Magnetic relaxation in sintered Tl2Ca2Ba2Cu3Ox and YBa2Cu3O7−x superconductors

M. E. McHenry; M. P. Maley; E. L. Venturini; D. L. Ginley

doi:10.1103/PhysRevB.39.4784

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Magnetic relaxation in sintered Tl2Ca2Ba2Cu3Ox and YBa2Cu3O7−x superconductors

M. E. McHenry, M. P. Maley, E. L. Venturini, D. L. Ginley

DOI 10.1103/PhysRevB.39.4784 · Physical Review B

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Abstract

We have characterized the time dependence of the zero-field-cooled magnetization for sintered pellets of the Tl 2:2:2:3 and Y 1:2:3 superconductors. The magnetic relaxation in both cases is large and exhibits a logarithmic time dependence. The temperature dependence of the relaxation rate A=dM/d ln(t) has been characterized for both materials for applied fields of 1,2,3, and 10 kG. The relaxation rate for the Y 1:2:3 sintered material is comparable to that observed in similar sintered materials and in single crystals. The Tl 2:2:2:3 material exhibits similar relaxation spectra with a weaker temperature dependence at a given field consistent with stronger pinning in this material. The temperature dependence of the relaxation is analyzed using a phenomenological relaxation model to yield an average pinning energy (0.33 eV at H=1 kG) and its field dependence.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure unresolved	midpoint
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89	Pressure unresolved	zero_resistance
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	93	Pressure unresolved	onset
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	74	Pressure unresolved	midpoint
Tl2Ca2Ba2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure unresolved	unknown
La(Ba)2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi4Sr3Ca3Cu4Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown