Publication

Non-universal behaviour of paraconductivity in YBa2Cu3O7-δ films

Davor Pavuna
1993
Journal Articles

Abstract

The authors analysis of in-plane paraconductivity measurements on YBa2Cu3O7-δ (YBCO) films indicates that short-wavelength cutoff effects are significant even very close to the critical point because of the short coherence length ξ. Consequently, the Aslamazov-Larkin (AL) and Lawrence-Doniach expressions are inapplicable to YBCO in the whole Ginzburg-Landau mean-field region, while a generalized AL expression in three-dimensions, that replaces the conventional AL expression in the case of short ξ, accounts for the data within the experimental error. They conclude that the superconducting state of YBCO is three-dimensional and that the universal AL relation between the critical exponent of paraconductivity and the dimensionality of the superconducting fluctuations is no longer valid in superconductors with sufficiently short ξ

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https://infoscience.epfl.ch/entities/publication/bfd99a86-fa4a-481f-928f-f59f3c8d0bc5

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Davor Pavuna
1993
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/bfd99a86-fa4a-481f-928f-f59f3c8d0bc5

About this result

Related concepts (32)

Critical exponent

Critical exponents describe the behavior of physical quantities near continuous phase transitions. It is believed, though not proven, that they are universal, i.e. they do not depend on the details of the physical system, but only on some of its general features. For instance, for ferromagnetic systems, the critical exponents depend only on: the dimension of the system the range of the interaction the spin dimension These properties of critical exponents are supported by experimental data.

Critical phenomena

In physics, critical phenomena is the collective name associated with the physics of critical points. Most of them stem from the divergence of the correlation length, but also the dynamics slows down. Critical phenomena include scaling relations among different quantities, power-law divergences of some quantities (such as the magnetic susceptibility in the ferromagnetic phase transition) described by critical exponents, universality, fractal behaviour, and ergodicity breaking.

Yttrium barium copper oxide

Yttrium barium copper oxide (YBCO) is a family of crystalline chemical compounds that display high-temperature superconductivity; it includes the first material ever discovered to become superconducting above the boiling point of liquid nitrogen (77 K) at about . Many YBCO compounds have the general formula YBa2Cu3O7−x (also known as Y123), although materials with other Y:Ba:Cu ratios exist, such as YBa2Cu4Oy (Y124) or Y2Ba4Cu7Oy (Y247). At present, there is no singularly recognised theory for high-temperature superconductivity.

Related publications (14)

Non-universal behaviour of paraconductivity in YBa2Cu3O7-δ films

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