Soft phonons and structural phase transition in superconducting Ba0.59K0.41BiO3

Casimir energy and the superconducting phase transition

We study the influence of Casimir energy on the critical field of a superconducting film, and we show that by this means it might be possible to directly measure, for the first time, the variation of Casimir energy that accompanies the superconducting transition. It is shown that this novel approach may also help clarifying the long-standing controversy on the contribution of TE zero modes to t...

Role of Phonons in Metal-insulator Phase Transition

The ground state insulating phase of certain transition-metal oxides is associated with a macroscopic crystallographic distortion which doubles the basic unit cell. We show that the microscopic theory (electrons, phonons, and their interactions) leads to a metal-insulator phase transition, and discuss some of the properties of the insulating phase. The new conduction and valence band edges have...

Scaling and Duality in the Superconducting Phase Transition

The renewed interest for critical fluctuations in superconductors is due to the enormous variety of interesting phenomena observed in the last decade. In a zero external field regime, non-classical values of the critical exponents and amplitude ratios were measured. In the observed critical region we have −0.03 < α < 0, ν ≈ 0.67 and A+/A− ≈ 1.065. These values were measured for bulk samples of ...

Superconducting transition and phase diagram of single-crystal MgB2

1 Tunable Superconducting Phase Transition in Metal-Decorated Graphene Sheets

B.M. Kessler, Ç. Ö. Girit, A. Zettl, and V. Bouchiat Department of Physics, University of California at Berkeley, Berkeley, California, 94720 USA Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720 USA Center of Integrated Nanomechanical Systems, Berkeley, California, 94720 USA Department of Physics, University of California at Berkeley, Berkeley, Cal...