Probing spatial correlations in the inhomogeneous glassy state of the cuprates by Cu NMR.

Conference · Mon Jan 01 00:00:00 EST 2001

DOI:https://doi.org/10.1016/S0022-3697(02)00231-7· OSTI ID:975647

Curro, N J ^[1]

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1. Nicholas J.

We discuss the crossover of the form of the Cu NMR spin echo decay at the onset of Cu wipeout in lanthanum cuprates. Experimentally, the echo decay undergoes a crossover from Gaussian to exponential form below the temperature where the Cu NMR intensity drops. The wipeout and the change in behavior both arise because the nuclei experience spatially inhomogeneous spin fluctuations at low temperatures. We argue that regions where the spin fluctuations remain fast are localized on length scales of order 1-2 lattice spacings. The inhomogeneity is characterized by the local activation energy E{sub a}(r); we estimate the functional form of E{sub a}(r) for points where E{sub a}(r) {approx} 0.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• OSTI ID: 975647
• Report Number(s): LA-UR-01-3969; TRN: US201008%%371
• Resource Relation: Journal Volume: 63; Journal Issue: 12; Conference: Submitted to: Proceedings of the Spectroscopies of Novel Superconductors, 2001 Conference, Chicago, May 13, 2001
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
CUPRATES
DECAY
FLUCTUATIONS
FUNCTIONALS
LANTHANUM
NUCLEI
SPIN
SPIN ECHO
SUPERCONDUCTORS