Raman spectra, superconductivity, and structure of Co-substituted YBa sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.6787· OSTI ID:5375275

Kakihana, M; Borjesson, L ^[1]; Eriksson, S ^[2]; Svedlindh, P; Norling, P ^[3]

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1. Department of Physics, Chalmers University of Technology, S-412 96 Gothenburg, Sweden (SE)
2. Department of Inorganic Chemistry, Chalmers University of Technology, S-412 96 Gothenburg, Sweden
3. Uppsala University, Institute of Technology, Box 534, S-751 21 Uppsala, Sweden

A systematic Raman spectroscopic investigation has been performed on YBa{sub 2}Cu{sub 3{minus}{ital x}}Co{sub {ital x}}O{sub 7{minus}{delta}} ceramic samples of different Co content {ital x} in the interval 0{le}{ital x}{le}0.6. The structure and the superconducting properties of the samples have been carefully characterized by x-ray diffraction, magnetic susceptibility, and resistivity measurements. It is found that the frequency of the axial stretching vibration of O(4) at 502 cm{sup {minus}1} decreases, the frequency of the Cu(2)-O(2),O(3) in-phase bending vibration at 440 cm{sup {minus}1} increases, and the frequency of the Cu(2)-O(2),O(3) out-of-phase bending vibration at 335 cm{sup {minus}1} remains constant for increasing Co concentration. The dependencies of the frequencies as well as of the intensities of these vibrational modes on cobalt substitution are reminiscent of the behavior of the corresponding modes for pure YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} of increasing oxygen deficiency. It is proposed that the frequency of this mode is directly dependent on the free-charge carrier concentration and is sensitive to the charge balance between the chains and the planes. Moreover, the resultant changes of the vibrational modes on Co substitution provide additional evidence for the mode assignments of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}

• OSTI ID: 5375275
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:10; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

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
BARIUM COMPOUNDS
BARIUM OXIDES
CARRIER DENSITY
CHALCOGENIDES
COBALT COMPOUNDS
COBALT OXIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FREQUENCY DEPENDENCE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OSCILLATION MODES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
RAMAN SPECTRA
SCATTERING
SPECTRA
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES