Magnetic Field Effect on Yb-Based Heavy Fermions near Magnetic-Nonmagnetic Transition

• Authors: T. Mito , T. Koyama , K. Nakagawara , T. Ishida , K. Ueda , T. Kohara , K. Matsubayashi , Y. Saiga
• Languages of publication: EN

Abstracts

EN

Recently magnetic field effects on f electron systems in the vicinity of a magnetic-nonmagnetic transition have attracted much interest. In order to investigate the mechanism of field induced modifications in heavy fermion systems, especially in terms of valent degrees of freedom, we have carried out the X-ray absorption spectroscopy measurement on the newly discovered heavy fermion material YbCo_2Zn_{20} which exhibits extremely large specific heat at low temperatures. Our results show that the Yb valence of YbCo_2Zn_{20} is very close to +3 over the whole temperature range of measurement. Besides, no significant change in the absorption spectrum was observed up to the field of 10 T. This contrasts to the previously reported strong field dependence in the resistivity, followed by an expansion of the Fermi liquid regime with increasing field. The obtained results therefore lead to the conclusion that the valent degrees of freedom play a minor role in the strong field dependence of the heavy fermion systems in this compound.

Keywords

EN

71.27.+a; 75.30.Kz; 75.30.Mb; 78.70.Dm

Discipline

• 78.70.Dm: X-ray absorption spectra
• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 75.30.Mb: Valence fluctuation, Kondo lattice, and heavy-fermion phenomena(see also 71.27.+a Strongly correlated electron systems, heavy fermions; for heavy-fermion superconductors, see 74.70.Tx)
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 5
• Pages: 870-872

Dates

published

2010-11

Contributors

author

T. Mito

• Graduate School of Material Science, University of Hyogo, Hyogo 678-1297, Japan

author

T. Koyama

• Graduate School of Material Science, University of Hyogo, Hyogo 678-1297, Japan

author

K. Nakagawara

• Graduate School of Material Science, University of Hyogo, Hyogo 678-1297, Japan

author

T. Ishida

• Graduate School of Material Science, University of Hyogo, Hyogo 678-1297, Japan

author

K. Ueda

• Graduate School of Material Science, University of Hyogo, Hyogo 678-1297, Japan

author

T. Kohara

• Graduate School of Material Science, University of Hyogo, Hyogo 678-1297, Japan

author

K. Matsubayashi

• Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

author

Y. Saiga

• Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

References

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Identifiers

DOI

10.12693/APhysPolA.118.870