Anomalous ion-channeling behavior across the superconducting transition in high-T/sub c/ materials
Conference
·
OSTI ID:5809360
Axial channeling scans with minimum RBS yields of /le/2% were obtained for 1.5 MeV /sup 4/He ions incident along the c-axis in YBa/sub 2/Cu/sub 3/O/sub 7-/delta// and ErBa/sub 2/Cu/sub 3/O/sub 7-/delta// single crystals. Large variations in the FWHM of the (001) channeling dip were observed for temperatures between 30 and 300 K. An abrupt, /approximately/8% increase was measured as the temperature was lowered through the superconducting transition (T/sub c/); the relative increase across T/sub c/ in the width of the axial dip was even larger for angles of incidence less than the critical angle. A simple analytical procedure for polyatomic materials yields isotropic, average thermal vibrational amplitudes that agree well with considerably less precise neutron powder diffraction results on sintered samples. The individual contribution to the angular channeling dip from the row of Er and Ba atoms parallel to the c-axis can be isolated in the RBS scans of the Er compound. This separation reveals normal (Debye-type) behavior for atoms in the Er-Ba row, demonstrating that the anomalous changes are due solely to atomic displacements in the Cu-O row. Finally, x-ray studies using specimens with different O stoichiometries reveal that the anomalous change in the FWHM shifts in temperature in direct proportion to the change in T/sub c/.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5809360
- Report Number(s):
- CONF-890821-3; ON: DE89017677
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Mon Jun 12 00:00:00 EDT 1989
· Phys. Rev. Lett.; (United States)
·
OSTI ID:5676690
Shift of phonon anomaly with T sub c observed in (Y,Er)Ba sub 2 Cu sub 3 O sub 7 minus. delta. by ion channeling
Journal Article
·
Thu Nov 30 23:00:00 EST 1989
· Physical Review (Section) B: Condensed Matter; (USA)
·
OSTI ID:5117279
Phonon anomaly at T sub c in (Y/Er)Ba sub 2 Cu sub 3 O sub 7-. delta
Conference
·
Tue Oct 31 23:00:00 EST 1989
·
OSTI ID:5344955
Related Subjects
656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHANNELING
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ERBIUM COMPOUNDS
ERBIUM OXIDES
HELIUM IONS
ION CHANNELING
IONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHANNELING
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ERBIUM COMPOUNDS
ERBIUM OXIDES
HELIUM IONS
ION CHANNELING
IONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES