Critical currents and irreversibility lines in HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1-xSrx)2 Cu3O8+δ

K. H. Yoo; N. H. Hur; Y. K. Park; J. C. Park; Y. Y. Song; S. C. Yu

doi:10.1016/0921-4534(94)90139-2

Critical currents and irreversibility lines in HgBa₂(Ca_1-xSr_x)₂Cu₃O_8+δ and Hg_0.5Tl_0.5Ba₂(Ca_1-xSr_x)₂ Cu₃O_8+δ

K. H. Yoo, N. H. Hur, Y. K. Park, J. C. Park, Y. Y. Song, S. C. Yu

Department of Physics

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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 HgBa₂(Ca_1-xSr_x)₂Cu₃O_8+δ and Hg_0.5Tl_0.5Ba₂(Ca_1-xSr_x)₂Cu₃O_8+δ. J_c(H, T) and H_irr(T) of Hg_0.5Tl_0.5Ba₂(Ca_1-xSr_x)₂Cu₃O_8+δ are found to be higher than those of HgBa₂(Ca_1-xSr_x)₂Cu₃O_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 HgBa₂(Ca_1-xSr_x)₂Cu₃O_8+δ and Hg_0.5Tl_0.5Ba₂(Ca_{1- x}Sr_x)₂Cu₃O_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.

Original language	English
Pages (from-to)	21-25
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	231
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(94)90139-2
Publication status	Published - 1994 Sept 20

Bibliographical note

Funding Information:
This work is supported by the Ministry of Science and Technology of the Republic of Korea. We appreciate K.W. Lee, C.M. Ibm, Y.S. Kim, and H.C. Lee for their technical assistance in the magnetization measurements using the DC SQUID magnetometer.

All Science Journal Classification (ASJC) codes

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

Access to Document

10.1016/0921-4534(94)90139-2

Cite this

@article{e9d55d58143048bf8f722a7dc69502af,

title = "Critical currents and irreversibility lines in HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1-xSrx)2 Cu3O8+δ",

abstract = "We have investigated the temperature dependence and applied magnetic-field dependences of critical current densities Jc(H, T) and the irreversibility lines Hirr(T) obtained from the magnetization measurements in HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1-xSrx)2Cu3O8+δ. Jc(H, T) and Hirr(T) of Hg0.5Tl0.5Ba2(Ca1-xSrx)2Cu3O8+δ are found to be higher than those of HgBa2(Ca1-xSrx)2Cu3O8+δ, indicating that the Tl substitution at Hg sites provides additional flux pinning. Jc(H, T) has been analyzed using the flux-creep model. Jc(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 HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1- xSrx)2Cu3O8+δ. Also, in Hirr(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 Hirr(T) and Jc(H, T) is not clear, the two phenomena are considered to be closely related.",

author = "Yoo, {K. H.} and Hur, {N. H.} and Park, {Y. K.} and Park, {J. C.} and Song, {Y. Y.} and Yu, {S. C.}",

note = "Funding Information: This work is supported by the Ministry of Science and Technology of the Republic of Korea. We appreciate K.W. Lee, C.M. Ibm, Y.S. Kim, and H.C. Lee for their technical assistance in the magnetization measurements using the DC SQUID magnetometer.",

year = "1994",

month = sep,

day = "20",

doi = "10.1016/0921-4534(94)90139-2",

language = "English",

volume = "231",

pages = "21--25",

journal = "Physica C: Superconductivity and its applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "1-2",

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TY - JOUR

T1 - Critical currents and irreversibility lines in HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1-xSrx)2 Cu3O8+δ

AU - Yoo, K. H.

AU - Hur, N. H.

AU - Park, Y. K.

AU - Park, J. C.

AU - Song, Y. Y.

AU - Yu, S. C.

N1 - Funding Information: This work is supported by the Ministry of Science and Technology of the Republic of Korea. We appreciate K.W. Lee, C.M. Ibm, Y.S. Kim, and H.C. Lee for their technical assistance in the magnetization measurements using the DC SQUID magnetometer.

PY - 1994/9/20

Y1 - 1994/9/20

N2 - We have investigated the temperature dependence and applied magnetic-field dependences of critical current densities Jc(H, T) and the irreversibility lines Hirr(T) obtained from the magnetization measurements in HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1-xSrx)2Cu3O8+δ. Jc(H, T) and Hirr(T) of Hg0.5Tl0.5Ba2(Ca1-xSrx)2Cu3O8+δ are found to be higher than those of HgBa2(Ca1-xSrx)2Cu3O8+δ, indicating that the Tl substitution at Hg sites provides additional flux pinning. Jc(H, T) has been analyzed using the flux-creep model. Jc(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 HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1- xSrx)2Cu3O8+δ. Also, in Hirr(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 Hirr(T) and Jc(H, T) is not clear, the two phenomena are considered to be closely related.

AB - We have investigated the temperature dependence and applied magnetic-field dependences of critical current densities Jc(H, T) and the irreversibility lines Hirr(T) obtained from the magnetization measurements in HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1-xSrx)2Cu3O8+δ. Jc(H, T) and Hirr(T) of Hg0.5Tl0.5Ba2(Ca1-xSrx)2Cu3O8+δ are found to be higher than those of HgBa2(Ca1-xSrx)2Cu3O8+δ, indicating that the Tl substitution at Hg sites provides additional flux pinning. Jc(H, T) has been analyzed using the flux-creep model. Jc(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 HgBa2(Ca1-xSrx)2Cu3O8+δ and Hg0.5Tl0.5Ba2(Ca1- xSrx)2Cu3O8+δ. Also, in Hirr(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 Hirr(T) and Jc(H, T) is not clear, the two phenomena are considered to be closely related.

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