Reentrant Metal-Insulator Transition in Ca_{1-x}Eu_{x}B_{6}

• Authors: V. Glushkov , M. Anisimov , R. Baybakov , S. Demishev , V. Filippov , K. Flachbart , A. Kuznetsov , N. Shitsevalova , N. Sluchanko
• Languages of publication: EN

Abstracts

EN

Resistivity, Hall and Seebeck effects have been studied on single crystals of Ca_{1-x}Eu_{x}B_{6} (0 ≤ x ≤ 1) at temperatures 2-300 K and in magnetic fields up to 8 T. An insulating ground state is found to be limited by narrow range of Eu doping 0.6 ≤ x ≤ 0.8. This region is characterized by an enhanced colossal magnetoresistance (CMR), which reaches values of ρ(0)/ρ(7T) > 10^{6} for x = 0.63 at T < 10 K. Decreasing of Eu content in Ca_{1-x}Eu_{x}B_{6} below x* ≈ 0.6 restores the metallic ground state with moderate resistivity (ρ ~ 1 ÷ 5 mΩ·cm) and CMR amplitude (ρ(0)/ρ(7T) < 7). The second metal-insulator transition (MIT) in Ca_{1-x}Eu_{x}B_{6} is observed beyond the whole conductivity region found earlier in the narrow range of Eu doping (0.7 ≤ x ≤ 0.8). The correlation between the enhanced CMR amplitude, the onset of positive diffusive thermopower and the elevation of anomalous Hall effect, determined for Eu content 0.6 ≤ x ≤ 0.85, favors the idea that a smooth change of band structure is the main factor governing the reentrant MIT in Ca_{1-x}Eu_{x}B_{6}.

Keywords

EN

71.30.+h; 72.15.Gd; 75.47.Gk

Discipline

• 71.30.+h: Metal-insulator transitions and other electronic transitions
• 75.47.Gk: Colossal magnetoresistance
• 72.15.Gd: Galvanomagnetic and other magnetotransport effects(see also 75.47.-m Magnetotransport phenomena; materials for magnetotransport)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 294-295

Dates

published

2014-07

Contributors

author

V. Glushkov

• Prokhorov General Physics Institute of RAS, Vavilov str. 38, Moscow 119991 Russia
• Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudny, Moscow Region 141700 Russia

author

M. Anisimov

• Prokhorov General Physics Institute of RAS, Vavilov str. 38, Moscow 119991 Russia

author

R. Baybakov

• National Research Nuclear University "MEPhI", Kashirskoe Shosse 31, Moscow 115409 Russia

author

S. Demishev

• Prokhorov General Physics Institute of RAS, Vavilov str. 38, Moscow 119991 Russia
• Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudny, Moscow Region 141700 Russia

author

V. Filippov

• Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, Kiev 03680 Ukraine

author

K. Flachbart

• Institute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia

author

A. Kuznetsov

• National Research Nuclear University "MEPhI", Kashirskoe Shosse 31, Moscow 115409 Russia

author

N. Shitsevalova

• Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, Kiev 03680 Ukraine

author

N. Sluchanko

• Prokhorov General Physics Institute of RAS, Vavilov str. 38, Moscow 119991 Russia

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Identifiers

DOI

10.12693/APhysPolA.126.294