Incommensurate Magnetism in FeAs Strips: Neutron Scattering from CaFe4As3

Abstract

Magnetism in the orthorhombic metal CaFe4As3 was examined through neutron diffraction for powder and single crystalline samples. Incommensurate (qm approx. equal to (0.37-0.39) x b*) and predominantly longitudinally (|| b) modulated order develops through a 2nd order phase transition at TN = 89.63(6) K with a 3D Heisenberg-like critical exponent Beta = 0.365(6). A 1st order transition at T2 = 25.6(9) K is associated with the development of a transverse component, locking qm to 0.375(2)b*, and increasing the moments from 2.1(1) to 2.2(3) micro-B for Fe2+ and from 1.3(3) to 2.4(4) micro-B for Fe+. The ab-initio Fermi surface is consistent with a nesting instability in cross-linked FeAs strips.

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Document Details

Document Type
Technical Report
Publication Date
Dec 21, 2010
Accession Number
ADA534714

Entities

People

  • Collin Broholm
  • Emilia Morosan
  • Gabriel Kotliar
  • Jose A. Rodriguez-rivera
  • Kyoo Kim
  • Liang L. Zhao
  • Mark A. Green
  • Pawel Zajdel
  • William Ratcliff
  • Yusuke Nambu

Organizations

  • Johns Hopkins University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Band Structures
  • Crystal Structure
  • Crystals
  • Diffraction
  • Fermi Surfaces
  • Magnetic Properties
  • Materials
  • Materials Science
  • Neutron Diffraction
  • Neutron Scattering
  • New York
  • Phase
  • Phase Transformations
  • Physics
  • Scattering
  • Single Crystals
  • Solid State Physics

Fields of Study

  • Physics

Readers

  • Nanofabrication and Microfabrication.
  • Quantum Chemistry
  • Superconducting Magnet Technology