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Direct observation and anisotropy of the contribution of gap nodes in the low-temperature specific heat of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml…
The specific heat due to line nodes in the superconducting gap of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}$ has been blurred up to now by magnetic terms of extrinsic origin, even for high-quality crystals. We report the specific heat of a single crystal grown in a noncorrosive ${\mathrm{BaZrO}}_{3}$ crucible, for which paramagnetic terms are reduced …