Wave-vector dependence of intermultiplet transitions in EuBa{sub 2}Cu{sub 3}O{sub x} (x=6.1 and 7): An inelastic neutron-scattering study

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.11629· OSTI ID:496736

Staub, U ^[1]; Osborn, R ^[2]; Balcar, E ^[3]; Soderholm, L ^[4]; Trounov, V ^[5]

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1. Swiss Light Source Project, Paul Scherrer Institute, CH-5232 Villigen PSI (Switzerland)
2. Material Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Atominstitut der Oesterreichischen Universitaeten, A-1020 Vienna (Austria)
4. Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
5. St. Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg, 188350 (Russia)

The momentum-transfer (Q) dependence of inelastic-neutron-scattering dipolar and higher multipolar CEF split transitions from Eu{sup 3+} in EuBa{sub 2}Cu{sub 3}O{sub x} (x=6.1 and 7) are calculated and, where possible, compared with the observations. For the transitions between the {sup 7}F{sub 0} and the {sup 7}F{sub 4} CEF split multiplets, distinct differences in the Q dependence between the different excitations is anticipated. Some of these transitions are expected to have relatively strong dipolar contributions. In order to perform these calculations, it was necessary to fit the transitions to a model crystal-field splitting scheme in order to determine the eigenfunctions and corresponding energy levels as input for the Q-dependence calculations. We found an unusually low-energy separation between the {sup 7}F{sub 0} ground state and the first excited {sup 7}F{sub 1} multiplet which is well understood due to two effects. First, the strong CEF interaction mixes the wave functions of states between different multiplets which leads to a reduction of the energy separation. Second, the free-ion parameters are slightly reduced, which could be understood by assuming a linear behavior with the average distance of the nearest-neighbor shell. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 496736
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
CRYSTAL FIELD
ENERGY-LEVEL TRANSITIONS
EUROPIUM OXIDES
HIGH-TC SUPERCONDUCTORS
INELASTIC SCATTERING
MOMENTUM TRANSFER
NEUTRON DIFFRACTION
ZEEMAN EFFECT