Anisotropy and Crystallite Misalignment in Textured Superconductors

Magnetic Anisotropy and Exchange in (001) Textured FePt-based Nanostructures

Phase diagram and gap anisotropy in iron-pnictide superconductors

Hiroaki Ikeda,1,* Ryotaro Arita,2,3,4 and Jan Kuneš5,6 1Department of Physics, Kyoto University, Kyoto 606-8502, Japan 2Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan 3TRIP, JST, Sanbancho, Chiyoda, Tokyo 102-0075, Japan 4CREST, JST, Hongo, Tokyo 113-8656, Japan 5Center for Electronic Correlations and Magnetism, Theoretical Physics III, University of Augsburg, 86135 A...

Infrared Studies of Textured Ceramic High-t, Superconductors

The surfaces of ceramic samples of high-temperature superconductors can have a high degree of crystalline orientation, depending of the way in which they are prepared. (In particular it is essential that the sample not be polished in an attempt to “improve” the optical quality.) The surfaces of these textured ceramic samples consist of small crystallites, with about 80% orientation of the cryst...

Anisotropy and magnetism of high temperature oxides superconductors

Phonon or electron mediated weak BCS attraction is enough to have high critical temperature if a van Hove anomaly is at work. This could apply to electron doped compounds and also to compounds with CuO2 planes overdoped in holes, where Tc decreases with increasing doping. If phonons dominate, it should lead to an anisotropic but mainly s superconductive gap, as observed recently in overdoped La...

Paramagnetic Meissner Effect and Strong Time Dependence at High Fields in Melt-Textured High-TC Superconductors

In this work we report on systematic field-cooled magnetization experiments in melt-textured YBa2Cu3O7−δ samples containing Y211 precipitates. Magnetic fields up to 14 T were applied either parallel or perpendicular to the ab planes and a strong paramagnetic response related to the superconducting state was observed. This effect is known as paramagnetic Meissner effect (PME). The magnitude of t...