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• W130222011 endingPage "4615" @default.
• W130222011 startingPage "4605" @default.
• W130222011 abstract "We have prepared samples in the ${mathrm{La}}_{1}$${mathrm{Ba}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{mathrm{x}}$ series with superconducting transition temperatures ${T}_{c}$ ranging from 23 to 72 K (onset temperatures from 43 to 88 K). Results from scanning-electron-microscopy characterization, x-ray diffraction analysis, thermogravimetric analysis, the temperature dependence of the resistivity, and temperature dependence of the magnetic susceptibility are presented. The samples with ${T}_{c}$ greater than 50 K are orthorhombic while samples with ${T}_{c}$ less than 50 K show tetragonal structure. The transition temperature is found to depend on the oxygen content x with an apparent peak near x=7. Our sample with the highest ${T}_{c}$ (72 K) had x=6.75. As x decreases, so does ${T}_{c}$, reaching 44 K when x=6.47. For oxygen content greater than 7, ${T}_{c}$ decreases rapidly to a value of 23 K when x=7.27. The room-temperature resistivity increases systematically from 0.8 to 7.9 mensuremath{Omega} cm as ${T}_{c}$ decreases from 72 to 27 K. The increase is resistivity in the normal state and the decrease in the resistivity ratio (${mathrm{ensuremath{rho}}}_{300phantom{rule{0ex}{0ex}}mathrm{K}}$/${mathrm{ensuremath{rho}}}_{mathrm{residual}}$ are interpreted in terms of disorder in the microscopic structure which suppresses ${T}_{c}$. The magnetic susceptibility of these samples separates into a Pauli susceptibility ${ensuremath{chi}}_{0}$ and a Curie-Weiss susceptibility C/(T-FTHETA), after the core contribution is subtracted. A systematic increase in ${ensuremath{chi}}_{0}$ and a decrease in the Curie constant C has been observed as ${T}_{c}$ varies from 23 to 72 K. This is interpreted as an increase in the density of states at the Fermi surface coupled with a disappearance of local magnetic moments. We interpret our experimental results in terms of two types of disorder: disordered oxygen vacancies and an additional disorder of the lanthanum and barium ions." @default.
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• W130222011 date "1988-09-01" @default.
• W130222011 modified "2023-09-27" @default.
• W130222011 title "Experimental study ofLa1Ba2Cu3Ox" @default.
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• W130222011 doi "https://doi.org/10.1103/physrevb.38.4605" @default.
• W130222011 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9946850" @default.
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