We report the in-plane (ρab) and out-of-plane (ρc) resistivities in the 4 800 Κ range on single crystals of Tl2Ba2CaCu2O8 high-Τc cuprate with Τc = 111 Κ (ρc/ρab ≈ 1000). ρab(Τ) exhibits "usual" linear behavior and ρc(Τ) follows generally metallic-like, positive slope in the 150 400 Κ temperature range. There is a clear crossover to semiconductor-like behavior close to Τc. However, for the first time in a chainless high-Τc cuprate we observe a crossover above 500 Κ due to hopping conduction. Under high pressures (< IS kbar) the magnitude of ρc strongly decreases, yet the ρc(Τ) slope does not change. This suggests that the out-of-plane charge transport is governed by the interplane tunneling rate.
ASJC Scopus subject areas
- Physics and Astronomy(all)