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2014 | 126 | 1 | 294-295
Article title

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

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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
Contributors
author
  • 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
  • Prokhorov General Physics Institute of RAS, Vavilov str. 38, Moscow 119991 Russia
author
  • National Research Nuclear University "MEPhI", Kashirskoe Shosse 31, Moscow 115409 Russia
author
  • 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
  • Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, Kiev 03680 Ukraine
author
  • Institute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia
author
  • National Research Nuclear University "MEPhI", Kashirskoe Shosse 31, Moscow 115409 Russia
  • Frantsevich Institute for Problems of Materials Science NAS, Krzhyzhanovsky str. 3, Kiev 03680 Ukraine
author
  • Prokhorov General Physics Institute of RAS, Vavilov str. 38, Moscow 119991 Russia
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv126n1142kz
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