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Title: Interlayer Coherence in Bi 2Sr 2CaCu 2O 8+y with Splayed Columnar Defects

Authors:
 [1];  [1];  [1];  [2];  [3]
  1. Kyoto University, Japan
  2. ORNL
  3. IBM T. J. Watson Research Center
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
932141
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physica C; Journal Volume: 463+465
Country of Publication:
United States
Language:
English

Citation Formats

Kato, T., Shibauchi, T., Matsuda, Y., Thompson, James R, and Krusin-Elbaum, L.. Interlayer Coherence in Bi2Sr2CaCu2O8+y with Splayed Columnar Defects. United States: N. p., 2007. Web. doi:10.1016/j.physc.2007.01.042.
Kato, T., Shibauchi, T., Matsuda, Y., Thompson, James R, & Krusin-Elbaum, L.. Interlayer Coherence in Bi2Sr2CaCu2O8+y with Splayed Columnar Defects. United States. doi:10.1016/j.physc.2007.01.042.
Kato, T., Shibauchi, T., Matsuda, Y., Thompson, James R, and Krusin-Elbaum, L.. Mon . "Interlayer Coherence in Bi2Sr2CaCu2O8+y with Splayed Columnar Defects". United States. doi:10.1016/j.physc.2007.01.042.
@article{osti_932141,
title = {Interlayer Coherence in Bi2Sr2CaCu2O8+y with Splayed Columnar Defects},
author = {Kato, T. and Shibauchi, T. and Matsuda, Y. and Thompson, James R and Krusin-Elbaum, L.},
abstractNote = {},
doi = {10.1016/j.physc.2007.01.042},
journal = {Physica C},
number = ,
volume = 463+465,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • We present evidence for entangled solid vortex matter in a glassy state in a layered superconductor Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} containing randomly splayed linear defects. The interlayer phase coherence(IPC) - probed by the Josephson plasma resonance - is enhanced at high temperatures, reflecting the recoupling of vortex liquid by the defects. At low temperatures in the vortex solid state, the interlayer coherence follows a boomerang-shaped reentrant temperature path with an unusual low field decrease in coherence, indicative of meandering vortices. This behavior suggests strongly suppressed IPC in this system, which may be explained by the vortex entanglement induced bymore » the columnar defects in the 'splayed-glass' state.« less
  • The authors studied the phase coherence in the vortex liquid state of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} with columnar defects (CDs) using Josephson plasma resonance. The phase coherence as a function of magnetic field is nonmonotonic in samples with higher density of CDs, and they observe multiple resonance peaks in a limited temperature range. The characteristic field H* for the enhancement of the phase coherence normalized by the matching field (B{sub {Phi}}) is constant between 1/5 and 1/3 for samples with larger B{sub {Phi}}, while H* is constant in samples with smaller B{sub {Phi}}. In samples with CDs introduced atmore » angles from the c-axis, H* is determined only by the density of CDs in the CuO{sub 2} layers. In a sample with CDs at 80{degree} from the c-axis, a large enhancement of the phase coherence was observed when the field is applied parallel to the direction of CDs and clear triple resonance peaks are observed.« less
  • Composite tapes of the superconductor Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8] on silver were irradiated with energetic [ital light] ions (0.8 GeV protons), creating extended splayed tracks [similar to]7 nm in diameter via fission of Bi nuclei. Magnetic hysteresis indicates large enhancements of persistent currents [ital J], especially at high fields and temperatures, and substantial expansion of the irreversible regime. The technique may be suitable for large scale applications due to the long range ([similar to]half meter) of fast protons.
  • No abstract prepared.
  • The Josephson plasma resonance and dc magnetization were investigated in a high-T{sub c} cuprate Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} (Bi-2212) containing columnar defects in order to clarify the detailed bahavior in the reversible region around the coupling transition of pancake vortices. We point out that the coupling transition line which separates decoupled and well-coupled pancake vortices is a temperature independent horizontal line on the H-T plane. This result indicates that the coupling transition is a field-induced phenomenon. We find that the rapid reduction of the interlayer phase correlation and the enhancement of the in-plane critical current density take place simultaneouslymore » at B=B{sup {asterisk}}, which is just below the coupling transition field B{sub cp}. This phenomenon may be interpreted as the field-induced acceleration of the decoupling of pancake vortices in the reversible region of Bi-2212 with columnar defects. B{sub cp} was rather smaller than B{sub {phi}}. From transmission electron microscopy, we infer that the inhomogeneous distribution of columnar defects may be related to the coupling transition field B{sub cp}{approximately}B{sub {phi}(eff)}, which was rather smaller than B{sub {phi}}. {copyright} {ital 1999} {ital The American Physical Society}« less