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 00:00:00 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), Vol. 50:9; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

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