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Possible realization of an antiferromagnetic Griffiths phase in Ba[Fe(1-x)Mn(x)](2)As(2) | | D. S. Inosov
; G. Friemel
; J. T. Park
; A. C. Walters
; Y. Texier
; Y. Laplace
; J. Bobroff
; V. Hinkov
; D. L. Sun
; Y. Liu
; R. Khasanov
; K. Sedlak
; Ph. Bourges
; Y. Sidis
; A. Ivanov
; C. T. Lin
; T. Keller
; B. Keimer
; | | Date: |
17 May 2013 | | Abstract: | We investigate magnetic ordering in metallic Ba[Fe(1-x)Mn(x)](2)As(2) and
discuss the unusual magnetic phase, which was recently discovered for Mn
concentrations x > 10%. We argue that it can be understood as a Griffiths-type
phase that forms above the quantum critical point associated with the
suppression of the stripe-antiferromagnetic spin-density-wave (SDW) order in
BaFe2As2 by the randomly introduced localized Mn moments acting as strong
magnetic impurities. While the SDW transition at x = 0, 2.5% and 5% remains
equally sharp, in the x = 12% sample we observe an abrupt smearing of the
antiferromagnetic transition in temperature and a considerable suppression of
the spin gap in the magnetic excitation spectrum. According to our
muon-spin-relaxation, nuclear magnetic resonance and neutron-scattering data,
antiferromagnetically ordered rare regions start forming in the x = 12% sample
significantly above the N’eel temperature of the parent compound. Upon
cooling, their volume grows continuously, leading to an increase in the
magnetic Bragg intensity and to the gradual opening of a partial spin gap in
the magnetic excitation spectrum. Using neutron Larmor diffraction, we also
demonstrate that the magnetically ordered volume is characterized by a finite
orthorhombic distortion, which could not be resolved in previous diffraction
studies most probably due to its coexistence with the tetragonal phase and a
microstrain-induced broadening of the Bragg reflections. We argue that
Ba[Fe(1-x)Mn(x)](2)As(2) could represent an interesting model spin-glass
system, in which localized magnetic moments are randomly embedded into a SDW
metal with Fermi surface nesting. | | Source: | arXiv, 1305.4164 | | Services: | Forum | Review | PDF | Favorites | |
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