Phase diagram of YBa2Cu3O7−y at T<T c according to transverse nuclear relaxation data for Cu(2)
- 1 May 2001
- journal article
- Published by Pleiades Publishing Ltd in JETP Letters
- Vol. 73 (10) , 540-543
- https://doi.org/10.1134/1.1387523
Abstract
Two peaks are observed at T=35 and 47 K in the transverse relaxation rate for Cu(2) nuclei in YBa2Cu3O7−y. A comparison of the relaxation rates for isotopes 63Cu(2) and 65Cu(2) at T=47 K indicates the magnetic nature of relaxation. The enhancement of local magnetic field fluctuations perpendicular to CuO2 planes at T=47 K is associated with critical fluctuations of orbital currents. The peak at T=35 K is attributed to the emergence of an inhomogeneous superconducting phase. The obtained experimental results and the available data from the literature made it possible to propose a qualitatively new phase diagram of the superconducting state.Keywords
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