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Number of results
2014 | 126 | 2 | 572-576

Article title

Curie Temperature and Density of States at the Fermi Level for Al-Cu-Fe Phases: β-Solid State Solution-Approximants-Icosahedral Quasicrystals

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EN

Abstracts

EN
A consistent reduction in the absolute value of the negative paramagnetic Curie temperature was found in a series of Al-Cu-Fe phases: β(CsCl)-solid state solution, noncanonical approximant (η-AlCu(Fe) phase), rational approximants (P1+P2-pentagonal phases) and icosahedral quasicrystal. For these Al-Cu-Fe phases, the decrease in the Curie temperature correlates with a reduction of the density of states at the Fermi level which was estimated from the low-temperature heat capacity measurements and first-principles calculations. The observed correlation was related to the antiferromagnetic indirect exchange interaction (Ruderman-Kittel-Kasuya-Yosida interaction) between the localized magnetic moments on Fe induced by the intrinsic structural defects in the Al-Cu-Fe phases. The weakening of Fe 3d-Al s, p hybridization owing to the intrinsic structural defects such as vacancies, antisite defects and distortions of coordination polyhedrons is suggested to be the main mechanism of appearance of localized magnetic moments on Fe atoms.

Keywords

Contributors

author
  • Institute of Solid State Chemistry, Ural Branch RAS, Ekaterinburg, Russia
  • Ural Federal University, Ekaterinburg, Russia
author
  • Institute of Metal Physics, Ural Branch RAS, Ekaterinburg, Russia
  • Institute of Metal Physics, Ural Branch RAS, Ekaterinburg, Russia
author
  • Institute of Solid State Chemistry, Ural Branch RAS, Ekaterinburg, Russia

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Document Type

Publication order reference

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YADDA identifier

bwmeta1.element.bwnjournal-article-appv126n237kz
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