Phase separation to antiferromagnetic and superconducting domains in oxygen-rich single-crystal La[sub 2]CuO[sub 4+[ital x]]: Magnetic and structural neutron-diffraction studies
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
We report on magnetic and structural neutron-diffraction studies of single-crystal La[sub 2]CuO[sub 4+[ital x]] versus temperature. The low-temperature diffraction data are consistent with the coexistence of two structurally related phases: nearly stoichiometric, antiferromagnetic (AF) domains, with average domain diameter [similar to]500 A in the CuO[sub 2] plane, and oxygen-rich, metallic, and superconducting domains. The ordered magnetic moment in the AF domains does not saturate at 10 K, and is on average, [mu]=(0.3[plus minus]0.05)[mu][sub [ital B]]/Cu atom. The phase-separation transition to these two phases occurs at [ital T][sub PS]=260[plus minus]5 K, which is about 15 K higher than the Neel temperature, [ital T][sub [ital N]]=245[plus minus]3 K. The value of [ital T][sub PS] is identical within the errors with that (259[plus minus]2 K) found previously from specific-heat measurements on the same crystal. The structural properties of the single crystal are discussed and compared to those of polycrystalline oxygen-rich La[sub 2]CuO[sub 4+[ital x]].
- DOE Contract Number:
- W-7405-ENG-82; AC04-76DP00789
- OSTI ID:
- 5049508
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 49:13; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER OXIDES
SUPERCONDUCTIVITY
LANTHANUM OXIDES
DOMAIN STRUCTURE
MAGNETIC PROPERTIES
MONOCRYSTALS
NEUTRON DIFFRACTION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTALS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties