Flux Pinning and Magnetic Anisotropy in Neutron Irradiated Hg-Ba-Ca-Cu-O

Yang Ren Sun; Kathleen M. Amm; Justin Schwartz

doi:10.1109/77.402946

Flux Pinning and Magnetic Anisotropy in Neutron Irradiated Hg-Ba-Ca-Cu-O

Yang Ren Sun, Kathleen M. Amm, Justin Schwartz

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

17 Scopus citations

Abstract

Magnetic studies are performed on randomly oriented and aligned polycrystalline samples of HgBa2CaCu2O6+x (Hg-1212) and HgBa2CaCu2O8+x (Hg-1223). The measurements of magnetic hysterisis and magnetic relaxation confirmed the existence of a strong surface barrier. The decay of the critical current density Jc with temperature is much slower than the decay of their single-layered counterpart, Hg-1201. Measurements of aligned Hg-1212 revealed that the dependence of Jc on field orientation is relatively weak and the irreversible area in the H-T plane is much wider than other high temperature superconductors. Although neutron irradiation only enhances the critical current values moderately and severely suppresses the surface pinning, neutron irradiation improves all of the magnetic properties mentioned above, and at T = 100 K, the hysteresis loop remains open up to H = 6 kG.

Original language	English (US)
Pages (from-to)	1870-1875
Number of pages	6
Journal	IEEE Transactions on Applied Superconductivity
Volume	5
Issue number	2
DOIs	https://doi.org/10.1109/77.402946
State	Published - Jun 1995

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Flux Pinning and Magnetic Anisotropy in Neutron Irradiated Hg-Ba-Ca-Cu-O",

abstract = "Magnetic studies are performed on randomly oriented and aligned polycrystalline samples of HgBa2CaCu2O6+x (Hg-1212) and HgBa2CaCu2O8+x (Hg-1223). The measurements of magnetic hysterisis and magnetic relaxation confirmed the existence of a strong surface barrier. The decay of the critical current density Jc with temperature is much slower than the decay of their single-layered counterpart, Hg-1201. Measurements of aligned Hg-1212 revealed that the dependence of Jc on field orientation is relatively weak and the irreversible area in the H-T plane is much wider than other high temperature superconductors. Although neutron irradiation only enhances the critical current values moderately and severely suppresses the surface pinning, neutron irradiation improves all of the magnetic properties mentioned above, and at T = 100 K, the hysteresis loop remains open up to H = 6 kG.",

author = "Sun, {Yang Ren} and Amm, {Kathleen M.} and Justin Schwartz",

note = "Funding Information: Manuscript received October 18, 1994. This work was supported by U.S.N ational Science Foundation Contract No. DMR 91-20000 through the Science and Technology Center for Superconductivity and the National High Magnetic Field Laboratory.",

year = "1995",

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publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Flux Pinning and Magnetic Anisotropy in Neutron Irradiated Hg-Ba-Ca-Cu-O

AU - Sun, Yang Ren

AU - Amm, Kathleen M.

AU - Schwartz, Justin

N1 - Funding Information: Manuscript received October 18, 1994. This work was supported by U.S.N ational Science Foundation Contract No. DMR 91-20000 through the Science and Technology Center for Superconductivity and the National High Magnetic Field Laboratory.

PY - 1995/6

Y1 - 1995/6

N2 - Magnetic studies are performed on randomly oriented and aligned polycrystalline samples of HgBa2CaCu2O6+x (Hg-1212) and HgBa2CaCu2O8+x (Hg-1223). The measurements of magnetic hysterisis and magnetic relaxation confirmed the existence of a strong surface barrier. The decay of the critical current density Jc with temperature is much slower than the decay of their single-layered counterpart, Hg-1201. Measurements of aligned Hg-1212 revealed that the dependence of Jc on field orientation is relatively weak and the irreversible area in the H-T plane is much wider than other high temperature superconductors. Although neutron irradiation only enhances the critical current values moderately and severely suppresses the surface pinning, neutron irradiation improves all of the magnetic properties mentioned above, and at T = 100 K, the hysteresis loop remains open up to H = 6 kG.

AB - Magnetic studies are performed on randomly oriented and aligned polycrystalline samples of HgBa2CaCu2O6+x (Hg-1212) and HgBa2CaCu2O8+x (Hg-1223). The measurements of magnetic hysterisis and magnetic relaxation confirmed the existence of a strong surface barrier. The decay of the critical current density Jc with temperature is much slower than the decay of their single-layered counterpart, Hg-1201. Measurements of aligned Hg-1212 revealed that the dependence of Jc on field orientation is relatively weak and the irreversible area in the H-T plane is much wider than other high temperature superconductors. Although neutron irradiation only enhances the critical current values moderately and severely suppresses the surface pinning, neutron irradiation improves all of the magnetic properties mentioned above, and at T = 100 K, the hysteresis loop remains open up to H = 6 kG.

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Flux Pinning and Magnetic Anisotropy in Neutron Irradiated Hg-Ba-Ca-Cu-O

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