Flux dynamics and irreversibility in YBa{sub 2}Cu{sub 3}O{sub 7} with Y{sub 2}BaCuO{sub 5} inclusions and in single crystal YBa{sub 2}Cu{sub 3}O{sub 7}
- Norges Tekniske Hoegskole, Trondheim (Norway). Div. of Physics
- Argonne National Lab., IL (United States)
- Superconductivity Research Lab., Tokyo (Japan)
- School of Physics, Univ. of Birmingham, Birmingham (UK)
We have measured the ac magnetic permeability response function {mu} = {mu}{prime} + i{mu}{double_prime} in melt-processed melt grown YBa{sub 2}Cu{sub 3}O{sub 7} with Y{sub 2}BaCuO{sub 5} inclusions (MPMG) and in single crystal YBa{sub 2}Cu{sub 3}O{sub 7} (SC) in applied magnetic fields up to 8 Tesla oriented either parallel or perpendicular to the crystalline c-axis. The ac response of the two samples has been mapped out as a function of temperature, frequency, ac field amplitude, dc applied field, and field orientation. The peak in the lossy part of the susceptibility {mu}{double_prime} is used to probe the flux dynamics in the vicinity of the irreversibility line. The data are interpreted by comparison with expectations of an anisotropic vortex glass- to -liquid transition. The inferred melting lines as well as the frequency dependence and non-linear response are in overall agreement with the expected behavior. In the range of available parameters and variables we find the system to be in the solid vortex phase for H{perpendicular}c since there is a strong H{sub ac} dependence and only a weak frequency dependence on the temperature position of the loss peak. For H{parallel}c, the situation is reversed, and the loss peak depends only weakly on H{sub ac} and strongly on the frequency.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10136613
- Report Number(s):
- ANL/CP-75450; CONF-9112107-1; ON: DE92009712
- Resource Relation:
- Conference: Nobel jubliee symposium on low dimensional properties of solids,Gothenburg (Sweden),4-7 Dec 1991; Other Information: PBD: Jan 1992
- Country of Publication:
- United States
- Language:
- English
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