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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.