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Published May 3, 1993 | Published
Journal Article Open

Vanishing magnetization relaxation in the high field quantum limit in YBa_2Cu_3O_(7-δ)

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

We have investigated the magnetic response of untwinned single crystals of YBa_2Cu_3O_(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 activated 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.

Additional Information

© 1993 The American Physical Society. Received 18 February 1993. We have benefited greatly from discussions with H. M. Jaeger, S. R. Nagel, and G. Vasconcelos. This work was supported by the Science and Technology Center for Superconductivity, NSF DMR91-20000. G.W.C. acknowledges support from the U.S. Department of Energy, Basic Energy Sciences-Materials Science under Contract No. W-31-109-ENG-38. C.S.C. acknowledges support from The Materials Research Laboratory at The University of Chicago, NSF DMR88-19860.

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Published - PhysRevLett.70.2814.pdf

Published - PhysRevLett.73.2276.pdf

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