Quantum magnetic excitations from stripes in copper oxide superconductors


Superconductivity appears when mobile 'holes' are doped into the insulating state, and it coexists with antiferromagnetic fluctuations. We report neutron scattering measurements on stripe-ordered La1.875Ba0.125CuO4. We show that the measured excitations are, surprisingly, quite similar to those in YBa2Cu3O6+x . Our results support the concept that stripe correlations are essential to high-transition-temperature superconductivity.This work was carried out under the joint study group composing IMR (JPN), Brookhaven National Laboratory (USA) and Ratherford Appleton Laboratory (UK). The result was published in Nature 429, 534 - 538 (03 June 2004).
Prof. Yamada group(Neutron and gamma-Ray Spectroscopy on Condensed Matters)