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Journal Article

Gap Function with Point Nodes in Borocarbide Superconductor YNi2B2C

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Thalmeier,  P.
Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Maki,  K.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Izawa, K., Kamata, K., Nakajima, Y., Matsuda, Y., Watanabe, T., Nohara, M., et al. (2002). Gap Function with Point Nodes in Borocarbide Superconductor YNi2B2C. Physical Review Letters, 89(13): 137006, pp. 137006-137006. doi:10.1103/PhysRevLett.89.137006.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-30FF-5
Abstract
To determine the superconducting gap function of YNi2B2C, the c-axis thermal conductivity kappa(zz) was measured in H rotated in various directions. The angular variation of kappa(zz) in H rotated within the ab plane shows a peculiar fourfold oscillation with narrow cusps. The amplitude of this fourfold oscillation becomes very small when H is rotated conically around the c axis with a tilt angle of 45degrees. These results provide the first compelling evidence that the gap function has point nodes located along the a and b axes. This unprecedented gap structure challenges the current view on the pairing mechanism.