Spin susceptibility of Andreev bound states

Authors

Benjamin M Rosemeyer, Anton B Vorontsov

Publication

Physical Review B

Abstract

We calculate the electronic spin susceptibility and spin-lattice relaxation rate in a singlet superconductor near a pair-breaking surface, or in a domain wall of the order parameter. We directly link the presence of high-density Andreev bound states in the inhomogeneous region, combined with coherence factors, to the enhancement of the susceptibility above the normal state's value for certain q vectors. Besides the dominant peak at ferromagnetic vector q = 0, we find significant enhancement of antiferromagnetic correlations at vectors q less than or similar to 2k(f), with q along the domain wall in an S-wave superconductor, and across the domain wall in D-wave (nodes along the wall). These features are destroyed by applying a moderate Zeeman field that splits the zero-energy peak. We solve Bogoliubov-de Gennes equations in momentum space and discuss the deviation of our results from the lattice models investigated previously. Large enhancement of the spin-lattice relaxation rate T-1(-1) at the domain wall provides a clear signature of the quasiparticle bound states, and is in good agreement with recent experiment in organic superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2).

Links

 

How is this information collected?

This collection of Montana State authored publications is collected by the Library to highlight the achievements of Montana State researchers and more fully understand the research output of the University. They use a number of resources to pull together as complete a list as possible and understand that there may be publications that are missed. If you note the omission of a current publication or want to know more about the collection and display of this information email Leila Sterman.