Peak effect caused by compositional modulation in superconducting (Hg,Pb)(Ba,Sr)-1223 single crystal
The authors have discovered fish-tail phenomenon/peak effect in a (Hg,Pb)(Ba,Sr){sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} [(Hg,Pb)(Ba,Sr)-1223] single crystal. Microscopic analyses and observations were performed to elucidate the origin of peak effect in terms of the micro-structure of the (Hg,Pb)(Ba,Sr)-1223 single crystal. In a [001] ED pattern of the crystal, streaks were observed along <110> at each spot. Distortions were seen along <110> in HRTE-micrograph of the (001) plane, and a compositional modulation was clearly detected with respect to the Hg/Pb ratio along [110] with an average periodicity of {approximately}18 nm. Such a spinodal-wave-like inhomogeneity in the local composition may yield mesoscopically distributed weak pinning centers which is most likely responsible for the appearance of peak effect.
- Research Organization:
- Tokyo Inst. of Tech., Yokohama (JP)
- OSTI ID:
- 20012901
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 117; ISSN JLTPAC; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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