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APS » Journals » Phys. Rev. B » Volume 64 » Issue 22
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Phys. Rev. B 64, 220501(R) (2001) [4 pages]

Universal thermal conductivity in the vortex state of cuprate superconductors

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M. Franz1 and O. Vafek2
1Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada V6T 1Z1
2Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218

Received 24 July 2001; published 1 November 2001

We formulate an effective low-energy theory for the fermionic excitations in d-wave superconductors in the presence of periodic vortex lattices. These can be modeled by an effective free Dirac Hamiltonian with renormalized velocities and possibly a small mass term. In the presence of random nonmagnetic impurities this will result in universal (i.e., field and disorder strength independent) thermal and spin conductivities with values different from those occurring in the Meissner state.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.220501
DOI:
10.1103/PhysRevB.64.220501
PACS:
74.60.Ec, 74.72.-h
 
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