skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Experimental magnetization evidence for two superconducting phases in Bi bicrystals with large crystallite disorientation angles

Abstract

Magnetization measurements prove that the magnetic properties of large-angle ({theta}>30 deg. ) bismuth bicrystals with a crystallite interface (CI) of twisting types essentially differ from well-known results on single-crystalline specimens. Two superconducting phases with T{sub c}{approx}8.4 K and {approx}4.3 K were observed at the CI of bicrystals while ordinary rhombohedral Bi is not a superconductor. We conclude that these phases have to do with the central part and the adjacent layers of the CI of bicrystals.

Authors:
 [1];  [2];  [3];  [2];  [3];  [4];  [3];  [5]
  1. Institute of Applied Physics, Academy of Sciences of Moldova, MD-2028 Chisinau (Moldova, Republic of)
  2. (Poland)
  3. International Laboratory of High Magnetic Fields and Low Temperatures, PL-53421 Wroclaw (Poland)
  4. (Germany)
  5. Institute of Low Temperatures and Structural Research, Polish Academy of Sciences, Wroclaw (Poland)
Publication Date:
OSTI Identifier:
20788035
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevB.73.132507; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BICRYSTALS; BISMUTH; INTERFACES; LAYERS; MAGNETIC PROPERTIES; MAGNETIZATION; MONOCRYSTALS; ORIENTATION; TRANSITION TEMPERATURE; TYPE-II SUPERCONDUCTORS

Citation Formats

Muntyanu, F. M., International Laboratory of High Magnetic Fields and Low Temperatures, PL-53421 Wroclaw, Gilewski, A., Magnet, PL-50421 Wroclaw, Nenkov, K., Leibniz-Institut fur Festkorper und Werkstofforschung, Dresden, Warchulska, J., and Zaleski, A. J.. Experimental magnetization evidence for two superconducting phases in Bi bicrystals with large crystallite disorientation angles. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.73.1.
Muntyanu, F. M., International Laboratory of High Magnetic Fields and Low Temperatures, PL-53421 Wroclaw, Gilewski, A., Magnet, PL-50421 Wroclaw, Nenkov, K., Leibniz-Institut fur Festkorper und Werkstofforschung, Dresden, Warchulska, J., & Zaleski, A. J.. Experimental magnetization evidence for two superconducting phases in Bi bicrystals with large crystallite disorientation angles. United States. doi:10.1103/PHYSREVB.73.1.
Muntyanu, F. M., International Laboratory of High Magnetic Fields and Low Temperatures, PL-53421 Wroclaw, Gilewski, A., Magnet, PL-50421 Wroclaw, Nenkov, K., Leibniz-Institut fur Festkorper und Werkstofforschung, Dresden, Warchulska, J., and Zaleski, A. J.. Sat . "Experimental magnetization evidence for two superconducting phases in Bi bicrystals with large crystallite disorientation angles". United States. doi:10.1103/PHYSREVB.73.1.
@article{osti_20788035,
title = {Experimental magnetization evidence for two superconducting phases in Bi bicrystals with large crystallite disorientation angles},
author = {Muntyanu, F. M. and International Laboratory of High Magnetic Fields and Low Temperatures, PL-53421 Wroclaw and Gilewski, A. and Magnet, PL-50421 Wroclaw and Nenkov, K. and Leibniz-Institut fur Festkorper und Werkstofforschung, Dresden and Warchulska, J. and Zaleski, A. J.},
abstractNote = {Magnetization measurements prove that the magnetic properties of large-angle ({theta}>30 deg. ) bismuth bicrystals with a crystallite interface (CI) of twisting types essentially differ from well-known results on single-crystalline specimens. Two superconducting phases with T{sub c}{approx}8.4 K and {approx}4.3 K were observed at the CI of bicrystals while ordinary rhombohedral Bi is not a superconductor. We conclude that these phases have to do with the central part and the adjacent layers of the CI of bicrystals.},
doi = {10.1103/PHYSREVB.73.1},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 13,
volume = 73,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}
  • 2.2-GeV Au-ions irradiation is used to study the effect of columnar defects on the transport properties of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (Bi2212) bicrystals with high quality {ital c}-axis twist grain boundary. The studies show a similar increase in the irreversible temperature determined within the single crystals and across the grain boundaries after irradiation. However, the irradiation enhancement on the grain boundary critical current (I{sub c}) at low temperatures is small, compared to the more than an order of magnitude increase of single crystal I{sub c}. {copyright} {ital 1999 American Institute of Physics.}
  • Tunneling has been observed at the barrier formed by the intergrowth surface of the superconducting bicrystals BaPb/sub 1-x/Bi/sub x/O/sub 3/. It has been determined that this compound has a ratio 2..delta..(0)/kT/sub c/ = 3.6 +- 0.1 and that the differential-conductivity peak has a doublet structure.
  • Large depression of T{sub c} at 7{degree} [100] tilt grain boundaries was observed in bulk Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (Bi2212) bicrystals by measuring the zero-field electrical transport properties of the grain boundaries and the constituent single crystals over an extended range of currents and voltages. The T{sub c}-depressed region was determined to be around 20 nm, comparable to the width of the strain field associated with the observed array of grain-boundary dislocations. Superconducting coupling of the grain boundaries increases sharply as temperature decreases below the grain-boundary T{sub c}{congruent}68 K. {copyright} {ital 1997 American Institute of Physics.}
  • Thin films in the Bi-Sr-Ca-Cu-O system have been synthesized from liquid ethylhexanoate precursors by spin pyrolysis. An extensive solid-solution range was found for the two-Cu-layer phase through the study of c-axis- oriented, single-phase thin films fabricated on single- crystal, (100)-oriented, MgO substrates. All two-layer compositions were excess in Bi and deficient in Sr + Ca relative to the ideal 2212 composition and showed an overall cation deficiency. The solidus temperature and c lattice parameter were found to vary systematically with composition. Sharp superconductive transitions were obtained in the case of a number of different compositions with T{sub c} varying betweenmore » 72 and 84 K. Evidence for significant compositional heterogeneities within single-phase two-layer thin films was found and the implications for superconductivity are discussed. Compositions within the solid-solution range gave single-phase, c-axis-oriented films over a wide temperature range extending from 730{degrees}C to an upper, solidus (or peritectic) temperature (780{degrees} to 840{degrees}C) which is dependent on the initial starting composition. A model has been developed that describes the formation of the two-layer phase from a fugitive liquid.« less