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Inhomogeneous low frequency spin dynamics in La(1.65)Eu(0.2)Sr(0.15)CuO(4)
N J Curro1, P C Hammel, B J Suh
1Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Physical Review Letters
|September 16, 2000
Summary
Nuclear magnetic resonance reveals inhomogeneous glassy spin dynamics in lanthanum cuprates. Slow electronic spin fluctuations cause a distribution of activation energies, a common trait in these materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nuclear Magnetic Resonance Spectroscopy
Background:
- Lanthanum cuprates are a class of materials with complex electronic properties.
- Understanding spin dynamics is crucial for their technological applications.
- Previous studies suggested unusual magnetic behavior in doped lanthanum cuprates.
Purpose of the Study:
- To investigate the spin dynamics in a specific title compound using nuclear magnetic resonance (NMR).
- To elucidate the nature of the observed glassy behavior and its origins.
- To determine if these phenomena are characteristic of doped lanthanum cuprates in general.
Main Methods:
- Utilizing Copper (Cu) and Lanthanum (La) nuclear magnetic resonance (NMR) measurements.
- Analyzing the spin lattice relaxation rate of La.
- Observing the intensity of Cu NMR signals.
Main Results:
- NMR measurements revealed an inhomogeneous glassy behavior in the spin dynamics.
- A low-temperature peak in the La spin lattice relaxation rate was observed.
- A "wipeout" phenomenon in the Cu NMR intensity indicated slow electronic spin fluctuations.
- These fluctuations are associated with a distribution of activation energies.
Conclusions:
- The observed phenomena, including the glassy spin dynamics and slow fluctuations, are attributed to a distribution of activation energies.
- Inhomogeneous slowing of spin fluctuations is identified as a general characteristic of doped lanthanum cuprates.
- The findings provide insights into the complex magnetic properties of these materials.