Published May 7, 2003 | Version v1
Journal article Metadata-only

Magnetoresistance and magnetothermopower properties of Bi/Ca/Co/O and Bi(Pb)/Ca/Co/O misfit layer cobaltites

Creators

  • 1. Laboratoire CRISMAT, UMR CNRS ISMRA 6508, 6 bd Marechal Juin, 14050 CAEN Cedex (France)
  • 2. Solid State Physics Laboratory, Material Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen (Netherlands)

Description

Two new compounds of the Bi/Ca/Co/O and Bi(Pb)/Ca/Co/O systems have been prepared. Their structure is built up from the intergrowth of four rock-salt-type layers and one [CoO2 ] hexagonal layer. Both cobaltites exhibit large thermopower values (S300K ∼ 140 μV K-1), low resistivity values (ρ300K = 40-60 mΩ cm) and small thermal conductivities (κ300K ∼ 1 W K-1 m-1). Furthermore, these compounds exhibit a negative magnetoresistance, (MR = ρH - ρH0/ρH=0), reaching, at 2.5 K, - 85% in 7 T for the Bi/Ca/Co/O misfit cobaltite. A large negative magnetothermopower is also found for these cobaltites in the same temperature range. A qualitative explanation of the observed behaviour is proposed

Availability note (English)

Available online at http://stacks.iop.org/0953-8984/15/2711/c31723.pdf or at the Web site for the Journal of Physics. Condensed Matter (ISSN 1361-648X) http://www.iop.org/

Additional details

Identifiers

URL
http://stacks.iop.org/0953-8984/15/2711/c31723.pdf; http://www.iop.org/;
DOI
10.1088/0953-8984/15/17/323;
PII
S0953-8984(03)55348-6;

Publishing Information

Journal Title
Journal of Physics. Condensed Matter
Journal Volume
15
Journal Issue
17
Journal Page Range
p. 2711-2723
ISSN
0953-8984
CODEN
JCOMEL

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
34054189
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
BISMUTH; CALCIUM; COBALT; COBALT OXIDES; HEXAGONAL LATTICES; INTERFACES; LAYERS; MAGNETORESISTANCE; OXYGEN; TEMPERATURE DEPENDENCE; THERMAL CONDUCTIVITY
Descriptors DEC
ALKALINE EARTH METALS; CHALCOGENIDES; COBALT COMPOUNDS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; METALS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS