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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Anisotropic magnetic excitations and incipient Neel order in Ba(Fe1-xMnx)(2)As-2

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Author(s):
Garcia, Fernando A. [1] ; Ivashko, Oleh [2] ; McNally, Daniel E. [3] ; Das, Lakshmi [2] ; Piva, Mario M. [4] ; Adriano, C. [4] ; Pagliuso, Pascoal G. [4] ; Chang, Johan [2] ; Schmitt, Thorsten [1] ; Monney, Claude [5]
Total Authors: 10
Affiliation:
[1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, SP - Brazil
[2] Univ Zuerich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich - Switzerland
[3] Paul Scherrer Inst, Photon Sci Div, Swiss Light Source, CH-5232 Villigen - Switzerland
[4] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[5] Univ Fribourg, Phys Dept, Ch Musee 3, CH-1700 Fribourg - Switzerland
Total Affiliations: 5
Document type: Journal article
Source: Physical Review B; v. 99, n. 11 MAR 14 2019.
Web of Science Citations: 1
Abstract

It is currently understood that high temperature superconductivity (SC) in the transition metal (M) substituted iron arsenides Ba(Fe1-xMx)(2)As-2 is promoted by magnetic excitations with wave vectors (pi, 0) or (0, pi). It is known that while a small amount of Co substitution lead to SC, the same does not occur for Mn for any value of x. In this work, magnetic excitations in the iron arsenides Ba(Fe1-xMnx)(2)As-2 (x = 0.0, 0.007, 0.009, 0.08) are investigated by means of resonant inelastic x-ray scattering (RIXS) at the Fe L-3 edge, for momentum transfer q along the high symmetry Brillouin zone (pi, 0) and (pi, pi) directions. It is shown that with increasing Mn content (x), the excitations become anisotropic both in dispersion and lineshape. Both effects are detected even for small values of x, evidencing a cooperative phenomenon between the Mn impurities, that we ascribe to emerging Neel order of the Mn spins. Moreover, for x = 0.08, the excitations along q parallel to (pi, 0) are strongly damped and nearly nondispersive. This result suggests that phases of arsenides containing local moments at the FeAs layers, as in Mn or Cr substituted phases, do not support high temperature SC due to the absence of the appropriate magnetic excitations. (AU)

FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
Grantee:Pascoal Jose Giglio Pagliuso
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/15665-3 - Studies of orbital differentiation effects in the magnetic and superconducting properties of FeAs based compounds
Grantee:Mário Moda Piva
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 17/25269-3 - High pressure studies in SrFe2As2, CaMn2Bi2 and CeAuBi2 compounds
Grantee:Mário Moda Piva
Support type: Scholarships abroad - Research Internship - Doctorate (Direct)