The Linearly Temperature-Dependent Thermal Conductivity Across the Transition Temperature of Polycrystalline YBa2Cu3O6.9
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Since the discovery of superconducting phenomenon in mercury at 4.2 K by Heike Kamerlingh Onnes in 1911, the research of the superconducting behavior has been prosperous to approach the superconducting transition temperature Tc to higher temperature . The profound K2NiF4-type ceramic, YBa2Cu3O7-δ (YBCO, 0 < δ < 0.5), which possesses a Tc higher than the boiling temperature of liquid nitrogen, make a pronounced expectation for future applications . There have been many reports on the magnetic properties, structural analysis, and materials synthesis [3, 4]. For example, the single- and poly-crystalline YBCO compound could be synthesized by sintering of metal carbonates to control its stoichiometric ratio . Nevertheless, the reports on the thermoelectric performance of superconducting materials are scarce with few reports [6, 7]. Along with recent advances in nano-engineering, thermoelectric materials have attracted much attention due to the potential applications...
The authors want to thank Prof. C. C. Chang in School of Dental Technology, Taipei Medical University for technical support.
This work was supported by the Ministry of Science and Technology, Taiwan (MOST) [grant numbers 105-2622-E-008-002-CC2].
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Conflict of Interest
The authors declare that they have no competing interests.