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Title: Initial magnetization and coupling nature of the high- T sub c grains in Bi-Pb-Sr-Ca-Cu-O

Abstract

The coupling between grains was studied through low-field ({lt}100 Oe) initial magnetization {ital M}({ital H}) on bulk samples of Bi-Pb-Sr-Ca-Cu-O with a single high-{ital T}{sub {ital c}} (110 K) phase prepared under different sintering times {ital t}{sub {ital s}}. The {ital M}({ital H}) shows a variation with changing {ital t}{sub {ital s}} due to the weak links between grains and its behavior is characterized by three threshold fields: {ital H}{sub 1}{sup {ital B}}, {ital H}{sub 2}{sup {ital B}}, and {ital H}{sub 3}{sup {ital B}}. The first flux entry into the sample along the grain boundaries due to flux creep occurs at {ital H}{sub 1}{sup {ital B}}, much lower than {ital H}{sub {ital c}1}{sup {perpendicular}} ({similar to}7 Oe at 77 K, {similar to}15 Oe at 0 K) for {bold H}{perpendicular} {ital c} axis determined from the {ital c}-axis-oriented tape with {ital J}{sub {ital c}}=5400 A/cm{sup 2} (77 K, {ital H}=0). Between {ital H}{sub 1}{sup {ital B}} and {ital H}{sub 2}{sup {ital B}}, {ital M}({ital H}) deviates from a straight line due to shielding of the sample volume; between {ital H}{sub 2}{sup {ital B}} and {ital H}{sub 3}{sup {ital B}} it falls on the Meissner line, an effect ascribed to electrically decoupledmore » grains. The first flux entry into the grains themselves occurs at {ital H}{sub 3}{sup {ital B}}, above which {ital M}({ital H}) is governed by the intragrain magnetic properties of an Abrikosov lattice. Prolonged sintering improves the weak links between the grains and suppresses both the flux creep at the grain boundaries and the electrical decoupling between grains, which opens transport current paths and leads to the rise in {ital T}{sub {ital c}}({rho}=0).« less

Authors:
;  [1];  [2]
  1. Department of Electrical and Electronic Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441, Japan (JP)
  2. Technical Research and Development Laboratories, Topy Industries Ltd., Akemi-cho, Toyohashi, Aichi 441, Japan (JP)
Publication Date:
OSTI Identifier:
5561684
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (USA)
Additional Journal Information:
Journal Volume: 43:13; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BISMUTH OXIDES; MAGNETIZATION; CALCIUM OXIDES; COPPER OXIDES; LEAD OXIDES; STRONTIUM OXIDES; GRAIN BOUNDARIES; HIGH-TC SUPERCONDUCTORS; MAGNETIC FLUX; ALKALINE EARTH METAL COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; CRYSTAL STRUCTURE; LEAD COMPOUNDS; MICROSTRUCTURE; OXIDES; OXYGEN COMPOUNDS; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Oota, A, Noji, H, and Ohba, K. Initial magnetization and coupling nature of the high- T sub c grains in Bi-Pb-Sr-Ca-Cu-O. United States: N. p., 1991. Web. doi:10.1103/PhysRevB.43.10455.
Oota, A, Noji, H, & Ohba, K. Initial magnetization and coupling nature of the high- T sub c grains in Bi-Pb-Sr-Ca-Cu-O. United States. https://doi.org/10.1103/PhysRevB.43.10455
Oota, A, Noji, H, and Ohba, K. Wed . "Initial magnetization and coupling nature of the high- T sub c grains in Bi-Pb-Sr-Ca-Cu-O". United States. https://doi.org/10.1103/PhysRevB.43.10455.
@article{osti_5561684,
title = {Initial magnetization and coupling nature of the high- T sub c grains in Bi-Pb-Sr-Ca-Cu-O},
author = {Oota, A and Noji, H and Ohba, K},
abstractNote = {The coupling between grains was studied through low-field ({lt}100 Oe) initial magnetization {ital M}({ital H}) on bulk samples of Bi-Pb-Sr-Ca-Cu-O with a single high-{ital T}{sub {ital c}} (110 K) phase prepared under different sintering times {ital t}{sub {ital s}}. The {ital M}({ital H}) shows a variation with changing {ital t}{sub {ital s}} due to the weak links between grains and its behavior is characterized by three threshold fields: {ital H}{sub 1}{sup {ital B}}, {ital H}{sub 2}{sup {ital B}}, and {ital H}{sub 3}{sup {ital B}}. The first flux entry into the sample along the grain boundaries due to flux creep occurs at {ital H}{sub 1}{sup {ital B}}, much lower than {ital H}{sub {ital c}1}{sup {perpendicular}} ({similar to}7 Oe at 77 K, {similar to}15 Oe at 0 K) for {bold H}{perpendicular} {ital c} axis determined from the {ital c}-axis-oriented tape with {ital J}{sub {ital c}}=5400 A/cm{sup 2} (77 K, {ital H}=0). Between {ital H}{sub 1}{sup {ital B}} and {ital H}{sub 2}{sup {ital B}}, {ital M}({ital H}) deviates from a straight line due to shielding of the sample volume; between {ital H}{sub 2}{sup {ital B}} and {ital H}{sub 3}{sup {ital B}} it falls on the Meissner line, an effect ascribed to electrically decoupled grains. The first flux entry into the grains themselves occurs at {ital H}{sub 3}{sup {ital B}}, above which {ital M}({ital H}) is governed by the intragrain magnetic properties of an Abrikosov lattice. Prolonged sintering improves the weak links between the grains and suppresses both the flux creep at the grain boundaries and the electrical decoupling between grains, which opens transport current paths and leads to the rise in {ital T}{sub {ital c}}({rho}=0).},
doi = {10.1103/PhysRevB.43.10455},
url = {https://www.osti.gov/biblio/5561684}, journal = {Physical Review, B: Condensed Matter; (USA)},
issn = {0163-1829},
number = ,
volume = 43:13,
place = {United States},
year = {1991},
month = {5}
}