Enhancement and suppression of the transition temperature of a three-dimensional XY ferromagnet by control of vortex-loop fugacity

Journal Article · Thu Nov 01 00:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.8595· OSTI ID:6252909

Shenoy, S R ^[1]

---

1. School of Phyics, University of Hyderabad, Hyderabad 500134, Andhra Pradesh (India)

A previous vortex-loop scaling analysis for the three-dimensional {ital XY} model is extended to include an external loop-segment chemical potential {mu}={lambda}{ital k}{sub {ital B}}{ital T}. The loop fugacity {ital y}{sub 0} is suppressed, {ital y}{sub 0}{r arrow}{ital y}{sub 0}{ital e}{sup {minus}2{pi}{lambda}}, for {lambda}{gt}0, enhancing the transition temperature {ital T}{sub {ital c}}({lambda}), in agreement with the Monte Carlo work of Kohring, Shrock, and Wills. One also gets the suppression of transition temperatures {Tc}({ital e}{sup 2}) of lattice superconductors by electromagnetic charge {ital e}{sup 2}, by mapping onto this loop-fugacity model. A possible approach to superconductor high-{Tc} enhancement, by tailored suppression of topological excitations, is briefly conjectured.

• OSTI ID: 6252909
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 42:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
FERROMAGNETIC MATERIALS
TRANSITION TEMPERATURE
HIGH-TC SUPERCONDUCTORS
CRYSTAL LATTICES
MAGNETIC FLUX
SCALING LAWS
CRYSTAL STRUCTURE
MAGNETIC MATERIALS
MATERIALS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
656100 - Condensed Matter Physics- Superconductivity