Abstract
THE defects in as-grown bulk YBa2Cu3O7 have been shown to act as weak flux pinning sites, leading to a reversible magnetization1, magnetization decay2 and non-zero resistivity3 in moderate magnetic fields at temperatures near the transition temperature, Tc. These effects limit the technological utility of the as-grown material3. This is not entirely surprising, as both single crystals and polycrystalline materials are grown under conditions expected to minimize the defect density, but the weak pinning in these materials has nevertheless raised the issue of a possible intrinsic limitation to the critical current density. Here we report the attainment of a critical current density, Jc, of ∼6 × 105 A cm-2 at 77 K and 9 kOe, in a single crystal of Yba2Cu3O7 irradiated with fast neutrons to introduce defects. (In both irradiated and unirradiated crystals, the critical current density was inferred by measuring the magnetic moment resulting from an induced persistent current.) This hundredfold enhancement of Jc relative to unirradiated crystals demonstrates that artificially induced defects can act as strong flux pinning sites, and analysis of the defects should increase our understanding of flux pinning in high-Tc superconductors.
| Original language | English |
|---|---|
| Pages (from-to) | 55-57 |
| Number of pages | 3 |
| Journal | Nature |
| Volume | 342 |
| Issue number | 6245 |
| DOIs | |
| State | Published - 1 Jan 1989 |
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Critical currents near 106 A cm-2 at 77 K in neutron-irradiated single-crystal YBa2Cu3O7. / Van Dover, R. B.; Gyorgy, E. M.; Schneemeyer, Lynn; Mitchell, J. W.; Rao, K. V.; Puzniak, R.; Waszczak, J. V.
In: Nature, Vol. 342, No. 6245, 01.01.1989, p. 55-57.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Critical currents near 106 A cm-2 at 77 K in neutron-irradiated single-crystal YBa2Cu3O7
AU - Van Dover, R. B.
AU - Gyorgy, E. M.
AU - Schneemeyer, Lynn
AU - Mitchell, J. W.
AU - Rao, K. V.
AU - Puzniak, R.
AU - Waszczak, J. V.
PY - 1989/1/1
Y1 - 1989/1/1
N2 - THE defects in as-grown bulk YBa2Cu3O7 have been shown to act as weak flux pinning sites, leading to a reversible magnetization1, magnetization decay2 and non-zero resistivity3 in moderate magnetic fields at temperatures near the transition temperature, Tc. These effects limit the technological utility of the as-grown material3. This is not entirely surprising, as both single crystals and polycrystalline materials are grown under conditions expected to minimize the defect density, but the weak pinning in these materials has nevertheless raised the issue of a possible intrinsic limitation to the critical current density. Here we report the attainment of a critical current density, Jc, of ∼6 × 105 A cm-2 at 77 K and 9 kOe, in a single crystal of Yba2Cu3O7 irradiated with fast neutrons to introduce defects. (In both irradiated and unirradiated crystals, the critical current density was inferred by measuring the magnetic moment resulting from an induced persistent current.) This hundredfold enhancement of Jc relative to unirradiated crystals demonstrates that artificially induced defects can act as strong flux pinning sites, and analysis of the defects should increase our understanding of flux pinning in high-Tc superconductors.
AB - THE defects in as-grown bulk YBa2Cu3O7 have been shown to act as weak flux pinning sites, leading to a reversible magnetization1, magnetization decay2 and non-zero resistivity3 in moderate magnetic fields at temperatures near the transition temperature, Tc. These effects limit the technological utility of the as-grown material3. This is not entirely surprising, as both single crystals and polycrystalline materials are grown under conditions expected to minimize the defect density, but the weak pinning in these materials has nevertheless raised the issue of a possible intrinsic limitation to the critical current density. Here we report the attainment of a critical current density, Jc, of ∼6 × 105 A cm-2 at 77 K and 9 kOe, in a single crystal of Yba2Cu3O7 irradiated with fast neutrons to introduce defects. (In both irradiated and unirradiated crystals, the critical current density was inferred by measuring the magnetic moment resulting from an induced persistent current.) This hundredfold enhancement of Jc relative to unirradiated crystals demonstrates that artificially induced defects can act as strong flux pinning sites, and analysis of the defects should increase our understanding of flux pinning in high-Tc superconductors.
UR - http://www.scopus.com/inward/record.url?scp=33751248470&partnerID=8YFLogxK
U2 - 10.1038/342055a0
DO - 10.1038/342055a0
M3 - Article
VL - 342
SP - 55
EP - 57
JO - Nature
JF - Nature
SN - 0028-0836
IS - 6245
ER -