Neutron investigation of Nd{sub 2-x-y}Ce{sub x}La{sub y}CuO{sub 4} (0{le}x{le}0.2; y=0.5, 1)
Journal Article
·
· Journal of Low Temperature Physics
- ETH Zurich & Paul Scherrer Institute, Villigen (Switzerland); and others
Samples of the electron-doped superconductor precursor Nd{sub 2{minus}x{minus}y}Ce{sub x}La{sub y}CuO{sub 4} with 0{le}x{le}0.2 and y=0.5, l have been synthesized with a sol-gel method. While the as-prepared samples are in the normal state, oxygen reduction results in superconducting samples. The dependence of T{sub c} upon Ce-doping x and oxygen content (4{minus}{delta}) was determined in detail. It turned out that the internal pressure exerted by the La ions results in an extended superconducting range in x and {delta} compared to Nd{sub 2{minus}x}Ce{sub x}CuO{sub 4{minus}{delta}}. Elastic neutron scattering was used to investigate the dependence of structural features upon doping. Upon oxygen reduction a non-isotropic shrinking of the unit cell (lattice parameter a increases, c decreases) and indications for interstitial oxygen were found. The local electronic surrounding of the Nd ions was observed via the crystal-field splitting by inelastic neutron scattering and turned out to be inhomogeneous. Such electronic inhomogeneities were previously measured for other high-T{sub c} superconductors.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 443689
- Report Number(s):
- CONF-960808--
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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