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Dislocation-Mediated Lattice Distortion and Griffiths Phase Behavior in Melt-Spun Ni2MnSb Ribbons.

Kun Wang1, Siying Yu1, Qizhong Zhao1

  • 1School of Physics, MOE Key Laboratory For Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 22, 2026
PubMed
Summary
This summary is machine-generated.

Local lattice distortions in Ni2MnSb ribbons, induced by melt-quenching, create a Griffiths phase. Increasing dislocation density broadens this phase, offering control over magnetic properties in Heusler alloys.

Keywords:
dislocationgriffiths phaseheusler alloylocal lattice distortionmagnetic phase transitions

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Magnetism

Background:

  • The Griffiths phase is a precursor to ferromagnetic ordering in disordered magnetic systems.
  • Local lattice distortion in Heusler alloys is a critical factor in Griffiths phase formation.

Purpose of the Study:

  • Investigate the causes of local lattice distortion in Ni2MnSb ribbons.
  • Analyze the role of lattice distortions in Griffiths phase formation.
  • Establish a correlation between structural defects and magnetic properties.

Main Methods:

  • Melt-quenching technique to prepare Ni2MnSb ribbon samples.
  • Structural analysis to determine dislocation density and lattice distortions.
  • Magnetic measurements to characterize the Griffiths phase temperature range.

Main Results:

  • Increasing wheel speed during melt-quenching elevated dislocation density and local lattice distortions.
  • A systematic broadening of the Griffiths phase temperature range was observed with increasing distortions.
  • Dislocation-induced lattice distortions were found to generate inhomogeneous exchange interactions, stabilizing ferromagnetic clusters.

Conclusions:

  • Dislocation-induced lattice distortions are key to the formation of the Griffiths phase in Ni2MnSb.
  • Controllable tuning of the Griffiths phase is achievable by manipulating dislocation density.
  • This study provides fundamental insights into the intrinsic mechanism of Griffiths phase formation in Heusler systems.