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Related Experiment Videos

CaB6: a new semiconducting material for spin electronics.

H J Tromp1, P van Gelderen, P J Kelly

  • 1Faculty of Applied Physics and MESA+ Research Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

Physical Review Letters
|July 20, 2001
PubMed
Summary
This summary is machine-generated.

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High-temperature ferromagnetism in lanthanum-doped calcium hexaboride (La(x)Ca1-xB6) is explained by a semiconductor model. This contradicts previous semimetallic theories, revealing magnetism near a Mott transition in the impurity band.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Ferromagnetism observed at high temperatures in lanthanum-doped calcium hexaboride (La(x)Ca1-xB6) presents a puzzle.
  • Existing theoretical models rely on a semimetallic electronic structure for calcium hexaboride (CaB6).

Purpose of the Study:

  • To investigate the electronic structure of CaB6 using advanced theoretical methods.
  • To clarify the fundamental electronic properties of CaB6 and their relation to magnetism in La-doped samples.

Main Methods:

  • Parameter-free quasiparticle calculations were employed.
  • The single-particle excitation spectrum of CaB6 was computed.

Main Results:

  • CaB6 is determined to be a semiconductor, not a semimetal.

Related Experiment Videos

  • A band gap of 0.8 ± 0.1 eV was calculated for CaB6.
  • Magnetism in La(x)Ca1-xB6 arises on the metallic side of a Mott transition within the lanthanum-induced impurity band.

    • Conclusions:

    • The electronic structure of CaB6 is fundamentally semiconducting.
    • This finding necessitates a revision of theoretical explanations for ferromagnetism in La(x)Ca1-xB6.
    • The observed magnetism is linked to the behavior of the impurity band near a Mott transition.