NDLI: Critical Conductivity Fluctuations of <formula formulatype=inline><tex Notation=TeX>$hbox{YBa}_{2}hbox{Cu}_{2.985}hbox{Fe}_{0.015}hbox{O}_{7-delta}$</tex> </formula> Single Crystal

Content Provider	IEEE Xplore Digital Library
Author	Luiz Hneda, M. das Neves Vieira, V. da Silva Berchon, L. Menegotto Costa, R.
Copyright Year	1965
Abstract	We have studied experimentally the in-plane conductivity fluctuations, Δσ(T), of a YBa₂(Cu_1-xFe_x)₃O_7-δ (x=0.005) single crystal. Different DC magnetic fields (H ≤ 500 Oe) and current densities (J ≤ 209 A/cm^-2) intensities were applied parallel to the CuO₂ (ab) planes at H\|\|J\|\|ab field-current configuration. Close to the superconducting transition, the data reveal the occurrence of a genuine critical regime, where the associated critical exponent is consistent with the predictions of the 3D-XY universality class with model-E dynamics. Decreasing further the temperature towards the transition temperature, T_C, our results systematically show very small exponent values that could be associated to the occurrence of a supercritical regime beyond the 3D-XY scaling. This regime can be interpreted as revealing an ultimate first order character of the superconducting transition driven by antiferromagnetic fluctuations related to the pseudogap phenomenon. The data show that the applied magnetic fields cause an increase in the average exponent related to the supercritical scaling. Unlike the magnetic field, the current density does not affect the supercritical regime. The results indicated that the trivalent Fe doping in YBa₂Cu₃O_7-δ improves the stability of the beyond 3D-XY conductivity fluctuation regime to H ≤ 500 Oe. Also, a further approach towards the first order transition behavior is observed.
Sponsorship	IEEE Magnetics Society
Page Count	5
File Size	765771
Starting Page	4638
Ending Page	4642
File Format	PDF
ISSN	00189464
Volume Number	49
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Conductivity Superconducting magnets Crystals Iron Yttrium barium copper oxide Temperature measurement Current density superconductivity Fluctuations superconducting materials superconducting transition temperature
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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