| Full text | |
| Author(s): |
Garcia, Fernando A.
;
Ivashko, Oleh
;
McNally, Daniel E.
;
Das, Lakshmi
;
Piva, Mario M.
;
Adriano, C.
;
Pagliuso, Pascoal G.
;
Chang, Johan
;
Schmitt, Thorsten
;
Monney, Claude
Total Authors: 10
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 99, n. 11, p. 7-pg., 2019-03-14. |
| 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: | 15/15665-3 - Studies of orbital differentiation effects in the magnetic and superconducting properties of FeAs based compounds |
| Grantee: | Mário Moda Piva |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 17/10581-1 - Emergent phenomena in reduced dimension systems |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Special Projects |
| FAPESP's process: | 17/25269-3 - High pressure studies in SrFe2As2, CaMn2Bi2 and CeAuBi2 compounds |
| Grantee: | Mário Moda Piva |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate (Direct) |