Preparation and transport properties of single-phase TlBa[sub 1+[ital x]]La[sub 1[minus][ital x]]CuO[sub 5] (0[le][ital x][le]0. 5)

Journal Article · Thu Sep 01 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.6402· OSTI ID:6716182

Manako, T; Kubo, Y ^[1]

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1. Fundamental Research Laboratories, NEC Corporation, 34, Miyukigaoka, Tsukuba, Ibaraki, 305 (Japan)

The preparation of polycrystalline TlBa[sub 1+[ital x]]La[sub 1[minus][ital x]]CuO[sub 5] ([ital x]=0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) is investigated using Tl-free precursors. Single-phase samples are obtained except for [ital x]=0.5, in which a small amount of impurity phase is detected. Compositional and structural analyses confirm good homogeneity of the Ba and La distribution in each sample. In this system, hole-carrier doping increases with increasing [ital x]. The sample with [ital x]=0, TlBaLaCuO[sub 5], shows semiconductive resistivity ([rho]) and a [ital T]-independent Hall coefficient ([ital R][sub [ital H]]), indicating two-dimensional (2D) variable range hopping. As [ital x] increases, the resistivity becomes metallic and superconductivity is observed for 0.1[le][ital x][le]0.4, with a maximum [ital T][sub [ital c]] value of 45 K at [ital x]=0.2. For [ital x]=0.5, the sample is metallic but not superconducting. In all metallic samples (0.1[le][ital x][le]0.5), [ital R][sub [ital H]] has a broad maximum at about 100 K, as seen in most high-[ital T][sub [ital c]] cuprates. The inverse Hall mobility, [mu][sub [ital H]][sup [minus]1][equivalent to][rho]/[ital R][sub [ital H]], roughly obeys a [ital T][sup 2] dependence regardless of the [ital T][sub [ital c]] value, which is widely observed in other oxide superconductors.

• OSTI ID: 6716182
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:9; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CARRIER MOBILITY
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
CUPRATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HALL EFFECT
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MATERIALS
MOBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
RARE EARTH COMPOUNDS
SEMICONDUCTOR MATERIALS
STOICHIOMETRY
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE