Absence of residual quasiparticle conductivity in the underdoped cuprate YBa2Cu4O8 |
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Authors: | Hussey N E Nakamae S Behnia K Takagi H Urano C Adachi S Tajima S |
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Affiliation: | Department of Physics, Loughborough University, Loughborough LE11 3TU, United Kingdom. |
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Abstract: | We report measurements of the in-plane thermal conductivity kappa of the stoichiometric underdoped cuprate YBa2Cu4O8 (Y124) below 1 K. kappa(T) is shown to follow a simple phononic T3 dependence at the lowest temperature T for both current directions, with a negligible linear quasiparticle contribution. This observation is in marked contrast with behavior reported in optimally doped cuprates, and implies that extended zero-energy (or low-energy) quasiparticles are absent in Y124. |
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