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Local inhomogeneous state in multiferroic SmCrO3.

G N P Oliveira1, R C Teixeira2, R P Moreira2

  • 1IFIMUP-Instituto de Física de Materiais Avançados, Nanotecnologia e Fotónica, Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007, Porto, Portugal. goliveira@fc.up.pt.

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|March 15, 2020
PubMed
Summary
This summary is machine-generated.

Researchers investigated rare-earth orthochromites, specifically samarium chromium oxide (SmCrO3), to understand their ferroelectric order. They discovered an emerging local distortion near room temperature, indicating a complex, inhomogeneous polar state rather than a simple structural phase transition.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Crystallography

Background:

  • Rare-earth orthochromites (RCrO3) with distorted perovskite structures exhibit debated ferroelectric order origins.
  • The question of whether these materials are magnetically driven improper ferroelectrics, similar to rare-earth manganites and orthoferrites, remains a key research area.

Purpose of the Study:

  • To investigate the atomic-scale behavior of samarium chromium oxide (SmCrO3) to elucidate the origin of its ferroelectric order.
  • To determine if the ferroelectric phase in SmCrO3 arises from a simple structural transition or a more complex phenomenon.

Main Methods:

  • Atomic-scale study of the samarium chromium oxide (SmCrO3) system.
  • Electric Field Gradient (EFG) measurements.
  • First-principles calculations.

Main Results:

  • A distortion of the samarium (Sm) local environment emerges near room temperature within the paramagnetic phase.
  • The observed emergent phase in SmCrO3 is not consistent with the previously reported Pna21 structure.
  • A local inhomogeneous state, characterized by the coexistence of regular non-polar and polar distorted environments, develops at low temperatures.

Conclusions:

  • The ferroelectric order in SmCrO3 does not stem from a simple structural phase transition to a Pna21 structure.
  • A complex, low-temperature inhomogeneous state with coexisting polar and non-polar environments is responsible for the observed phenomena.
  • This finding challenges existing models for ferroelectricity in rare-earth orthochromites.