Crystal-field and exchange interactions of dilute Gd/sup 3+/ ions in Eu/sub 2/CuO/sub 4/

Journal Article · Tue Nov 01 04:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.8920· OSTI ID:6749511

Rao, D; Tovar, M; Oseroff, S B; Vier, D C; Schultz, S; Thompson, J D; Cheong, S; Fisk, Z

We have measured the electron-spin-resonance spectrum of Gd/sup 3+/ ions substituting for Eu ions in Eu/sub 2/CuO/sub 4/. The fine structure of the spectrum was partially resolved at room temperature and the individual transitions were completely separated below 100 K. The spectrum is described with a crystal-field effective Hamiltonian of tetragonal symmetry. The values obtained at low temperatures for the corresponding parameters are b/sub 2//sup 0/ = -486(7) x 10/sup -4/ cm/sup -1/, b/sub 4//sup 0/ = -32(2) x 10/sup -4/ cm/sup 1/, and chemically bondb/sub 4//sup 4/chemically bond = 790(50) x 10/sup -4/ cm/sup -1/. These parameters are only weakly temperature dependent. The measured effective g value is shifted from the free-ion value g = 1.992, indicating the existence of antiferromagnetic exchange interactions with the ions of the host.

• Research Organization: Physics Department, San Diego State University, San Diego, California 92182
• OSTI ID: 6749511
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:13; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL FIELD
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON SPIN RESONANCE
ENERGY-LEVEL TRANSITIONS
EUROPIUM COMPOUNDS
EUROPIUM OXIDES
FINE STRUCTURE
GADOLINIUM IONS
ION EXCHANGE
IONS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RESONANCE
SPIN EXCHANGE
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ZEEMAN EFFECT