Temperature dependence of the second magnetization peak in a deoxygenated yBa{sub 2}Cu{sub 3}O{sub 6.65} single crystal.
We report on magnetic measurements carried out in a YBa{sub 2}Cu{sub 3}O{sub 6.65} deoxygenated single crystal with superconducting transition temperature T{sub c}=62.5 K. The so-called fishtail or second magnetization peak (H{sub p}) has been observed in magnetization curves from 60 K down to 1.8 K. In the region 6 K<T<60 K, H{sub p} increases with a positive curvature as the temperature is lowered. For T<6 K, H{sub p} increases linearly with temperature and an extrapolation to T=0 gives H{sub p}(0)=2.9 T. This value occurs just above a decoupling field H{sub d}, above which there is a change in the temperature dependence of the irreversibility line, a departure from the relation (1-T/T{sub c}){sup m}. Magnetic relaxation measurements for fields in the region of the second magnetization peak indicate a change in the mechanism originating the second peak below 5 K. At higher temperatures the peak position changes with time. For temperatures lower than 5 K there is no differences in relaxation below and above H{sub p}, and the position of the peak does not change with time.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); FOR
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 942739
- Report Number(s):
- ANL/MSD/JA-34115; TRN: US200922%%641
- Journal Information:
- Phys. Rev. B, Vol. 60, Issue 1 ; Jul. 1, 1999; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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