Experimental evidence of the decoupling line in (Bi1.64Pb0.36)Sr2(Ca0.79Y0.21)Cu2O8+δ single crystals by resistivity measurements
Abstract
Both in-plane (ρab) and out-of-plane (ρc) resistivity measurements have been carried out on (Bi1.64Pb0.36)Sr2(Ca0.79Y0.21)Cu2O8+δ single crystals with magnetic field applied along the c-axis direction. Studying the temperature dependence of the resistivity ratio ρab/ρc, we identify at high temperature a pancake phase with the signature proposed by Koshelev. At lower temperature, we observe a thermally activated behavior which can be interpreted easily in the framework of a three-dimensional vortex loops model. We found that the high-temperature limit of the thermally activated behavior corresponds to the low-temperature limit of the Koshelev's prediction. This latter is also characterized by an onset of the in-plane resistivity drop. Consequently, our data suggest that this line is a dimensional crossover which describes the decoupling of the liquid state into a decoupled pancake state.
- Publication:
-
Physical Review B
- Pub Date:
- May 2001
- DOI:
- 10.1103/PhysRevB.63.184504
- Bibcode:
- 2001PhRvB..63r4504T
- Keywords:
-
- 74.60.Ec;
- 74.25.Fy;
- 74.72.Hs;
- Transport properties;
- Bi-based cuprates