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Dimerization-induced Fermi-surface reconstruction in IrTe2.

Man Jin Eom1, Kyoo Kim1, Y J Jo2

  • 1Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.

Physical Review Letters
|January 24, 2015
PubMed
Summary
This summary is machine-generated.

We studied Iridium Ditelluride (IrTe2) single crystals using de Haas-van Alphen (dHvA) oscillations. Our findings reveal complex dimer formations and Fermi surface reconstructions due to specific dimerizations.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Physics

Background:

  • Iridium Ditelluride (IrTe2) exhibits complex structural properties.
  • Understanding electronic behavior in IrTe2 is crucial for novel material applications.

Purpose of the Study:

  • To investigate the electronic properties of IrTe2 single crystals.
  • To elucidate the impact of dimer formations on the Fermi surface.
  • To identify the driving forces behind complex dimer formations in IrTe2.

Main Methods:

  • De Haas-van Alphen (dHvA) oscillation measurements on IrTe2 single crystals.
  • Angle-dependent dHvA oscillation analysis.
  • Comparison with theoretical band structure calculations.

Main Results:

  • Observed distinct Fermi surface reconstructions induced by 1/5-type and 1/8-type dimerizations.
  • Confirmed the induction of quasi-two-dimensional conducting planes by dimerization.
  • Identified a phase transition to the 1/8 phase with higher dimer density.

Conclusions:

  • Dimerization in IrTe2 leads to significant Fermi surface reconstruction and quasi-two-dimensional electronic behavior.
  • Local instabilities in intra- and interdimer couplings drive complex dimer formations.
  • The study provides insights into the electronic phase transitions in IrTe2.