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Journal article
Flux melting in Bi2Sr2CaCu2O8+delta: Incorporating both electromagnetic and Josephson couplings
Physical review. B, v 70(2), 024501
01 Jul 2004
Abstract
Multilevel Monte Carlo simulations of a Bi2Sr2CaCu2O8+delta (BSCCO) system are carried out including both Josephson and electromagnetic couplings for a range of anisotropies. A first-order melting transition of the flux lattice is seen on increasing the temperature and/or the magnetic field. The phase diagram for BSCCO is obtained for different values of the anisotropy parameter gamma. The best fit to the experimental results of Majer [Phys. Rev. Lett. 75, 1166 (1995) ] is obtained for gammaapproximate to250 provided one assumes a temperature dependence lambda(2)(0)/lambda(2)(T)=1-t of the penetration depth with t=T/T-c. Assuming a dependence lambda(2)(0)/lambda(2)(T)=1-t(2) the best fit is obtained for gammaapproximate to450. For finite anisotropy the data are shown to collapse on a straight line when plotted in dimensionless units which shows that the melting transition can be satisfied with a single Lindemann parameter whose value is about 0.3. A different scaling applies to the gamma=infinity case. The energy jump is measured across the transition and for large values of gamma it is found to increase with increasing anisotropy and to decrease with increasing magnetic field. For infinite anisotropy we see a two-dimensional behavior of flux droplets with a transition taking place at a temperature independent of the magnetic field. We also show that for smaller values of anisotropy it is reasonable to replace the electromagnetic coupling with an in-plane interaction represented by a Bessel function of the second kind (K-0), thus justifying our claim in a previous paper.
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Details
- Title
- Flux melting in Bi2Sr2CaCu2O8+delta: Incorporating both electromagnetic and Josephson couplings
- Creators
- S Tyagi - University of PittsburghY Y Goldschmidt - University of Pittsburgh
- Publication Details
- Physical review. B, v 70(2), 024501
- Publisher
- Amer Physical Soc
- Number of pages
- 14
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000222996600061
- Scopus ID
- 2-s2.0-42749099076
- Other Identifier
- 991021864986204721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter