Spin gaps in high temperature superconductors

Millis, 1990, 198 Takigawa, 1991, Phys. Rev. B, 42, 243 Itoh, 1992, J. Phys. Soc. Jpn, 61, 1287, 10.1143/JPSJ.61.1287 Itoh, 1993 Pennington, 1991, Phys. Rev. Lett., 66, 381, 10.1103/PhysRevLett.66.381 Walstedt, 1994, Phys. Rev. Lett., 72, 3610, 10.1103/PhysRevLett.72.3610 Walstedt R. E., unpublished. Millis, 1993, Phys. Rev. B, 48, 7183, 10.1103/PhysRevB.48.7183 Altshuler, 1995, Phys. Rev. B, 52, 5563, 10.1103/PhysRevB.52.5563 Ioffe, 1995, Phys. Rev. B, Phys. Rev. B, 51, 16151, 10.1103/PhysRevB.51.16151 Chakravarty, 1988, Phys. Rev. Lett., 60, 1052, 10.1103/PhysRevLett.60.1057 Chakravarty, 1988, Phys. Rev. B, 39, 7443 Chubukov, 1993, Phys. Rev. Lett., 71, 169, 10.1103/PhysRevLett.71.169 Chubukov, 1994, Phys. Rev. B, 49, 11919, 10.1103/PhysRevB.49.11919 Sokol, 1993, Phys. Rev. Lett., 71, 2813, 10.1103/PhysRevLett.71.2813 Barzykin, 1994, Phys. Rev. B, 49, 1544, 10.1103/PhysRevB.49.1544 Barzykin V. and Pines D., unpublished Millis, 1994, Phys. Rev. B, 50, 16606, 10.1103/PhysRevB.50.16606 Anderson, 1987, Science, 235, 1196, 10.1126/science.235.4793.1196 Baskaran, 1987, Solid State Commun., 63, 973, 10.1016/0038-1098(87)90642-9 Ioffe, 1989, Phys. Rev. B, 39, 8988, 10.1103/PhysRevB.39.8988 Altshuler, 1994, Phys. Rev. B, 50, 14048, 10.1103/PhysRevB.50.14048 Altshuler, 1995, Phys. Rev. B, 52, 4607, 10.1103/PhysRevB.52.4607 Batlog, 1991, Phys. Rev. B, 42, 37 Randeria, 1992, Phys. Rev. Lett., 69, 2001, 10.1103/PhysRevLett.69.2001 Millis, 1993, Phys. Rev. Lett., 70, 2810, 10.1103/PhysRevLett.70.2810 Nakano, 1994, Phys. Rev. B, 45, 1600 Tranquada, 1989, Phys. Rev. B, 40, 4503, 10.1103/PhysRevB.40.4503 Monien H. and Rice T. M., Proc. 1994 Grenoble conf., to appear in Physica C. Stern R. et al. Phys. Rev. B, in press. Tanamoto, 1992, J. Phys. Soc. Jpn, 61, 1886, 10.1143/JPSJ.61.1886 Altshuler, 1992, Solid State Commun., 82, 253, 10.1016/0038-1098(92)90637-O Altshuler, 1994, JETP Lett., 59, 65 Phys. Rev. B, in press. Ubbens, 1994, Phys. Rev. B, 50, 438, 10.1103/PhysRevB.50.438