The irreversibility line and flux creep. A comparative study of Ba-xKxBiO3-δ and YBa2Cu3O7-δ

Y. Y. Xue; Z. J. Huang; H. H. Fang; W. C. Chan; P. H. Hor; C. W. Chu; M. L. Norton; H. Y. Tang

doi:10.1016/0921-4534(92)90691-5

The irreversibility line and flux creep. A comparative study of Ba_-xK_xBiO_3-δ and YBa₂Cu₃O_7-δ

Y. Y. Xue, Z. J. Huang, H. H. Fang, W. C. Chan, P. H. Hor, C. W. Chu, M. L. Norton, H. Y. Tang

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Abstract

The relative flux creep rate S(t)≡d lnM/d ln t of a single crystal of Ba_1-xK_xBiO_3-δ(BKBO) was measured up to a few degrees Kelvin below the irreversibility line. It is nearly constant at low temperatures but rises sharply after a threshold temperature T_t. Above T_t, the creep changes from logarithmic to non-logarithmic decay. All these are very similar to those observed in Y₁Ba₂Cu₃O_7-δ (YBCO) samples and suggest a flux-lattice phase sub-boundary. The ratio between the boundary field B_t and the irreversibility field B_i falls between 0.15 and 0.25 for both BKBO and YBCO at various temperatures, implying a possible close relationship between the boundary and the irreversibility line.

Original language	English
Pages (from-to)	194-202
Number of pages	9
Journal	Physica C: Superconductivity and its applications
Volume	194
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(92)90691-5
Publication status	Published - 1992 May 1

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(92)90691-5

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title = "The irreversibility line and flux creep. A comparative study of Ba-xKxBiO3-δ and YBa2Cu3O7-δ",

abstract = "The relative flux creep rate S(t)≡d lnM/d ln t of a single crystal of Ba1-xKxBiO3-δ(BKBO) was measured up to a few degrees Kelvin below the irreversibility line. It is nearly constant at low temperatures but rises sharply after a threshold temperature Tt. Above Tt, the creep changes from logarithmic to non-logarithmic decay. All these are very similar to those observed in Y1Ba2Cu3O7-δ (YBCO) samples and suggest a flux-lattice phase sub-boundary. The ratio between the boundary field Bt and the irreversibility field Bi falls between 0.15 and 0.25 for both BKBO and YBCO at various temperatures, implying a possible close relationship between the boundary and the irreversibility line.",

author = "Xue, {Y. Y.} and Huang, {Z. J.} and Fang, {H. H.} and Chan, {W. C.} and Hor, {P. H.} and Chu, {C. W.} and Norton, {M. L.} and Tang, {H. Y.}",

note = "Funding Information: We would like to thankR .L. Meng and Y.K. Tao for the melt-textureadn ds inglec rystaYl BCO sam-pies.T his work is supporteidn partb y theN SF Low TemperaturPeh ysicsP rogramG rantNo. DMR 86-126539,D ARPA Grant No. MDA 972-88-G-002, NASA Grant No. NAGW-977,T exasC enterf or Su-perconductiviatyt the Universityo f Houstona, nd theT .L.L. TempleF oundationT.h ework at theU ni-versity of Georgia is partially supportedb y the SURA/ORAU/ORNL SummerC ooperativeP ro-gram i 990.",

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doi = "10.1016/0921-4534(92)90691-5",

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T1 - The irreversibility line and flux creep. A comparative study of Ba-xKxBiO3-δ and YBa2Cu3O7-δ

AU - Xue, Y. Y.

AU - Huang, Z. J.

AU - Fang, H. H.

AU - Chan, W. C.

AU - Hor, P. H.

AU - Chu, C. W.

AU - Norton, M. L.

AU - Tang, H. Y.

N1 - Funding Information: We would like to thankR .L. Meng and Y.K. Tao for the melt-textureadn ds inglec rystaYl BCO sam-pies.T his work is supporteidn partb y theN SF Low TemperaturPeh ysicsP rogramG rantNo. DMR 86-126539,D ARPA Grant No. MDA 972-88-G-002, NASA Grant No. NAGW-977,T exasC enterf or Su-perconductiviatyt the Universityo f Houstona, nd theT .L.L. TempleF oundationT.h ework at theU ni-versity of Georgia is partially supportedb y the SURA/ORAU/ORNL SummerC ooperativeP ro-gram i 990.

PY - 1992/5/1

Y1 - 1992/5/1

N2 - The relative flux creep rate S(t)≡d lnM/d ln t of a single crystal of Ba1-xKxBiO3-δ(BKBO) was measured up to a few degrees Kelvin below the irreversibility line. It is nearly constant at low temperatures but rises sharply after a threshold temperature Tt. Above Tt, the creep changes from logarithmic to non-logarithmic decay. All these are very similar to those observed in Y1Ba2Cu3O7-δ (YBCO) samples and suggest a flux-lattice phase sub-boundary. The ratio between the boundary field Bt and the irreversibility field Bi falls between 0.15 and 0.25 for both BKBO and YBCO at various temperatures, implying a possible close relationship between the boundary and the irreversibility line.

AB - The relative flux creep rate S(t)≡d lnM/d ln t of a single crystal of Ba1-xKxBiO3-δ(BKBO) was measured up to a few degrees Kelvin below the irreversibility line. It is nearly constant at low temperatures but rises sharply after a threshold temperature Tt. Above Tt, the creep changes from logarithmic to non-logarithmic decay. All these are very similar to those observed in Y1Ba2Cu3O7-δ (YBCO) samples and suggest a flux-lattice phase sub-boundary. The ratio between the boundary field Bt and the irreversibility field Bi falls between 0.15 and 0.25 for both BKBO and YBCO at various temperatures, implying a possible close relationship between the boundary and the irreversibility line.

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The irreversibility line and flux creep. A comparative study of Ba_-xK_xBiO_3-δ and YBa₂Cu₃O_7-δ

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