Electrical transport across grain boundaries in bicrystals of YBa2Cu3O7$δ$

Larbalestier, D. C.; Babcock, S. E.; Cai, X. Y.; Field, M. B.; Gao, Y.; Heinig, N. F.; Kaiser, D. L.; Merkle, K.; Williams, L. K.; Zhang, N.

doi:10.1016/0921-4534(91)91992-d

Electrical transport across grain boundaries in bicrystals of YBa₂Cu₃O_7$$δ$$

Conference · Mon Jul 22 04:00:00 EDT 1991 · Physica. C, Superconductivity

DOI:https://doi.org/10.1016/0921-4534(91)91992-d· OSTI ID:5329130

Larbalestier, D. C. ^[1]; Babcock, S. E. ^[1]; Cai, X. Y. ^[1]; Field, M. B. ^[1]; Gao, Y. ^[2]; Heinig, N. F. ^[1]; Kaiser, D. L. ^[3]; Merkle, K. ^[2]; Williams, L. K. ^[1]; Zhang, N. ^[1]

Univ. of Wisconsin, Madison, WI (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Wisconsin, Madison, WI (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Wisconsin, Madison, WI (United States)

The superconducting properties of about 20 bulk-scale flux-grown bicrystals of YBa₂Cu₃O_7-δ have been measured in order to deduce the nature of the coupling across their grain boundaries. Bicrystals with two types of misorientation relationship were studied: (i) θ [001] (C-type) and (ii) 90° [010] plus an additional rotation about the a_I | c_II axis (P-type). A general trend for a transition from flux pinning (FP) to Josephson Junction (JJ) to resistive (R) behavior was observed as the misorientation angle increased. However, FP character was observed well into the high-angle regime, in particular, for P-type bicrystals, and JJ behavior was observed at as low as 10° [001]. The J_α values of two bicrystals were increased by a second oxygen anneal. In one case (28° [001] boundary), extended oxygenation produced a change form JJ to mixed JJ/FP behavior, markedly raising the transport critical current density (J_α) at all fields. HRTEM has been performed on two of the same bicrystals which were electromagnetically characterized. A thin second phase layer unobservable by conventional TEM was observed in a resistive boundary, whereas no such phase was detected at a JJ boundary. We conclude that the character of the boundary cannot be predicted either from its misorientation angle or the magnitude of its J_c.

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)

DOE Contract Number:: W-31109-ENG-38

OSTI ID:: 5329130

Report Number(s):: ANL/CP--74017; CONF-910736--22; ON: DE91018588; CNN: DMR88-09854; DMR89-11332

Conference Information:: Journal Name: Physica. C, Superconductivity Journal Volume: 185-189

Country of Publication:: United States

Language:: English

References (9)

Weak-link-free behaviour of high-angle YBa2Cu3O7–δ grain boundaries in high magnetic fields Babcock, S. E.; Cai, X. Y.; Kaiser, D. L. Nature, Vol. 347, Issue 6289 https://doi.org/10.1038/347167a0	journal	September 1990
Special grain boundaries in YBa2Cu3O7 Smith, D. A.; Chisholm, M. F.; Clabes, J. Applied Physics Letters, Vol. 53, Issue 23 https://doi.org/10.1063/1.100520	journal	December 1988
The nature of [001] tilt grain boundaries in YBa₂Cu₃O_7−x Gayle, Frank W.; Kaiser, Debra L. Journal of Materials Research, Vol. 6, Issue 5 https://doi.org/10.1557/JMR.1991.0908	journal	May 1991
Superconducting transport properties of grain boundaries in YBa 2 Cu 3 O 7 bicrystals Dimos, D.; Chaudhari, P.; Mannhart, J. Physical Review B, Vol. 41, Issue 7 https://doi.org/10.1103/PhysRevB.41.4038	journal	March 1990
Oxygen-defect flux pinning, anomalous magnetization and intra-grain granularity in YBa2Cu307–δ Daeumling, M.; Seuntjens, J. M.; Larbalestier, D. C. Nature, Vol. 346, Issue 6282 https://doi.org/10.1038/346332a0	journal	July 1990
Evidence for local composition variations within YBa2Cu3O7−δ grain boundaries Babcock, S. E.; Larbalestier, D. C. Applied Physics Letters, Vol. 55, Issue 4 https://doi.org/10.1063/1.102422	journal	July 1989
Structural origin of reduced critical currents at YBa2Cu3O7–δ grain boundaries Chisholm, M. F.; Pennycook, S. J. Nature, Vol. 351, Issue 6321 https://doi.org/10.1038/351047a0	journal	May 1991
Growth of YBa ₂ Cu ₃ O _x single crystals Kaiser, D. L.; Holtzberg, F.; Scott, B. A. Applied Physics Letters, Vol. 51, Issue 13 https://doi.org/10.1063/1.98772	journal	September 1987
Observations and implications of grain boundary dislocation networks in high-angle YBa₂Cu₃O_7−δ grain boundaries Babcock, S. E.; Larbalestier, D. C. Journal of Materials Research, Vol. 5, Issue 5 https://doi.org/10.1557/JMR.1990.0919	journal	May 1990

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Electrical transport across grain boundaries in bicrystals of YBa2Cu3O7$$δ$$

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References (9)

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Electrical transport across grain boundaries in bicrystals of YBa₂Cu₃O_7$$δ$$