Physics – Condensed Matter – Superconductivity
Scientific paper
2000-03-29
Phys. Rev. B 62, 9148 (2000)
Physics
Condensed Matter
Superconductivity
7 pages, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.62.9148
Neutron scattering experiments reveal that a diagonal spin modulation, which is a one-dimensional modulation rotated away by 45$^\circ$ from that in the superconducting phase, occurs universally across the insulating spin-glass phase in La$_{2-x}$Sr$_x$CuO$_4$ (0.02$\le x\le$0.055). This establishes an intimate relation between the magnetism and the transport properties in the high-temperature copper oxide superconductors. Furthermore, it is found that the charge density per unit length estimated using a charge stripe model is almost constant throughout the phase diagram, even when the modulation rotates away by 45$^\circ$ at the superconducting boundary. However, at the lowest values for $x$ the density changes approaching 1 hole/Cu as in La$_{2-x}$Sr$_x$NiO$_4$. Magnetic excitation spectra suggest that magnetic correlations change from incommensurate to commensurate at $\omega\sim$7 meV and $T\sim$70 K, indicating a characteristic energy for the incommensurate structure of 6-7 meV.
Birgeneau Robert J.
Endoh Yasuo
Fujita Masaki
Hiraka Haruhiro
Kastner Marc A.
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