Quasiparticle contribution to heat carriers relaxation time in DyBa${}_2$Cu${}_3$O${}_{7-x}$ from heat diffusivity measurements

Abstract

It is shown that the controversy on phonons or electrons being the most influenced heat carriers below the critical temperature of high-T${}_c$ superconductors can be resolved. Electrical and thermal properties of the same DyBa${}_2$Cu${}_3$O${}_{7-x}$ monodomain have been measured for two highly different oxygenation levels. While the oxygenated sample DyBa${}_2$Cu${}_3$O${}_7$ has very good superconducting properties ($T_c=90$ K), the DyBa${}_2$Cu${}_3$O${}_{6.3}$ sample exhibits an insulator behavior. A careful comparison between measurements of the {\bf thermal diffusivity} of both samples allows us to extract the electronic contribution. This contribution to the relaxation time of heat carriers is shown to be large below $T_c$ and more sensitive to the superconducting state than the phonon contribution.

arXiv comment13 pages, 6 figures

References in corpus (3)

• Giant enhancement of the thermal Hall conductivity κ_{xy} in the superconductor YBa_2Cu_3O_7
• Separation of Quasiparticle and Phononic Heat Currents in YBCO
• Using Corbino disk sample geometry to separate quasiparticle and vortex motion contributions to the mixed state dissipation of YBCO

Cited by in corpus (1)

• Influence of a low magnetic field on the thermal diffusivity of Bi-2212