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Anisotropy of the In-Plane and Out-of-Plane Resistivity and the Hall Effect in the Normal State of Vicinal-Grown YBaCuO Thin Films.
Nanomaterials (Basel)
March 2021
Institute of Applied Physics, Johannes-Kepler-University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria.
The resistivity and the Hall effect in the copper-oxide high-temperature superconductor YBa2Cu3O7-δ (YBCO) are remarkably anisotropic. Using a thin film of YBCO grown on an off-axis cut SrTiO3 substrate allows one to investigate these anisotropic transport properties in a planar and well-defined sample geometry employing a homogeneous current density. In the normal state, the Hall voltage probed parallel to the copper-oxide layers is positive and strongly temperature dependent, whereas the out-of-plane Hall voltage is negative and almost temperature independent.
View Article and Find Full Text PDFSimple uniaxial pressure device for ac-susceptibility measurements suitable for closed cycle refrigerator system.
Rev Sci Instrum
June 2007
High Pressure Low Temperature Lab, School of Physics, Bharathidasan University, Tiruchirappalli 620 024, India.
A simple design of the uniaxial pressure device for the measurement of ac-susceptibility at low temperatures using closed cycle refrigerator system is presented for the first time. This device consists of disc micrometer, spring holder attachment, uniaxial pressure cell, and the ac-susceptibility coil wound on stycast bobbin. It can work under pressure till 0.
View Article and Find Full Text PDFSpectral measurement of the Hall angle response in normal state cuprate superconductors.
Phys Rev Lett
July 2002
Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
We measure the temperature and frequency dependence of the complex Hall angle for normal state YBa(2)Cu(3)O(7) films from dc to far-infrared frequencies (20-250 cm(-1)) using a new modulated polarization technique. We determine that the functional dependence of the Hall angle on scattering does not fit the expected Lorentzian response. We find spectral evidence supporting models of the Hall effect where the scattering Gamma(H) is linear in T, suggesting that a single relaxation rate, linear in temperature, governs transport in the cuprates.
View Article and Find Full Text PDFGiant enhancement of the thermal Hall conductivity kappa(xy) in the superconductor YBa(2)Cu(3)O(7).
Phys Rev Lett
January 2001
Joseph Henry Laboratories of Physics, Princeton University, New Jersey 08544, USA.
In high-purity YBa(2)Cu(3)O(7), the (weak-field) thermal Hall conductivity kappa(xy) is observed to increase a thousand-fold between 90 and 30 K. The inferred quasiparticle lifetime tau increases a hundred-fold starting below 90 K, in disagreement with a recent photoemission experiment. We show that kappa(xy) exhibits a specific scaling behavior below approximately 30 K.
View Article and Find Full Text PDFInfrared hall effect in high- T(c) superconductors: evidence for non-fermi-liquid hall scattering.
Phys Rev Lett
April 2000
Center for Superconductivity Research and Department of Physics, University of Maryland, College Park, Maryland 20741, USA.
Infrared ( 20-120 and 900-1100 cm(-1)) Faraday rotation and circular dichroism are measured in high- T(c) superconductors using sensitive polarization modulation techniques. Optimally doped YBa2Cu3O7 thin films are studied at temperatures in the range ( 15
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