No abstract

We have investigated the influence of Landau quantization both on the field and temperature dependence of some properties of singlet and triplet type4 superconductors. In particular, we consider a multichannel structure of the superconducting gap function, oscillations of the critical temperature with increasing magnetic field and a possible reentrance of superconductivity. In addition, de Haas-van Alphen-like oscillations of the specific heat and its jumps at the critical temperatures have also been analyzed.

Properties of tunneling conductance spectra of a ferromagnetic-insulator-anisotropic spin triplet superconductor junction are theoretically investigated. The Andreev reflection and transmission of quasiparticles at the interfaces, parallel to the c-axis of the superconductor 2 4 Sr RuO , for unitary p-wave and nonunitary states are discussed. Asymmetry of the Andreev reflection amplitude with respect to the boundary normal is analyzed. Discussion of the resonance peak in this reflection is also performed. The essential influence of the magnitude and direction of the exchange field on the conduction spectrum is investigated.

The coherent spin polarized transport in ferromagnet/superconductor/ferromagnet double barrier junctions is analyzed. Using the Bogolubov-de Gennes equation with appropriate boundary conditions, we calculate probabilities of spin dependent transport processes in the ferromagnet/superconductor/ferromagnet junction. In particular, we discuss the nonlocal processes such as the crossed Andreev reflection and elastic co-tunneling. These processes contribute to tunneling a current when the distance between the two magnetic electrodes is comparable to the superconducting coherence length. The dependences of the tunneling transport processes on the strength of the exchange field in the ferromagnetic electrodes, and on the height of the tunnel barriers are presented.