Zero-field superconducting phase transition obscured by finite-size effects in thick YBa2Cu3O7-δ films

M. C. Sullivan; D. R. Strachan; T. Frederiksen; R. A. Ott; M. Lilly; C. J. Lobb

doi:10.1103/PhysRevB.69.214524

Zero-field superconducting phase transition obscured by finite-size effects in thick YBa₂Cu₃O_7-δ films

M. C. Sullivan
, D. R. Strachan
, T. Frederiksen
, R. A. Ott
, M. Lilly
, C. J. Lobb

Physics And Astronomy

Producción científica: Article › revisión exhaustiva

7 Citas (Scopus)

Resumen

We report on the normal-superconducting phase transition in thick YBa ₂Cu₃O_7-δ films in zero magnetic field. We find significant finite-size effects at low currents even in our thickest films (d=3200 Å). Using data at higher currents, we can unambiguously find T_c and ¿, and show z=2.1±0.15, as expected for the three-dimensional XY model with diffusive dynamics. The crossover to two-dimensional behavior, seen by other researchers in thinner films (d≤500 Å), obscures the three-dimensional transition in both zero field and the vortex-glass transition in field, leading to incorrect values of T_c (or T_g), v, and z. The finite-size effects, usually ignored in thick films, are an explanation for the wide range of critical exponents found in the literature.

Idioma original	English
Número de artículo	214524
Páginas (desde-hasta)	214524-1-214524-5
Publicación	Physical Review B - Condensed Matter and Materials Physics
Volumen	69
N.º	21
DOI	https://doi.org/10.1103/PhysRevB.69.214524
Estado	Published - jun 2004

Financiación

Financiadores	Número del financiador
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China	0302596
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.69.214524

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abstract = "We report on the normal-superconducting phase transition in thick YBa 2Cu3O7-δ films in zero magnetic field. We find significant finite-size effects at low currents even in our thickest films (d=3200 {\AA}). Using data at higher currents, we can unambiguously find Tc and ¿, and show z=2.1±0.15, as expected for the three-dimensional XY model with diffusive dynamics. The crossover to two-dimensional behavior, seen by other researchers in thinner films (d≤500 {\AA}), obscures the three-dimensional transition in both zero field and the vortex-glass transition in field, leading to incorrect values of Tc (or Tg), v, and z. The finite-size effects, usually ignored in thick films, are an explanation for the wide range of critical exponents found in the literature.",

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AU - Ott, R. A.

AU - Lilly, M.

AU - Lobb, C. J.

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AB - We report on the normal-superconducting phase transition in thick YBa 2Cu3O7-δ films in zero magnetic field. We find significant finite-size effects at low currents even in our thickest films (d=3200 Å). Using data at higher currents, we can unambiguously find Tc and ¿, and show z=2.1±0.15, as expected for the three-dimensional XY model with diffusive dynamics. The crossover to two-dimensional behavior, seen by other researchers in thinner films (d≤500 Å), obscures the three-dimensional transition in both zero field and the vortex-glass transition in field, leading to incorrect values of Tc (or Tg), v, and z. The finite-size effects, usually ignored in thick films, are an explanation for the wide range of critical exponents found in the literature.

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