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Magnetic properties of superconducting Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Zn{sub x}]{sub 3}O{sub 7}; Magnetische Eigenschaften des supraleitenden Systems Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Z{sub nx}]{sub 3}O{sub 7}

Thesis/Dissertation:

Abstract

Grain aligned powder-samples of Zn doped YBaCuO (x {<=} 5%) have been investigated by measuring the dc-magnetization with a SQUID-magnetometer. Field dependend determination of the Meissner-fraction yields full bulk superconductivity for all samples (Meissner-fraction > 85% at B{sub e} = 0,1G, referred to ideal shielding). Sinter-samples, however, allow only uncertain estimations of the superconducting volume fraction (Meissner-fraction < 40% at B{sub e} > 0,01G). The magnetic penetration depths are determined by the analysis of the temperature dependence of the magnetization at low magnetic fields. With increasing Zn-concentration there is a strong increase of {lambda}{sub ab} and {lambda}{sub c} while the anisotropy {lambda}{sub c}/{lambda}{sub ab} decreases. These effects are supported by the analysis of the reversible magnetization at high fields (B{sub e} > 1T). The experimental findings (concentration dependency of {lambda}, Tc, {Delta}c{sub p} and p(T)) are in good agreement with theoretical predictions on gapless-superconductivity and therefore give strong evidence that the substitution of Cu by Zn leads to gapless-superconductivity. (orig.). [Deutsch] Zn-dotierte YBaCuO-Pulverproben (x {<=} 5%), die c-Achsen-texturiert waren, wurden mittels eines SQUID-Magnetometers hinsichtlich ihres dc-Magnetisierungsverhaltens im supraleitenden Zustand untersucht. Magnetfeldabhaengige Messungen des Meissner-Anteils ergaben eine vom Zn-Gehalt unabhaengige vollstaendige Volumensupraleitung (Meissner-Anteil > 85% bei B{sub a} = 0.1G, bezogen  More>>
Authors:
Publication Date:
May 01, 1992
Product Type:
Thesis/Dissertation
Report Number:
KFK-4996
Reference Number:
SCA: 360207; PA: DEN-93:000053; SN: 93000915571
Resource Relation:
Other Information: TH: Diss.; PBD: May 1992
Subject:
36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; MAGNETIZATION; DOPED MATERIALS; YTTRIUM OXIDES; BARIUM OXIDES; COPPER OXIDES; CUPRATES; ZINC ADDITIONS; PENETRATION DEPTH; 360207
OSTI ID:
10111036
Research Organizations:
Kernforschungszentrum Karlsruhe GmbH (Germany). Inst. fuer Technische Physik; Karlsruhe Univ. (T.H.) (Germany). Fakultaet fuer Physik
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Other: ON: DE93750399; TRN: DE9300053
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
77 p.
Announcement Date:
Jun 30, 2005

Thesis/Dissertation:

Citation Formats

Rudolf, B. Magnetic properties of superconducting Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Zn{sub x}]{sub 3}O{sub 7}; Magnetische Eigenschaften des supraleitenden Systems Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Z{sub nx}]{sub 3}O{sub 7}. Germany: N. p., 1992. Web.
Rudolf, B. Magnetic properties of superconducting Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Zn{sub x}]{sub 3}O{sub 7}; Magnetische Eigenschaften des supraleitenden Systems Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Z{sub nx}]{sub 3}O{sub 7}. Germany.
Rudolf, B. 1992. "Magnetic properties of superconducting Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Zn{sub x}]{sub 3}O{sub 7}; Magnetische Eigenschaften des supraleitenden Systems Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Z{sub nx}]{sub 3}O{sub 7}." Germany.
@misc{etde_10111036,
title = {Magnetic properties of superconducting Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Zn{sub x}]{sub 3}O{sub 7}; Magnetische Eigenschaften des supraleitenden Systems Y{sub 1}Ba{sub 2}[Cu{sub 1-x}Z{sub nx}]{sub 3}O{sub 7}}
author = {Rudolf, B}
abstractNote = {Grain aligned powder-samples of Zn doped YBaCuO (x {<=} 5%) have been investigated by measuring the dc-magnetization with a SQUID-magnetometer. Field dependend determination of the Meissner-fraction yields full bulk superconductivity for all samples (Meissner-fraction > 85% at B{sub e} = 0,1G, referred to ideal shielding). Sinter-samples, however, allow only uncertain estimations of the superconducting volume fraction (Meissner-fraction < 40% at B{sub e} > 0,01G). The magnetic penetration depths are determined by the analysis of the temperature dependence of the magnetization at low magnetic fields. With increasing Zn-concentration there is a strong increase of {lambda}{sub ab} and {lambda}{sub c} while the anisotropy {lambda}{sub c}/{lambda}{sub ab} decreases. These effects are supported by the analysis of the reversible magnetization at high fields (B{sub e} > 1T). The experimental findings (concentration dependency of {lambda}, Tc, {Delta}c{sub p} and p(T)) are in good agreement with theoretical predictions on gapless-superconductivity and therefore give strong evidence that the substitution of Cu by Zn leads to gapless-superconductivity. (orig.). [Deutsch] Zn-dotierte YBaCuO-Pulverproben (x {<=} 5%), die c-Achsen-texturiert waren, wurden mittels eines SQUID-Magnetometers hinsichtlich ihres dc-Magnetisierungsverhaltens im supraleitenden Zustand untersucht. Magnetfeldabhaengige Messungen des Meissner-Anteils ergaben eine vom Zn-Gehalt unabhaengige vollstaendige Volumensupraleitung (Meissner-Anteil > 85% bei B{sub a} = 0.1G, bezogen auf das ideale Abschirmverhalten). Sinterproben liessen im Gegensatz dazu nur sehr unbestimmte Aussagen ueber den supraleitenden Volumenanteil zu (Meissner-Anteil < 40% bei B{sub a} > 0,01G). Die magnetischen Eindringtiefen wurden aus der Analyse der temperaturabhaengigen Magnetisierung bei niedrigen Magnetfeldern ermittelt. Mit steigender Zn-Konzentration steigen {lambda}{sub ab} und {lambda}{sub c} stark an, wobei die Anisotropie {lambda}{sub c}/{lambda}{sub ab} abnimmt. Diese Ergebnisse werden durch die Analyse der reversiblen Magnetisierung bei hohen Magnetfeldern (B{sub a} > 1T)) gestuetzt. Die experimentellen Beobachtungen (Konzentrationsabhaengigkeit von {lambda}, T{sub c}, {Delta}c{sub p} und p(T) stimmen sehr gut mit theoretischen Vorhersagen zur `gapless`-Supraleitung ueberein und sind damit ein starker Hinweis dafuer, dass durch die Substitution von Cu durch Zn ein Supraleiter ohne Energieluecke entsteht. (orig.).}
place = {Germany}
year = {1992}
month = {May}
}