Transport in Ultraclean YBa2Cu3O7: Neither Unitary nor Born Impurity Scattering
Abstract
The thermal conductivity of ultraclean YBa2Cu3O7 was measured at very low temperature in magnetic fields up to 13T. The temperature and field dependence of the electronic heat conductivity show that two widespread assumptions of transport theory applied to unconventional superconductors fail for clean cuprates: impurity scattering cannot be treated in the usual unitary limit (nor indeed in the Born limit), and scattering of quasiparticles off vortices cannot be neglected. Our study also sheds light on the long-standing puzzle of a sudden onset of a “plateau” in the thermal conductivity of Bi-2212 versus field.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 2004
- DOI:
- 10.1103/PhysRevLett.92.027001
- arXiv:
- arXiv:cond-mat/0307360
- Bibcode:
- 2004PhRvL..92b7001H
- Keywords:
-
- 74.25.Fy;
- 72.15.Eb;
- 74.72.Bk;
- Transport properties;
- Electrical and thermal conduction in crystalline metals and alloys;
- Y-based cuprates;
- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 3 figures, submitted to Physical Review Letters