Doping dependence of the superconducting gap in Tl2Ba2CuO6+delta from heat transport
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
- University of Toronto
- Russian Academy of Sciences
Abstract
We present low-temperature thermal conductivity measurements on the cuprate Tl2Ba2CuO6+delta throughout the overdoped regime. In the T -> 0 limit, the thermal conductivity due to d-wave nodal quasiparticles provides a bulk measurement of the superconducting gap Delta. We find Delta to decrease with increasing doping, with a magnitude consistent with spectroscopic measurements (photoemission and tunneling). This argues for a pure and simple d-wave superconducting state in the overdoped region of the phase diagram, which appears to extend into the underdoped regime down to a hole concentration of similar or equal to 0.1 hole/Cu. As hole concentration is decreased, the gap-to-T-c ratio increases, showing that the suppression of the superconducting transition temperature T-c (relative to the gap) begins in the overdoped regime.
Details
Originalsprache | Englisch |
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Aufsatznummer | 104518 |
Seitenumfang | 6 |
Fachzeitschrift | Physical review. B |
Jahrgang | 75 |
Ausgabenummer | 10 |
Publikationsstatus | Veröffentlicht - 30 März 2007 |
Peer-Review-Status | Ja |
Extern publiziert | Ja |
Externe IDs
Scopus | 34047188011 |
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Schlagworte
Schlagwörter
- D-WAVE SUPERCONDUCTORS, QUASI-PARTICLE TRANSPORT, THERMAL-CONDUCTIVITY, VORTEX STATE, FERMI-SURFACE, ENERGY GAPS, BI2SR2CACU2O8+DELTA, YBA2CU3O6.9, PSEUDOGAP, CUPRATE