts Journal of the Physical Society of Japan. ,vol. 67, pp. 3691- 3694 ,(1998) , 10.1143/JPSJ.67.3691
P. B. Wiegmann, Parity violation and superconductivity in two-dimensional correlated electronic systems. Physical Review Letters. ,vol. 65, pp. 2070- 2073 ,(1990) , 10.1103/PHYSREVLETT.65.2070
G. Baskaran, P. W. Anderson, Gauge theory of high-temperature superconductors and strongly correlated Fermi systems. Physical Review B. ,vol. 37, pp. 580- 583 ,(1988) , 10.1103/PHYSREVB.37.580
PW Anderson, K Horigane, N Takeshita, CH Lee, The resonating valence bond state in La2CuO4 and superconductivity Science. ,vol. 235, pp. 1196- 1198 ,(1987) , 10.1126/SCIENCE.235.4793.1196
R. B. Laughlin, Z. Zou, Properties of the chiral-spin-liquid state. Physical Review B. ,vol. 41, pp. 664- 687 ,(1990) , 10.1103/PHYSREVB.41.664
Ichiro Tsukada, Tsuyoshi Yamamoto, Mikio Takagi, Takashi Tsubone, Susumu Konno, Kunimitsu Uchinokura, Ferromagnetism and Large Negative Magnetoresistance in Pb Doped Bi–Sr–Co–O Misfit-Layer Compound Journal of the Physical Society of Japan. ,vol. 70, pp. 834- 840 ,(2001) , 10.1143/JPSJ.70.834
G Baskaran, Gauge theory of high temperature superconductivity Physica Scripta. ,vol. 1989, pp. 53- 59 ,(1989) , 10.1088/0031-8949/1989/T27/006
Jörg Schmalian, Pairing due to Spin Fluctuations in Layered Organic Superconductors Physical Review Letters. ,vol. 81, pp. 4232- 4235 ,(1998) , 10.1103/PHYSREVLETT.81.4232