Static and dynamic spin correlations in the spin-glass phase of slightly doped La{sub 2-x}Sr{sub x}CuO{sub 4}
Journal Article
·
· Physical Review B
Neutron-scattering experiments reveal that a diagonal spin modulation, which is a one-dimensional modulation rotated away by 45{sup o} from that in the superconducting phase, occurs universally across the insulating spin-glass phase in La{sub 2-x}Sr{sub x}CuO{sub 4} (0.02{<=}x{le}0.055). This establishes an intimate relation between the magnetism and the transport properties in the high-temperature copper oxide superconductors. Furthermore, it is found that the charge density per unit length estimated using a charge stripe model is almost constant throughout the phase diagram, even when the modulation rotates away by 45{sup o} at the superconducting boundary. However, at the lowest values for x the density changes approaching 1 hole/Cu as in La{sub 2-x}Sr{sub x}NiO{sub 4}. Magnetic excitation spectra suggest that magnetic correlations change from incommensurate to commensurate at {omega}{approx}7 meV and T{approx}70 K, indicating a characteristic energy for the incommensurate structure of 6--7 meV.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205608
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 13 Vol. 62; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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