Optical-microscope image of oxygen-annealed single crystals.
(a) Temperature dependence of resistivity for and as-grown . (b) Temperature dependence of resistivity for oxygen-annealed .
Enlargement of the resistive superconducting transitions for oxygen-annealed .
Temperature dependence of magnetic susceptibility for oxygen-annealed .
(a) Temperature dependence of in-plane resistivity for under magnetic fields up to 7 T perpendicular to axis. (b) Temperature dependence of in-plane resistivity for under magnetic fields up to 7 T parallel to axis. (c) Temperature dependence of upper critical field .
S concentration dependence of lattice constant for both as-grown and oxygen-annealed crystal.
Phase diagram of oxygen-annealed single crystal grown using the self-flux method. Antiferromagnetic, paramagnetic, and superconducting are abbreviated as AFM, PM, and SC. AFM transition temperature was determined from resistivity measurement. Filled circle and open triangle are and determined from the resistivity measurement, respectively.
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