Cooperative and local properties in the Kondo insulator YbB12

doi:10.1016/j.jmmm.2003.12.1236

Journal of Magnetism and Magnetic Materials

Volumes 272–276, Part 1, May 2004, Pages 75-76

https://doi.org/10.1016/j.jmmm.2003.12.1236 Get rights and content

Abstract

Disrupting coherence on the Yb sublattice produces significant changes on the magnetic spectral response of the Kondo insulator YbB₁₂, as evidenced by inelastic neutron scattering measurements on Yb_1−xLu_xB₁₂ solid solutions. However, the spin gap existing in pure YbB₁₂ is not suppressed by substitution of Lu for Yb.

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Cited by (1)

On the exceptional negative Seebeck effect in 3d-doped β-rhombohedral boron
2011, Solid State Sciences
Citation Excerpt :
The Kondo effect [1] has been observed in a variety of 3d, 4f and 5f intermetallic compounds typically consisting of a nonmagnetic metallic host with small quantities of transition-metal or rare-earth impurities forming strongly correlated electron systems [2–4]. These solids exhibit unusual temperature-dependent thermal, electrical and magnetic properties, in particular a high TEP (thermoelectric power) at very low temperatures (see e.g [5–11]). In β-rhombohedral boron as well, a high negative TEP can be achieved, this even at rather high temperatures, namely by interstitial doping with 3d atoms.
Interstitial doping with 3d-elements impact the electronic properties of β-rhombohedral boron significantly; in some cases high negative Seebeck coefficients occur. The explanation by simple charge transfer is excluded. We attribute these effects to the correlation among the diluted 3d atoms generating a specific system of electronic states in the band gap. The interaction with Ogitsu’s antiferromagnetic Ising model, describing the incomplete occupancy of regular B sites, is probable. Details depend on the kind of dopants, occupied sites, and occupancies. Very low V, Cr, and Ni contents evoke extraordinary high negative Seebeck coefficients at ambient conditions; e.g. VB₁₉₀: S = 450 μVK⁻¹ at 270 K, a shift of more than 1000 μVK⁻¹ compared with pure boron. Structural and electronic properties of B:V, B:Fe, B:Cu and some other 3d transition metal solid solutions in β-rhombohedral boron are discussed.

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Cooperative and local properties in the Kondo insulator YbB12

Abstract

J. Magn. Magn. Mater.

Physica B

J. Phys.: Condens. Matter

Phys. Rev. B

Cooperative and local properties in the Kondo insulator YbB₁₂