Magnetic anomaly in a Pb<sub>2</sub>Sr<sub>2</sub>Y<sub>1-x</sub>Ca<sub>x</sub>Cu<sub>3</sub>O<sub>8+y</sub> single crystal
A K Pradhan; P Chaddah; S B Roy; Chen Changkang; A K Pradhan; Low Temp. Phys. Group, Centre for Adv. Technol., Indore, India; P Chaddah; Low Temp. Phys. Group, Centre for Adv. Technol., Indore, India; S B Roy; Low Temp. Phys. Group, Centre for Adv. Technol., Indore, India; Chen Changkang; Low Temp. Phys. Group, Centre for Adv. Technol., Indore, India
Журнал:
Superconductor Science and Technology
Дата:
1994-06-01
Аннотация:
We present a detailed study of the fish-tail anomaly in the magnetization hysteresis curve of a crystal of Pb<sub>2</sub>Sr<sub>2</sub>Y<sub>1-x</sub>Ca<sub>x</sub>Cu<sub>3</sub>O<sub>8+y</sub>. We also present measurements of field-cooled and zero-field cooled magnetization, and of time decay in the remanent state. We show that these data support the suggestion of Daeumling et al that the fish-tail results from a microscopic distribution of a second phase and oxygen defects which provide additional pinning at low fields, but develop into normal regions at high fields.
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