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- W2022280529 abstract "Abstract We have investigated the temperature dependence and applied magnetic-field dependences of critical current densities J c ( H , T ) and the irreversibility lines H irr ( T ) obtained from the magnetization measurements in HgBa 2 (Ca 1- x Sr x ) 2 Cu 3 O 8+ δ and Hg 0.5 Tl 0.5 Ba 2 (Ca 1- x Sr x ) 2 Cu 3 O 8+ δ . J c ( H , T ) and H irr ( T ) of Hg 0.5 Tl 0.5 Ba 2 (Ca 1- x Sr x ) 2 Cu 3 O 8+ δ are found to be higher than those of HgBa 2 (Ca 1- x Sr x ) 2 Cu 3 O 8+ δ , indicating that the Tl substitution at Hg sites provides additional flux pinning. J c ( H , T ) has been analyzed using the flux-creep model. J c ( H , T ) in magnetic fields above 1 T is well described by the flux-creep model. However, the thermal activation energy estimated by fitting the data to the flux-creep model shows different behaviors above and below about 65 K for both HgBa 2 (Ca 1- x Sr x ) 2 Cu 3 O 8+ δ and Hg 0.5 Tl 0.5 Ba 2 (Ca 1- x Sr x ) 2 Cu 3 O 8+ δ . Also, in H irr ( T ) a crossover from a power-law temperature dependence above 65 K to a more rapid dependence below 65 K is observed in both samples. Although the origin of such a crossover in H irr ( T ) and J c ( H , T ) is not clear, the two phenomena are considered to be closely related." @default.
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- W2022280529 date "1994-09-01" @default.
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- W2022280529 title "Critical currents and irreversibility lines in HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1-xSrx)2 Cu3O8+δ" @default.
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- W2022280529 doi "https://doi.org/10.1016/0921-4534(94)90139-2" @default.
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