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Dispersive excitations in the high-temperature superconductor La2-xSrxCuO4

Christensen, NB; McMorrow, DF; Ronnow, HM; Lake, B; Hayden, SM; Aeppli, G; Perring, TG; (2004) Dispersive excitations in the high-temperature superconductor La2-xSrxCuO4. PHYS REV LETT , 93 (14) , Article 147002. 10.1103/PhysRevLett.93.147002. Green open access

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Abstract

High-resolution neutron scattering experiments on optimally doped La2-xSrxCuO4 (x=0.16) reveal that the magnetic excitations are dispersive. The dispersion is the same as in YBa2Cu3O6.85, and is quantitatively related to that observed with charge sensitive probes. The associated velocity in La2-xSrxCuO4 is only weakly dependent on doping with a value close to the spin-wave velocity of the insulating (x=0) parent compound. In contrast with the insulator, the excitations broaden rapidly with increasing energy, forming a continuum at higher energy and bear a remarkable resemblance to multiparticle excitations observed in 1D S=1/2 antiferromagnets. The magnetic correlations are 2D, and so rule out the simplest scenarios where the copper oxide planes are subdivided into weakly interacting 1D magnets.

Type: Article
Title: Dispersive excitations in the high-temperature superconductor La2-xSrxCuO4
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.93.147002
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.93.147002
Language: English
Additional information: The American Physical Society
Keywords: COPPER-OXIDE SUPERCONDUCTORS, NORMAL-STATE, T-C, SPIN, STRIPES, BI2SR2CACU2O8+DELTA, FLUCTUATIONS, YBA2CU3O6+X, SPECTRUM, LA2CUO4
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/112719
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