Irreversibility field above 14 T at 77 K in (Nd-Eu-Gd) Ba2Cu3Oy

M. Muralidhar; N. Sakai; M. Jirsa; M. Murakami

doi:10.1109/TASC.2003.812111

Irreversibility field above 14 T at 77 K in (Nd-Eu-Gd) Ba₂Cu₃O_y

M. Muralidhar, N. Sakai, M. Jirsa, M. Murakami

Research output: Contribution to journal › Conference article › peer-review

10 Citations (Scopus)

Abstract

In (Nd_0.33 Eu_0.38 Gd_0.28) Ba₂ a new type of nanometer-scale pinning center was created by choosing an appropriate matrix chemical ratio. Such a pinning center could be controlled via externally added small quantity of 211 (NEG-211 or Gd-211) secondary phase. Microstructure analysis combined with magnetic characterization clarified that the sample with a high irreversibillty field always exhibits chemical modulation and formation of a special nanometer-scale lamellar structure. High magnification STM observations revealed that the nano-Iamellas consist of rows of aligned NEG-rich clusters 3 to 4 nm in size. This new material with the Nd:Eu:Gd ratio of 1:1.25:0.85 combined with 5 mol% 211 secondary phase exhibits the high secondary peak position at around 4.5 T and the irreversibility field over 14 T at 77 K for H_a ∥ c-axis.

Original language	English
Pages (from-to)	3091-3094
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	13
Issue number	2 III
DOIs	https://doi.org/10.1109/TASC.2003.812111
Publication status	Published - 2003 Jun
Externally published	Yes
Event	2002 Applied Superconductivity Conference - Houston, TX, United States Duration: 2002 Aug 4 → 2002 Aug 9

Keywords

Critical current density
Flux pinning
Melt-processed bulk materials
STM

ASJC Scopus subject areas

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

Access to Document

10.1109/TASC.2003.812111

Cite this

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title = "Irreversibility field above 14 T at 77 K in (Nd-Eu-Gd) Ba2Cu3Oy",

abstract = "In (Nd0.33 Eu0.38 Gd0.28) Ba2 a new type of nanometer-scale pinning center was created by choosing an appropriate matrix chemical ratio. Such a pinning center could be controlled via externally added small quantity of 211 (NEG-211 or Gd-211) secondary phase. Microstructure analysis combined with magnetic characterization clarified that the sample with a high irreversibillty field always exhibits chemical modulation and formation of a special nanometer-scale lamellar structure. High magnification STM observations revealed that the nano-Iamellas consist of rows of aligned NEG-rich clusters 3 to 4 nm in size. This new material with the Nd:Eu:Gd ratio of 1:1.25:0.85 combined with 5 mol% 211 secondary phase exhibits the high secondary peak position at around 4.5 T and the irreversibility field over 14 T at 77 K for Ha ∥ c-axis.",

keywords = "Critical current density, Flux pinning, Melt-processed bulk materials, STM",

author = "M. Muralidhar and N. Sakai and M. Jirsa and M. Murakami",

note = "Funding Information: Manuscript received August 5, 2002. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications.; 2002 Applied Superconductivity Conference ; Conference date: 04-08-2002 Through 09-08-2002",

year = "2003",

month = jun,

doi = "10.1109/TASC.2003.812111",

language = "English",

volume = "13",

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journal = "IEEE Transactions on Applied Superconductivity",

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T1 - Irreversibility field above 14 T at 77 K in (Nd-Eu-Gd) Ba2Cu3Oy

AU - Muralidhar, M.

AU - Sakai, N.

AU - Jirsa, M.

AU - Murakami, M.

N1 - Funding Information: Manuscript received August 5, 2002. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications.

PY - 2003/6

Y1 - 2003/6

N2 - In (Nd0.33 Eu0.38 Gd0.28) Ba2 a new type of nanometer-scale pinning center was created by choosing an appropriate matrix chemical ratio. Such a pinning center could be controlled via externally added small quantity of 211 (NEG-211 or Gd-211) secondary phase. Microstructure analysis combined with magnetic characterization clarified that the sample with a high irreversibillty field always exhibits chemical modulation and formation of a special nanometer-scale lamellar structure. High magnification STM observations revealed that the nano-Iamellas consist of rows of aligned NEG-rich clusters 3 to 4 nm in size. This new material with the Nd:Eu:Gd ratio of 1:1.25:0.85 combined with 5 mol% 211 secondary phase exhibits the high secondary peak position at around 4.5 T and the irreversibility field over 14 T at 77 K for Ha ∥ c-axis.

AB - In (Nd0.33 Eu0.38 Gd0.28) Ba2 a new type of nanometer-scale pinning center was created by choosing an appropriate matrix chemical ratio. Such a pinning center could be controlled via externally added small quantity of 211 (NEG-211 or Gd-211) secondary phase. Microstructure analysis combined with magnetic characterization clarified that the sample with a high irreversibillty field always exhibits chemical modulation and formation of a special nanometer-scale lamellar structure. High magnification STM observations revealed that the nano-Iamellas consist of rows of aligned NEG-rich clusters 3 to 4 nm in size. This new material with the Nd:Eu:Gd ratio of 1:1.25:0.85 combined with 5 mol% 211 secondary phase exhibits the high secondary peak position at around 4.5 T and the irreversibility field over 14 T at 77 K for Ha ∥ c-axis.

KW - Critical current density

KW - Flux pinning

KW - Melt-processed bulk materials

KW - STM

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