Magnetic Excitations in Superconducting La2-xCa1+xCu2O6+d
ORAL
Abstract
We report inelastic neutron scattering experiments on superconducting and non-superconducting La2-xCa1+xCu2O6+d single crystals, with superconductivity induced by high-pressure oxygen annealing. The magnetic excitations in the non-superconducting composition are similar to those in other weakly hole-doped cuprates, being commensurate and having a similar intensity temperature-dependence. In the superconducting samples, though the excitations appear commensurate, the intensity temperature-dependence is much different and there is broadening and a decrease in the steepness of the dispersion. For the elastic magnetic scattering, changes are also seen, with 3-dimensional antiferromagnetic order in the non-superconducting sample being replaced by 2-dimensional magnetic correlations in the superconducting samples. We will discuss these results and how they fit into the trends seen for other hole-doped cuprates.
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Authors
John Schneeloch
Stonybrook University
Comdensed Matter Physics \& materials Science Department, Brookhaven national laboratory
Brookhaven Natl Lab
Brookhaven National Laboratory
Ruidan Zhong
Brookhaven National Laboratory
Comdensed Matter Physics \& materials Science Department, Brookhaven national laboratory
Brookhaven Natl Lab
Zhijun Xu
National Institute of Standards and Technology
Alexander Kolesnikov
Oak Ridge National Laboratory
Matthew Stone
ORNL
Oak Ridge National Laboratory
Quantum Condensed Matter Division, Oak Ridge National Laboratory
Guangyong Xu
Brookhaven National Laboratory
Comdensed Matter Physics & materials Science Department, Brookhaven national laboratory
Genda Gu
Brookhaven National Laboratory
Comdensed Matter Physics \& materials Science Department, Brookhaven national laboratory
Brookhaven Natl Lab
John Tranquada
Brookhaven National Laboratory
Comdensed Matter Physics \& materials Science Department, Brookhaven national laboratory
