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Related Experiment Video

Updated: Nov 5, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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A continuous metal-insulator transition driven by spin correlations.

Yejun Feng1,2, Yishu Wang3,4, D M Silevitch3

  • 1Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa, 904-0495, Japan. yejun@oist.jp.

Nature Communications
|May 14, 2021
PubMed
Summary
This summary is machine-generated.

This study reveals a rare spin-correlation-driven metal-insulator transition in Cd2Os2O7, distinct from Mott insulators. A charge gap opens at low temperatures, preserving lattice symmetry in this pyrochlore antiferromagnet.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Mott insulators, driven by Coulomb interactions, are common metal-insulator transitions.
  • Insulators driven purely by spin correlations are rare due to competing energy scales.

Purpose of the Study:

  • To demonstrate a clean example of a spin-correlation-driven metal-insulator transition.
  • To investigate the mechanism in the pyrochlore antiferromagnet Cd2Os2O7.

Main Methods:

  • Experimental removal of antisymmetric linear magnetoresistance.
  • Analysis of bulk Hall coefficient to identify Fermi surfaces.
  • Temperature-dependent measurements below the Néel temperature (TN).

Main Results:

  • Cd2Os2O7 exhibits a spin-correlation-driven metal-insulator transition with preserved lattice symmetry.
  • Four Fermi surfaces (electron and hole types) depart the Fermi level as temperature decreases below TN = 227 K.
  • A charge gap opens at ~10 K, significantly below TN, distinguishing it from Mott insulators and spin density waves.

Conclusions:

  • Cd2Os2O7 provides a rare, clean example of a spin-correlation-driven metal-insulator transition.
  • The observed insulating mechanism aligns with the Slater picture but without a folded Brillouin zone.
  • The transition's low-temperature gap opening contrasts with the behavior of Mott insulators and spin density waves.