First flux-penetration fields in [ital L][sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4[minus][ital y]] single crystals

Journal Article · Mon Aug 01 00:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.3256· OSTI ID:6735851

Fabrega, L; Fontcuberta, J; Martinez, B; Pinol, S ^[1]

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1. Institut de Ciencia de Materials de Barcelona, Consejo Superior de Investigaciones Cientificas, Campus de la Universidat Autonoma de Barcelona, 08193 Bellaterra, Catalunya (Spain)

High-resolution measurements of low-field dc magnetization are used to obtain flux-penetration fields [ital H][sub [ital p]]([ital T]) along the two main crystallographic directions of several [ital L][sub 2[minus][ital x]]Ce[sub [ital x]]CuO[sub 4[minus][ital y]] ([ital L]=Pr,Nd,Sm) single crystals. The departure from the linearity of the virgin [ital M]([ital H]) curve and the appearance of remanence and magnetic relaxation are used to determine [ital H][sub [ital p]]. It is shown that [ital H][sub [ital p]]([ital T]) may not be safely identified with [ital H][sub [ital c]1]([ital T]) when [bold H][parallel][ital c]; the implications of these results are discussed in order to estimate the values of the fundamental superconducting quantities as the lower critical field, the penetration depth, the Ginzburg-Landau parameter, and the anisotropy in these electron-doped copper oxide superconductors.

• OSTI ID: 6735851
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:5; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALLOYS
CERIUM ADDITIONS
CERIUM ALLOYS
CHALCOGENIDES
COPPER COMPOUNDS
CRITICAL FIELD
CRYSTALS
CUPRATES
GINZBURG-LANDAU THEORY
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIZATION
MONOCRYSTALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SAMARIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS