Vanishing magnetization relaxation in the high field quantum limit in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">YBa</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>7</mn><mi mathvariant="normal">−</mi><mi mathvariant="normal">δ</mi></mrow></msub></mrow></math>

G. T. Seidler; C. S. Carrillo; T. F. Rosenbaum; U. Welp; G. W. Crabtree; V. M. Vinokur

doi:10.1103/PhysRevLett.70.2814

Vanishing magnetization relaxation in the high field quantum limit in ${YBa}_{2}$ ${Cu}_{3}$ $O_{7 - δ}$

G. T. Seidler, C. S. Carrillo, T. F. Rosenbaum, U. Welp, G. W. Crabtree, and V. M. Vinokur

Phys. Rev. Lett. 70, 2814 – Published 3 May 1993

Abstract

We have investigated the magnetic response of untwinned single crystals of ${YBa}_{2}$ ${Cu}_{3}$ $O_{7 - δ}$ at millikelvin temperatures using a Bi thin film magnetometer of micron dimensions. Below T=0.8 K, the magnetization relaxation rate S crosses over from thermally activiated to quantum behavior. Above a sharply defined and strongly temperature-dependent threshold field, S disappears altogether. In concert with the vanishing magnetization relaxation, discrete steps appear in the magnetic hysteresis B(H), each of which corresponds to the ‘‘stick-slip’’ motion of $10^{3}$ vortices under the magnetometer.

Received 18 February 1993

DOI:https://doi.org/10.1103/PhysRevLett.70.2814

Authors & Affiliations

G. T. Seidler, C. S. Carrillo, and T. F. Rosenbaum

NSF Science and Technology Center for Superconductivity
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637

U. Welp, G. W. Crabtree, and V. M. Vinokur