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      Angle Dependence of the Transverse Thermal Conductivity in YBa\(_2\)Cu\(_3\)O\(_7\) single crystals: Doppler Effect vs. Andreev scattering

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          Abstract

          We have measured the transverse thermal conductivity \(\kappa_{xy}\) of twinned and untwinned YBa\(_2\)Cu\(_3\)O\(_7\) single crystals as a function of angle \(\theta\) between the magnetic field applied parallel to the CuO\(_2\) planes and the heat current direction, at different magnetic fields and temperatures. For both crystals we observed a clear twofold variation in the field-angle dependence of \(\kappa_{xy}(\theta) = - \kappa^0_{xy}(T,B) \sin(2\theta)\). We have found that the oscillation amplitude \(\kappa^0_{xy}\) depends on temperature and magnetic field. Our results show that \(\kappa^0_{xy} = a B \ln(1/(bB))\) with the temperature- and sample-dependent parameters \(a\) and \(b\). We discuss our results in terms of Andreev scattering of quasiparticles by vortices and a recently proposed theory based on the Doppler shift in the quasiparticle spectrum.

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          Author and article information

          Journal
          2001-04-18
          Article
          10.1103/PhysRevLett.87.167006
          cond-mat/0104326
          34b6fe2a-a021-4ec3-9685-03b6c48e28b8
          History
          Custom metadata
          Phys. Rev. Lett. 87, 167006-1 (2001)
          5 pages, 4 figures
          cond-mat.supr-con

          Condensed matter
          Condensed matter

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