Density-of-states-driven transition from superconductivity to ferromagnetism in Ce(Ru sub 1 minus x Rh sub x ) sub 3 B sub 2 : Scenario for an exchange-split Kondo resonance

Journal Article · Tue May 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.9013· OSTI ID:6974074

Allen, J W ^[1]; Maple, M B; Kang, J; Yang, K N ^[2]; Torikachvili, M S ^[3]; Lassailly, Y ^[4]; Ellis, W P ^[5]; Pate, B B; Lindau, I ^[6]

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1. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (USA)
2. Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, California 92093 (USA)
3. Department of Physics, San Diego State University, San Diego, California 92182 (USA)
4. Ecole Polytechnique, 91128 Palaiseau (France)
5. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (USA)
6. Stanford Synchrotron Radiation Laboratory, Stanford, California 94305 (USA)

We have investigated the interesting alloy system Ce(Ru{sub 1{minus}{ital x}}Rh{sub {ital x}}){sub 3}B{sub 2}, where the physical properties change from superconducting to ferromagnetic as {ital x} changes from 0 to 1. We report the results of transport, magnetic, crystallographic, and electron-spectroscopy measurements, and a theoretical analysis of the electron-spectroscopy data using the impurity Anderson Hamiltonian applied to the Ce 4{ital f} electrons. Superconductivity exists in the range 0{lt}{ital x}{lt}0.38, while ferromagnetism occurs in the range 0.84{lt}{ital x}{lt}1. Our studies of superconductivity and ferromagnetism in Ce(Ru{sub 1{minus}{ital x}}Rh{sub {ital x}}){sub 3}B{sub 2} show that ferromagnetism is associated with nearly trivalent Ce ions. We find that the alloying mechanism controlling the low-energy properties of this system is the transition-metal 4{ital d} density of states at the Fermi level, rather than any parameter directly connected to the 4{ital f} states, such as its binding energy, Coulomb interaction, or the average hybridization strength between the localized 4{ital f} and conduction electrons. We use this result to further elucidate our previously proposed exchange split-Kondo resonance model of the ferromagnetism near {ital x}=1.

• OSTI ID: 6974074
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 41:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM BORIDES
FERROMAGNETISM
SUPERCONDUCTIVITY
RHODIUM BORIDES
RUTHENIUM BORIDES
D STATES
ELECTRIC CONDUCTIVITY
ELECTRON SPECTRA
ENERGY DENSITY
F STATES
FERMI LEVEL
FLUCTUATIONS
HYBRIDIZATION
KONDO EFFECT
LOW TEMPERATURE
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
MEDIUM TEMPERATURE
STOICHIOMETRY
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
VALENCE
VERY LOW TEMPERATURE
BORIDES
BORON COMPOUNDS
CERIUM COMPOUNDS
ELECTRICAL PROPERTIES
ENERGY LEVELS
MAGNETIC PROPERTIES
MAGNETISM
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
RHODIUM COMPOUNDS
RUTHENIUM COMPOUNDS
SPECTRA
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
360204* - Ceramics
Cermets
& Refractories- Physical Properties