Volume 39, Number 6, September 1997
|Page(s)||663 - 668|
|Section||Condensed matter: electronic, structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Importance of the magnetic ground state of Pr for Tc suppression in high-Tc superconductors
Swiss Light Source Project, Paul Scherrer Institute, CH-5232 Villigen PSI,
2 Chemistry Division, Argonne National Laboratory, Argonne Il-60439, U.S.A
3 Material Science Division, Argonne National Laboratory, Argonne Il-60439, U.S.A
4 Laboratory for Neutron Scattering, ETH and PSI, CH-5232 Villigen PSI
5 Institut Laue Langevin, 156 X, F-38042 Grenoble Cedex, France
Accepted: 7 August 1997
An increase in the magnetic, quasi-triplet average ground-state splitting of Pr in () compared to that observed for the parent, Ca-free compound, is observed by inelastic neutron scattering. The increase in splitting due to Ca doping demonstrates that Ca is altering the electronic properties of Pr in addition to its role in charge transfer. It is argued that Ca doping is effectively suppressing superconducting pair breaking by changing the single-ion magnetic properties of the Pr ions. This points toward pair breaking as the cause of Tc suppression in Pr-based compounds.
PACS: 74.72.-h – High-Tc compounds / 74.62.Dh – Effects of crystal defects, doping and substitution / 71.70.Ch – Crystal and ligand fields
© EDP Sciences, 1997
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