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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Ferromagnetic Quantum Critical Point in Noncentrosymmetric Systems.

T R Kirkpatrick1, D Belitz2,3

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|April 28, 2020
PubMed
Summary
This summary is machine-generated.

Researchers found that noncentrosymmetric metals with strong spin-orbit interactions may enable ferromagnetic quantum criticality in clean systems. This is because spin-orbit interaction masses the soft modes that typically prevent such critical points from forming.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Ferromagnetic quantum criticality in clean metals is difficult to achieve.
  • Fermionic soft modes typically drive ferromagnetic transitions first-order, hindering quantum criticality.
  • Previous research has not identified suitable clean material systems for ferromagnetic quantum critical points.

Purpose of the Study:

  • To identify a promising class of materials for realizing ferromagnetic quantum criticality in clean systems.
  • To investigate the role of spin-orbit interaction and broken inversion symmetry in achieving quantum criticality.

Main Methods:

  • Theoretical analysis of electronic properties in noncentrosymmetric metals.
  • Investigating the impact of strong spin-orbit interaction on fermionic soft modes.
  • Examining the effect of the absence of spatial inversion symmetry on emergent soft modes.

Main Results:

  • Noncentrosymmetric metals with strong spin-orbit interaction are identified as promising candidates.
  • The spin-orbit interaction effectively 'masses' the soft modes that typically disrupt quantum criticality.
  • The absence of spatial inversion symmetry prevents the emergence of new disruptive soft modes.

Conclusions:

  • Noncentrosymmetric metals with strong spin-orbit interaction offer a viable route to clean ferromagnetic quantum critical points.
  • This finding opens new avenues for exploring exotic quantum phenomena in condensed matter systems.