Physics – Condensed Matter – Superconductivity
Scientific paper
1999-12-03
Physics
Condensed Matter
Superconductivity
9 pages, 10 figures, submitted to PRB
Scientific paper
10.1103/PhysRevB.62.631
Angular-dependent magnetic torque measurements performed near the critical temperature on single crystals of HgBa_{2}CuO_{4+y}, La_{2-x}Sr{x}CuO_{4}, and YBa_{2}Cu_{3}O_{6.93} are scaled, following the 3D XY model, in order to determine the scaling function dG^{\pm}(z)/dz which describes the universal critical properties near T_{c}. A systematic shift of the scaling function with increasing effective mass anisotropy \gamma = (m_{ab}*/m_{c}*)^{1/2} is observed, which may be understood in terms of a 3D-2D crossover. Further evidence for a 3D-2D crossover is found from temperature-dependent torque measurements carried out in different magnetic fields at different field orientations \delta, which show a quasi 2D "crossing region'' (M*,T*). The occurrence of this "crossing phenomenon'' is explained in a phenomenological way from the weak z dependence of the scaling function around a value z = z*. The "crossing'' temperature T* is found to be angular-dependent. Torque measurements above T_{c} reveal that fluctuations are strongly enhanced in the underdoped regime where the anisotropy is large, whereas they are less important in the overdoped regime.
Conder Kazimierz
Hofer J.
Karpinski Janusz
Keller Hugo
Kishio Kohji
No associations
LandOfFree
Torque magnetometry on single-crystal high temperature superconductors near the critical temperature: a scaling approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Torque magnetometry on single-crystal high temperature superconductors near the critical temperature: a scaling approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Torque magnetometry on single-crystal high temperature superconductors near the critical temperature: a scaling approach will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-441591