Relation between the peak effect and the magnetization step in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y}

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00768515· OSTI ID:457269

Ooi, Shuuichi; Tamegai, Tsuyoshi; Shibauchi, Takasada ^[1]

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1. Univ. of Tokyo, Hongo (Japan)

Local magnetization (B{sub l}{minus}H{sub a}) as a function of magnetic field (H{sub a}) was measured by using micro Hall probes in high quality Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} single crystals with different oxygen content. In an as-grown sample, magnetization step which is the sign of a first order phase transition in the vortex system is observed. The step field, B{sub s}, increases with decreasing temperature and saturates at 300 Oe where the peak effect occurs at lower temperatures. As oxygen content is increased, the magnetization step becomes smaller. Instead, an anomalous temperature dependent peak effect (ATDPE) appears on a line similar to B{sub s}(T) line. The reduction of magnetization step and the appearance of ATDPE with increasing oxygen contents can be understood by considering the increase of the inhomogeneity of samples rather than the decrease in the anisotropy.

• Sponsoring Organization: USDOE
• OSTI ID: 457269
• Report Number(s): CONF-960808--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
MAGNETIZATION
STRONTIUM OXIDES