This article is cited in 5 papers

CONDENSED MATTER

Phase diagram of YBa$_2$Cu$_3$O$_{7-y}$ at $T<T_c$ according to transverse nuclear relaxation data for Cu(2)

M. V. Eremin, Yu. A. Sakhratov, A. V. Savinkov, A. V. Dooglav, I. R. Mukhamedshin, A. V. Egorov

Kazan State University

Abstract: Two peaks are observed at $T=35$ and 47 K in the transverse relaxation rate for Cu(2) nuclei in YBa$_2$Cu$_3$O$_{7-y}$. A comparison of the relaxation rates for isotopes $^{63}$Cu(2) and $^{65}$Cu(2) at $T=47$ K indicates the magnetic nature of relaxation. The enhancement of local magnetic field fluctuations perpendicular to CuO$_2$ 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.

PACS: 74.25.-q, 74.72.Bk, 76.60.Gv

Received: 16.04.2001

 English version: Journal of Experimental and Theoretical Physics Letters, 2001, 73:10, 540–543

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