Polaronic behavior in a weak-coupling superconductor

Polaronic discontinuities induced by off-diagonal coupling.

In this paper, we study a form of the Holstein molecular crystal model in which the influence of lattice vibrations on the transfers of electronic excitations between neighboring sites (off-diagonal coupling) is taken into account. Using the Toyozawa Ansatz and the Lanczos algorithm, the Holstein Hamiltonian with two types of off-diagonal coupling is studied focusing on a number of analyticity ...

Weak-localization-like effects in superconductor–ferromagnet–superconductor structures

We report measurements of the resistance as a function of temperature and magnetic field in structures containing a narrow (∼2 μm) ferromagnetic strip connecting two superconducting films. The low-field magnetoresistance has a general appearance similar to that expected for weak localization, but the magnitude is much too large to be accounted for in terms of this mechanism. In zero field the r...

Time-resolved carrier dynamics and electron-phonon coupling strength in proximized weak ferromagnet-superconductor nanobilayers

T. Taneda,1 G. P. Pepe,2 L. Parlato,2 A. A. Golubov,3 and Roman Sobolewski1 1Department of Electrical and Computer Engineering and the Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627-0231, USA 2CNR-INFM Coherentia and Dipartimento Scienze Fisiche, Università di Napoli “Federico II,” Monte Sant’Angelo, I-80125 Napoli, Italy 3Department of Applied Physics, Univ...

Polaronic signatures in the optical properties of the electron-doped cuprate superconductor Nd2–xCexCuO4

Spin-orbital coupling in a triplet superconductor-ferromagnet junction.

We study the interplay of spin and orbital degrees of freedom in a triplet superconductor-ferromagnet junction. Using a self-consistent spatially dependent mean-field theory, we show that increasing the angle between the ferromagnetic moment and the triplet vector order parameter enhances or suppresses the p-wave gap close to the interface, according to whether the gap antinodes are parallel or...