Thermodynamic properties of YBa{sub 2}Cu{sub 4}O{sub 8} crystal near upper critical fields H{sub c2}(T)
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, South (Korea)
- Department of Physics, Chungbuk National University, Cheongju 361-763, South (Korea)
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801 (United States)
- Department of Physics, Northern Illinois University, DeKalb, Illinois 60115 (United States)
High-field magnetization with external magnetic fields parallel to the c-axis has been measured in high-quality YBa{sub 2}Cu{sub 4}O{sub 8} single crystal. The fluctuation-induced magnetization above T{sub c} and a crossover of magnetization curves M(T) at T{sup {asterisk}}=77.4 K were clearly observed for various magnetic fields, and analyzed by the high-field scaling law and the vortex fluctuation theory for three-dimensional systems. In the reversible temperature region, the magnetization is well described by the model of Hao {ital et al.} [Phys. Rev. B {bold 43}, 2884 (1991)]. From this analysis, the thermodynamic parameters such as upper critical field slope {minus}dH{sub c2}/dT=1.2 T/K near T{sub c}, penetration depth {lambda}{sub ab}(0)=1943 {Angstrom}, and coherence length {xi}{sub ab}(0)=21.7 {Angstrom} were extracted. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496454
- Report Number(s):
- CONF-961141--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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