Abstract
High-resolution neutron powder diffraction experiments and magnetization measurements were performed for a series of the electron-doped infinite-layer high-temperature superconductors Sr1-xRxCuO2 (R=La, Pr; 0.07≤x≤0.15). Zero-field-cooled magnetization measurements performed for the powder Sr0.9Pr0.1CuO2 sample under hydrostatic pressure up to 0.5 GPa at a magnetic field of 0.005 T revealed a downward shift of the onset temperature Tc onset of the diamagnetic response described by the pressure derivative dTconset/dp=-(0.75±0.30) K/GPa. By measuring the reversible superconducting magnetization for the powder aligned Sr0.9Pr0.1CuO2 sample at high fields 1≤μ0H≤5 T, we found that the 3D-lowest-Landau-level approximation is a good description of fluctuation magnetization, if one takes into the curvature of the critical line Bc2(T)∝|T-T c|4/3.
Original language | English |
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Pages (from-to) | 317-324 |
Number of pages | 8 |
Journal | Physica C: Superconductivity and its Applications |
Volume | 402 |
Issue number | 3 |
DOIs | |
State | Published - Feb 15 2004 |
Externally published | Yes |
Funding
The authors thank Albert Furrer for helpful discussions, V. Ivanov for assistance in magneto-pulse pressing of the precursors’ mixture. This work was partially performed at the spallation neutron source SINQ, Paul Scherrer Institute, Villigen, Switzerland. Magnetic measurements reported in this paper were performed at the Center for Magnetic Measurements of the Institute for Metal Physics, Ekaterinburg, while test experiments and preliminary magnetic measurements were carried out at the Laboratory for Neutron Scattering (ETH Zurich and PSI) and at the International Laboratory for High Magnetic Fields and Low Temperatures, Wroclaw, Poland. Financial support by INTAS (grant 99-0256), the Russian Ministry of Industry, Science and Technologies (Contracts No. 40.020.1.1.1166 (Project No. 6/03) and No. 40.012.1.1.1150), and Special Federal Program of Basic Research at Russian Academy of Sciences “Quantum macrophysics” is gratefully acknowledged.
Keywords
- Electron-doped high-T superconductors
- Magnetization
- Neutron diffraction
- Scaling behavior