Physics – Condensed Matter
Scientific paper
2001-01-23
Phys. Rev. B 63 (2001) 144529
Physics
Condensed Matter
9 pages, REVTEX file (4 Postscript figures). To appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.63.144529
The phase fluctuations of the condensate in doped antiferromagnets, described by a t-t'-J model and a suitable 1/N expansion, provide a mechanism for a Kosterlitz-Thouless (KT) type of transition to a superconducting state below T_{c}. In this paper, we present a Monte Carlo study of the corresponding superfluid weight D_{s}(T) in the classical (large-N) limit, as a function of temperature and doping. Consistent with generic experimental trends, D_{s}(T) exhibits a T-linear decrease at low temperatures, with the magnitude of the slope D_{s}'(0) increasing upon doping. Finite-size scaling in the underdoped regime predicts values for the dimensionless ratio A=k_{B}T_{c}/D_{s}(0) of order unity, with A=0.4435(5) in the half-filled-band limit, thus confirming D_{s}(0) as the fundamental energy scale determining T_{c}. Our Monte Carlo results for D_{s}(T)/D_{s}(0) vs k_{B}T/D_{s}(0), at 10% hole doping, are found to be in reasonable agreement with recent measurements on La_{2-x}Sr_{x}CuO_{4}, with x=0.10, throughout the temperature range below the theoretical KT transition temperature T_{c}.
No associations
LandOfFree
Monte Carlo study of the superfluid weight in doped antiferromagnets 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 Monte Carlo study of the superfluid weight in doped antiferromagnets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Monte Carlo study of the superfluid weight in doped antiferromagnets will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-2588