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The thermal conductivity of ultraclean YBa$_2$Cu$_3$O$_7$ was measured atvery low temperature in magnetic fields up to 13 T. The temperature and fielddependence of the electronic heat conductivity show that two widespreadassumptions of transport theory applied to unconventional superconductors failfor clean cuprates: impurity scattering cannot be treated in the usual unitarylimit (nor indeed in the Born limit), and scattering of quasiparticles offvortices cannot be neglected. Our study also sheds light on the long-standingpuzzle of a sudden onset of a "plateau" in the thermal conductivity of Bi-2212versus field.Comment: 5 pages, 3 figures, submitted to Physical Review Letter

physical review letters

Transport in Ultraclean<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi><mml:mi mathvariant="normal">B</mml:mi><mml:mi mathvariant="normal">a</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">u</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:…

Transport in UltracleanYBa2Cu3O7