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Publication Detail
Helical spin waves, magnetic order, and fluctuations in the langasite compound Ba3NbFe3Si2O14
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Stock C, Chapon LC, Schneidewind A, Su Y, Radaelli PG, McMorrow DF, Bombardi A, Lee N, Cheong SW
  • Publisher:
    AMER PHYSICAL SOC
  • Publication date:
    30/03/2011
  • Journal:
    PHYS REV B
  • Volume:
    83
  • Issue:
    10
  • Print ISSN:
    1098-0121
  • Language:
    EN
  • Keywords:
    TRIANGULAR ANTIFERROMAGNETS, NEUTRON-SCATTERING, PHASE, POLARIZATION, BA2CUGE2O7, BEHAVIOR, CSMNBR3
  • Addresses:
    Stock, C
    NIST
    Ctr Neutron Res
    Gaithersburg
    MD
    20899
    USA

    Indiana Univ
    Cyclotron Facil
    Bloomington
    IN
    47404
    USA
Abstract
We have investigated spin fluctuations in the langasite compound Ba3NbFe3Si2O14 both in the ordered state and as a function of temperature. The low-temperature magnetic structure is defined by a spiral phase characterized by magnetic Bragg peaks at (q) over right arrow = (0,0,tau similar to 1/7) onset at T-N = 27 K as previously reported by Marty et al. [Phys. Rev. Lett. 101, 247201 (2008)]. The nature of the fluctuations and temperature dependence of the order parameter is consistent with a classical second-order phase transition for a two-dimensional triangular antiferromagnet. We show that the physical properties and energy scales including the ordering wave vector, Curie-Weiss temperature, and spin waves can be explained through the use of only symmetric exchange constants without the need for a dominant Dzyaloshinskii-Moriya interaction. This is accomplished through a set of "helical" exchange pathways along the c direction imposed by the chiral crystal structure and naturally explains the magnetic diffuse scattering, which displays a strong vector chirality up to high temperatures, well above the ordering temperature. This illustrates a strong coupling between magnetic and crystalline chirality in this compound.
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