Phase diagram of YBa₂Cu₃O₇₋y at T<Tc based on Cu(2) transverse nuclear relaxation
Eremin, M. V. · Sakhratov, Yu. A. · Savinkov, A. V. · Dooglav, A. V. · Mukhamedshin, I. R. · Egorov, A. V.
Original · EN
Two maxima in transverse relaxation rate of Cu(2) nuclei in YBa₂Cu₃O₇₋y are observed, at T = 35 K and T = 47 K. Comparison of the ⁶³Cu(2) and ⁶⁵Cu(2) rates at T = 47 K indicates the magnetic character of relaxation. The enhancement at T = 47 K of fluctuating local magnetic fields perpendicular to the CuO₂ planes is connected with the critical fluctuations of orbital currents. Maximum at T = 35 K is connected with the appearance of inhomogeneous supeconducting phase. Together with data published to date, our experimental results allow to suggest a qualitatively new phase diagram of the superconducting phase.
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