New Challenges in Superconductivity: Experimental Advances and Emerging Theories

This volume contains the proceedings of the 2004 University of Miami Workshop on Unconventional Superconductivity. The workshop was the fourth in a series of successful meetings on High-T Superconductivity and C related topics, which took place at the James L. Knight Physics Building on the University of Miami campus in Coral Gables, Florida, in January 1991, 1995, 1999, and 2004. The workshop consisted of two consecutive events: 1. NATO Advanced Research Workshop (ARW) on New Challenges in Superconductivity: Experimental Advances and Emerging Theories, held on January 11-14, 2004; 2. Symposium on Emerging Mechanisms for High Temperature Superconductivity (SEMHTS), held on January 15-16, 2004. It is hard to write a balanced preface to a volume like this one, yet at least we try to offer the reader a taste of what was happening in this workshop. There were close to a hundred scientists from around the world, albeit fewer Russians than we had originally hoped for. Nevertheless, the workshop was very lively and we trust that this is demonstrated in this volume. The workshop included high-quality presentations on state of the art works, yet a key issue, discussed by many, was how homogeneous the cuprates are. STM data, as well as other reports, showed that the cuprate superconductors (SC’s) studied were inhomogeneous, especially in the underdoped regime; while experiments, like ARPES and magnetoresistance have established the existence of a Fermi Surface (FS), at least above some doping level, in the cuprates.

Contributing Authors. Preface. Acknowledgments. 1. Lattice Dynamics and Electron Pairing in High Temperature Superconductors; A. Lazara et al. 2. Direct ARPES and T Enhancement in Compressively Strained LSCO-214 Films; D. Pavuna et al. 3. Full Fermi Surface of High Temperature Superconductor Revealed by Angular Magnetoresistance Oscillations; N.E. Hussey et al. 4. Sum Rules and Energy Scales in BiSrCaCuO; A.F. Santander-Syro et al. 5. Optical Properties of (Pr,Ce)2CuO4; A. Zimmers et al. 6. Tunneling Spectra Near TC in Overdoped Bi2Sr2CaCu2O8+; M. Oda et al. 7. Andreev - Saint James Reflections as a Tool for the Study of Unconventional Superconductors; G. Deutscher 8. Bi2Sr2CaCu2O8+ c-Axis Bicrystal Twist and Cross-Whisker Experiments; R.A. Klemm 9. Nodeless Pairing State in YBa2Cu3O2; D.R. Harshman et al. 10. Nuclear Spin Relaxation and Incommensurate Magnetism in Doped Cuprates; L.P. Gor’kov 11. Antiferromagnetic Vortex Core in HTSC Studied by Spatially-Resolved NMR; K. Kumagai et al. 12. Exploring the Oxygen Order in Hg-1223 and Hg-1201 by 199Hg MAS NMR; R. Stem et al. 13. Two Fluids Formation in the Normal State of High-TC Superconductor; J.S. Kim, Y.W. Park 14. Temperature Dependence of in-Plane Resistivity of YBCO; J.Jung, M.Abdelhadi 15. Measurements of the Doping Effects on the in-Plane Paraconductivity in Cuprate Superconductors; F.Vidal et al. 16. A Possibility of a Phase Fluctuation-Like Effect in HTSC Cuprates; Yu.S. Nechaev 17. Pseudogap Behavior in Underdoped Cuprates; D. Pines 18. Notes on RVB-Vanilla by Anderson et al.; C.M. Varma 19. Enhanced TC Near the Metal/Insulator Transition: a New Perspective on Unconventional Superconducting Materials; M.S. Osofsky, R. J. Soulen, Jr. 20. Electron-Lattice Interaction in HTSC Cuprates ; T. Egami 21. High-TemperatureSuperconductivity of Oxides ; J. D. Dow, D.R. Harshman 22. Bose-Einstein Condensation in a Boson-Fermion Model of Cuprates; T.A. Mamedov, M. de Liano 23. Oxygen-Related Band-Features of the Extended Emery Model for the HTS Cuprates; I. Mrkonjic, S. Barisic 24. Condensation Energy for Spin Fluctuations Mechanism of Pairing in High-T Superconductors; S. Kruchinin 25. Effects of Disorder with Finite Range on the Properties of d-Wave Superconductors; C.T. Rieck et al. 26. SuperconductivitY in the Background of Two-Dimensional Stripe Superstructure; Boris V. Fine 27. Theory for Key Experiments in Cuprate Superconductors; D. Manske et al., 28. Dynamical Spin Susceptibility in Singlet-Correlated Band Model; M.V. Eremin, T. Eremin 29. Stripe-Like Inhomogeneities, Coherence, and the Physics of the High TC Cuprates; J. Ashkenazi 30. Self―Supported Superconductivity in Layered Metalochioronitrides; V.Z. Kresin et al. 31. First Order Superconducting Transition near a Ferromagnetic Quantum Critical Point; D.K. Morr 32. Structures and Superconducting Properties of Sodium Cobalt Oxides; K. Takada et al. 33. Upper Critical Field for Cobalt Oxide Superconductors; M.M. Maska, M. Mierzejewski 34. Disproportionation and Spin Ordering Tendencies in NaxCoO2 at x= 1/3; J. Kunes et al. 35. Interband Scattering in MgB2; R.P.S.M. Lobo et al. 36. Phonon Structure in Point Contact Spectra of MgB2; I.K. Yanson 37. A Theoretical Approach to Design Unconventional Superconductors by Heterocyclic Moiecules; C. Ogretir et al. Subject Index.