Evolution of the zone boundary anomalies in lightly doped La2-xSrxCuO4
We have discovered anomalies in the spin wave energy and intensity at the (ð,0) point along the zone boundary in the 2D Heisenberg antiferromagnet Cu(DCOO)2•4D2O and in the undoped parent compounds of the high-temperature cuprate superconductors La2-xSrxCuO4 and YBa2Cu3O6+y. This anomaly may be related to RVB-type correlations, and hence the clue to how upon doping the cuprates turn from antiferromagnets to superconductors. A first experiment was performed on IN1 to test this hypothesis, however due to instrumental difficulties only half of the given beamtime could be used. For La2CuO4, the spin wave peaks at very high energy transfer were detected on the IN1 spectrometer with sufficient intensity, which shows the feasibility of the experiment. We therefore propose a continuation of the investigation on the evolution of the zone boundary anomalies upon weak (0-9%) doping and thus ask for 8 days of beamtime.
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Henrik M. Ronnow; N. B. Christensen; DALLA PIAZZA Bastien; HAYDEN Stephen M.; JIMENEZ RUIZ Monica; LANCON Diane and PRSA Krunoslav. (2013). Evolution of the zone boundary anomalies in lightly doped La2-xSrxCuO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1298
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