Systematic magnetization measurements on single crystalline Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} with columnar defects

Journal Article · Wed Dec 01 04:00:00 EST 1999 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1023/A:1022514305224· OSTI ID:20015338

Kimura, Kazuhiro; Koshida, Ryo; Kwok, W K; Crabtree, G W; Okayasu, Satoru; Sataka, Masao; Kazumata, Yukio; Kadowaki, Kazuo

The authors have performed systematic magnetization measurements on single crystalline Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} with columnar defects of B{sub {Phi}} = 0.005 to 1 T by using a SQUID magnetometer. Magnetization hysteresis curves of the pristine sample show a weak irreversible behavior in the vortex liquid state, suggesting the existence of the new vortex state in the vortex liquid state. This weak irreversible region persists systematically in the samples with columnar defects even up to B{sub {Phi}} = 1 T. It is shown that the weak hysteresis of magnetization is sensitive to the disorder level of the sample and shifts systematically to higher temperature and field region with increasing the number of columnar defects. This behavior clearly indicates that effective pinning mechanism exists even in the vortex liquid state and generates a finite critical current.

• Research Organization: Univ. of Tsukuba, Ibaraki (JP)
• OSTI ID: 20015338
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 117; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL DEFECTS
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
MAGNETIZATION
MIXED STATE
STRONTIUM OXIDES