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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Crystal Field Theory
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Two Spin-State Crystallizations in LaCoO_{3}.

Akihiko Ikeda1, Yasuhiro H Matsuda1, Keisuke Sato2

  • 1Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

Physical Review Letters
|November 6, 2020
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Summary
This summary is machine-generated.

This study reveals that high magnetic fields induce crystallizations, not condensations, in lanthanum cobalt oxide (LaCoO_{3}). These distinct crystallizations demonstrate the interplay between electron correlation and spin crossover, impacting lattice structure.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Magnetism

Background:

  • Lanthanum cobalt oxide (LaCoO_{3}) exhibits complex spin crossover behavior under high magnetic fields.
  • A scientific debate exists regarding the nature of novel phases in LaCoO_{3}: crystallizations versus Bose-Einstein condensation.

Purpose of the Study:

  • To investigate the interplay between electron correlation and spin crossover in LaCoO_{3} at ultra-high magnetic fields (>100 T).
  • To resolve the controversy surrounding the origin of novel phases in LaCoO_{3} under magnetic fields.

Main Methods:

  • Magnetostriction measurements using a state-of-the-art strain gauge.
  • Application of magnetic fields exceeding 100 Tesla.

Main Results:

  • Observed distinct magnetostriction plateaux, indicating two different crystallization phases.
  • Demonstrated that these phases are crystallizations, not Bose-Einstein condensations.
  • Showcased cooperative lattice changes associated with spin state localization and interactions.

Conclusions:

  • The novel phases in LaCoO_{3} under high magnetic fields are confirmed as distinct crystallizations.
  • This study clarifies the nature of spin crossover phenomena in LaCoO_{3}, highlighting lattice-driven changes.