Quantum Hall effects in layered disordered superconductors.

Physical review letters

PubMedID: 15697845

Kagalovsky V, Horovitz B, Avishai Y. Quantum Hall effects in layered disordered superconductors. Phys Rev Lett. 2004;93(24):246802.
Layered singlet paired superconductors with disorder and broken time reversal symmetry are studied, demonstrating a phase diagram with charge-spin separation in transport. In terms of the average intergrain transmission and the interlayer tunneling we find quantum Hall phases with spin Hall coefficients of sigma(spin)(xy)=0,2 separated by a spin metal phase. We identify a spin metal-insulator localization exponent as well as a spin conductivity exponent of approximately 0.96. In the presence of a Zeeman term an additional sigma(spin)(xy)=1 phase appears.