Doping dependence of the superconducting gap in Tl2Ba2CuO6+delta from heat transport
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
- University of Toronto
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
Original language | English |
---|---|
Article number | 104518 |
Number of pages | 6 |
Journal | Physical review. B |
Volume | 75 |
Issue number | 10 |
Publication status | Published - 30 Mar 2007 |
Peer-reviewed | Yes |
Externally published | Yes |
External IDs
Scopus | 34047188011 |
---|
Keywords
Keywords
- D-WAVE SUPERCONDUCTORS, QUASI-PARTICLE TRANSPORT, THERMAL-CONDUCTIVITY, VORTEX STATE, FERMI-SURFACE, ENERGY GAPS, BI2SR2CACU2O8+DELTA, YBA2CU3O6.9, PSEUDOGAP, CUPRATE