Numerical simulations of disordered superconductors

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This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The authors carried out Monte Carlo studies of the critical behavior of superfluid {sup 4}He in aerogel. They found the superfluid density exponent increases in the presence of fractal disorder with a value roughly consistent with experimental results. They also addressed the localization of flux lines caused by splayed columnar pins. Using a Sine-Gordon-type of renormalization group study they obtained an analytic form for the critical temperature. They also determined the critical temperature from I-V characteristics obtained from a ... continued below

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8 p.

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Bedell, K.S.; Gubernatis, J.E.; Scalettar, R.T. & Zimanyi, G.T. December 1, 1997.

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Description

This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The authors carried out Monte Carlo studies of the critical behavior of superfluid {sup 4}He in aerogel. They found the superfluid density exponent increases in the presence of fractal disorder with a value roughly consistent with experimental results. They also addressed the localization of flux lines caused by splayed columnar pins. Using a Sine-Gordon-type of renormalization group study they obtained an analytic form for the critical temperature. They also determined the critical temperature from I-V characteristics obtained from a molecular dynamics simulation. The combined studies enabled one to construct the phase diagram as a function of interaction strength, temperature, and disorder. They also employed the recently developed mapping between boson world-lines and the flux motion to use quantum Monte Carlo simulations to analyze localization in the presence of disorder. From measurements of the transverse flux line wandering, they determined the critical ratio of columnar to point disorder strength needed to localize the bosons.

Physical Description

8 p.

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INIS; OSTI as DE98001511

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  • Other Information: PBD: [1997]

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  • Other: DE98001511
  • Report No.: LA-UR--97-3252
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/563278 | External Link
  • Office of Scientific & Technical Information Report Number: 563278
  • Archival Resource Key: ark:/67531/metadc697642

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 20, 2016, 3:03 p.m.

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Bedell, K.S.; Gubernatis, J.E.; Scalettar, R.T. & Zimanyi, G.T. Numerical simulations of disordered superconductors, report, December 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc697642/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.