ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Studies of the magnetic dynamics of La2−xSrxCuO4 have been carried out with particular emphasis on a sample with x=0.14 that becomes superconducting at Tc=33 K. This material exhibits incommensurate peaks in the inelastic magnetic neutron scattering with the same geometry as found for a metallic (but not superconducting) sample with x=0.075. In both cases the peak in χ‘(Q,ω) is shifted from the commensurate position, (π,π) (in the notation of the square lattice of the CuO2 planes), to (π,π)±δ(π,0) and (π,π)±δ(0,π). The magnitude of the incommensuration, δ, increases with doping, x, as δ≈2x. As the temperature is decreased below 100 K the peaks become sharper in Q space and more intense at low frequencies. This development is interrupted by the superconducting transition which suppresses the fluctuations at low frequencies (below about 6 meV). The loss of low frequency magnetic fluctuations is uniform over the region of reciprocal space where the response is present in the normal state.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.352637
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