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Universal Dispersive Excitations in the High-Temperature Superconductors

Christensen, NB; McMorrow, DF; Ronnow, HM; Lake, B; Hayden, SM; Aeppli, G; Perring, TG; (2004) Universal Dispersive Excitations in the High-Temperature Superconductors. 10.1103/PhysRevLett.93.147002.

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High-resolution neutron scattering experiments on optimally doped La$_{2-x}$Sr$_x$CuO$_4$ have been performed which reveal that the magnetic excitations are dispersive. The dispersion is found to be the same as in the YBa$_2$Cu$_3$O$_{6+x}$ family, and is quantitatively related to that observed with charge sensitive probes. The excitations are also found to broaden rapidly with increasing energy, forming a continuum at higher energy, and bear a remarkable resemblance to multi-particle excitations observed in low-dimensional antiferromagnets and some magnetic metals. The magnetic correlations are two dimensional, and so rule out the simplest scenarios where the copper oxide planes are subdivided into weakly interacting one-dimensional magnets.

Type: Article
Title: Universal Dispersive Excitations in the High-Temperature Superconductors
DOI: 10.1103/PhysRevLett.93.147002
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.93.147002
Additional information: 4 pages, 4 figures
Keywords: cond-mat.supr-con, cond-mat.supr-con
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/9760
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