Jc(H) crossover in YBCO thick films and Bi2223/Ag tapes with columnar defects

Qiang Li; M. Suenaga; S. R. Foltyn; H. Wang

doi:10.1109/TASC.2005.848213

J_c(H) crossover in YBCO thick films and Bi2223/Ag tapes with columnar defects

Qiang Li
, M. Suenaga
, S. R. Foltyn
, H. Wang

Physics and Astronomy

Brookhaven National Laboratory
Los Alamos National Laboratory

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

7 Scopus citations

Abstract

We report a study of critical current density Jc as a function of temperature T, magnetic field H, and film thickness d in a series of high quality YBa₂Cu₃O_7-δ (YBCO) films. A crossover in the thickness dependence of J_c(H) curves was observed for T > 50 K, where thinner film carries significantly lower J_c(H) than thicker film at high fields, while the opposite was observed at low fields. This J_c(H) crossover behavior seems to be a general feature for a superconducting system with a spectrum of pinning density, whose trend opposes to the effective volume faction for J_c. This generalization is supported by examining J_c(H) crossover behaviors observed earlier in the Bi₂Sr₂Ca₂Cu₃O _10+δ(Bi2223)/Ag tapes irradiated with 5.8 GeV Pb ions, where enhanced J_c(H) at high fields is attributed to the density increase in the columnar flux pinning centers.

Original language	English
Pages (from-to)	2787-2789
Number of pages	3
Journal	IEEE Transactions on Applied Superconductivity
Volume	15
Issue number	2 PART III
DOIs	https://doi.org/10.1109/TASC.2005.848213
State	Published - Jun 2005

Keywords

Columnar defects
Critical current
Flux pinning
YBCO coated conductors

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10.1109/TASC.2005.848213

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title = "Jc(H) crossover in YBCO thick films and Bi2223/Ag tapes with columnar defects",

abstract = "We report a study of critical current density Jc as a function of temperature T, magnetic field H, and film thickness d in a series of high quality YBa2Cu3O7-δ (YBCO) films. A crossover in the thickness dependence of Jc(H) curves was observed for T > 50 K, where thinner film carries significantly lower Jc(H) than thicker film at high fields, while the opposite was observed at low fields. This Jc(H) crossover behavior seems to be a general feature for a superconducting system with a spectrum of pinning density, whose trend opposes to the effective volume faction for Jc. This generalization is supported by examining Jc(H) crossover behaviors observed earlier in the Bi2Sr2Ca2Cu3O 10+δ(Bi2223)/Ag tapes irradiated with 5.8 GeV Pb ions, where enhanced Jc(H) at high fields is attributed to the density increase in the columnar flux pinning centers.",

keywords = "Columnar defects, Critical current, Flux pinning, YBCO coated conductors",

author = "Qiang Li and M. Suenaga and Foltyn, \{S. R.\} and H. Wang",

year = "2005",

month = jun,

doi = "10.1109/TASC.2005.848213",

language = "English",

volume = "15",

pages = "2787--2789",

journal = "IEEE Transactions on Applied Superconductivity",

issn = "1051-8223",

number = "2 PART III",

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TY - JOUR

T1 - Jc(H) crossover in YBCO thick films and Bi2223/Ag tapes with columnar defects

AU - Li, Qiang

AU - Suenaga, M.

AU - Foltyn, S. R.

AU - Wang, H.

PY - 2005/6

Y1 - 2005/6

N2 - We report a study of critical current density Jc as a function of temperature T, magnetic field H, and film thickness d in a series of high quality YBa2Cu3O7-δ (YBCO) films. A crossover in the thickness dependence of Jc(H) curves was observed for T > 50 K, where thinner film carries significantly lower Jc(H) than thicker film at high fields, while the opposite was observed at low fields. This Jc(H) crossover behavior seems to be a general feature for a superconducting system with a spectrum of pinning density, whose trend opposes to the effective volume faction for Jc. This generalization is supported by examining Jc(H) crossover behaviors observed earlier in the Bi2Sr2Ca2Cu3O 10+δ(Bi2223)/Ag tapes irradiated with 5.8 GeV Pb ions, where enhanced Jc(H) at high fields is attributed to the density increase in the columnar flux pinning centers.

AB - We report a study of critical current density Jc as a function of temperature T, magnetic field H, and film thickness d in a series of high quality YBa2Cu3O7-δ (YBCO) films. A crossover in the thickness dependence of Jc(H) curves was observed for T > 50 K, where thinner film carries significantly lower Jc(H) than thicker film at high fields, while the opposite was observed at low fields. This Jc(H) crossover behavior seems to be a general feature for a superconducting system with a spectrum of pinning density, whose trend opposes to the effective volume faction for Jc. This generalization is supported by examining Jc(H) crossover behaviors observed earlier in the Bi2Sr2Ca2Cu3O 10+δ(Bi2223)/Ag tapes irradiated with 5.8 GeV Pb ions, where enhanced Jc(H) at high fields is attributed to the density increase in the columnar flux pinning centers.

KW - Columnar defects

KW - Critical current

KW - Flux pinning

KW - YBCO coated conductors

UR - https://www.scopus.com/pages/publications/22044452842

U2 - 10.1109/TASC.2005.848213

DO - 10.1109/TASC.2005.848213

M3 - Article

AN - SCOPUS:22044452842

SN - 1051-8223

VL - 15

SP - 2787

EP - 2789

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 2 PART III

ER -

J_c(H) crossover in YBCO thick films and Bi2223/Ag tapes with columnar defects

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Keywords

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