National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Probing spatial correlations in the inhomogeneous glassy stae of the cuprates by cu nmr.

DE2001783688

Publication Date	2001
Personal Author	Curro, N. J.
Page Count	6
Abstract	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(alpha)(r) ate the functional form E(alpha)(r) for points where E(alpha)(r) is approximately 0.
Keywords	Spatial distribution Cuprates Copper Nuclear magnetic resonance Lanl Glossy behavior
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	46 - Physics
Corporate Authors	Los Alamos National Lab., NM.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200208
Contract Number	W-7405-ENG-36

Probing spatial correlations in the inhomogeneous glassy stae of the cuprates by cu nmr.

Probing spatial correlations in the inhomogeneous glassy stae of the cuprates by cu nmr.
DE2001783688

Publication Date	2001
Personal Author	Curro, N. J.
Page Count	6
Abstract	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(alpha)(r) ate the functional form E(alpha)(r) for points where E(alpha)(r) is approximately 0.
Keywords	Spatial distribution Cuprates Copper Nuclear magnetic resonance Lanl Glossy behavior
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	46 - Physics
Corporate Authors	Los Alamos National Lab., NM.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200208
Contract Number	W-7405-ENG-36