Electronic properties of Sr/sub 14/Cu/sub 24/O/sub 41/
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
Crystals of orthorhombicSr/sub 14/Cu/sub 24/O/sub 41/ are semiconducting,with an activation energy of 0.18(2) eV for conduction along /ital c/, the direction lying parallel to both the (Cu/sub 2/O/sub 3/) planes and the (CuO/sub 2/) chains. The magnetic susceptibility above 80 K follows a Curie-Weiss law with /theta/=/minus/95 K and/ital p//sub /ital eff//=0.65/mu//sub B//Cu in the ac plane and/theta/=/minus/190 and /ital p//sub /ital eff//=0.94/mu//sub B//Cu along/ital b/, the direction perpendicular to the (Cu/sub 2/O/sub 3/) planes and the (CuO/sub 2/) chains. There is an indication of antiferromagnetic order below /ital T//sub /ital N//=60 K, and a Curiecontribution at low temperature due to localized free spins (0.4(1) with/ital S/=(1/2 per formula)). The specific heat measured in the range2--12 K is of the form /ital AT//sup /minus/2/+/gamma/T+/beta/T/sup 3/,where /ital A/=1080 mJ K/mole, /gamma/=100mJ/mole K/sup 2/, and /beta/=5.93mJ/mole K/sup 3/. A 5-T magnetic field greatly enhances the low-temperature specific heat, an effect which is attributed to the localizedstates with /ital S/=(1/2). The linear term is attributed to alocalized density of states with no net spin, possibly associated with peroxideions. The relevance of these results to the low-temperature specific heat ofcopper-oxide superconductors is discussed.
- Research Organization:
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598(US)
- OSTI ID:
- 5973285
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 40:1; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LATTICE PARAMETERS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SEMICONDUCTOR MATERIALS
SPECIFIC HEAT
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LATTICE PARAMETERS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SEMICONDUCTOR MATERIALS
SPECIFIC HEAT
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE