Physics – Condensed Matter – Superconductivity
Scientific paper
2001-03-13
Phys. Rev. Lett. 88, 037002 (2002)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevLett.88.037002
The letter deals with the spin-freezing process observed by means of NMR-NQR relaxation or by muon spin rotation in underdoped cuprate superconductors. This phenomenon, sometimes referred as coexistence of antiferromagnetic and superconducting order parameters, is generally thought to result from randomly distributed magnetic moments related to charge inhomogeneities (possibly stripes) which exhibit slowing down of their fluctuations on cooling below T$_c$ . Instead, we describe the experimental findings as due to fluctuating, vortex-antivortex, orbital currents state coexisting with d-wave superconducting state. A direct explanation of the experimental results, in underdoped Y$_{1-x}$Ca$_x$Ba$_2$Cu$_3$O$_{6.1}$ and La$_{2-x}$Sr$%_x$CuO$_4$, is thus given in terms of freezing of orbital current fluctuations.
Eremin Mikhail
Rigamonti A.
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