| Full text | |
| Author(s): |
Mardegan, J. R. L.
;
Francoual, S.
;
Fabbris, G.
;
Veiga, L. S. I.
;
Strempfer, J.
;
Haskel, D.
;
Ribeiro, R. A.
;
Avila, M. A.
;
Giles, C.
Total Authors: 9
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 93, n. 2, p. 8-pg., 2016-01-26. |
| Abstract | |
We investigate the magnetic and electronic properties of the GdT2Zn20 (T = Fe and Co) compounds using x-ray resonant magnetic scattering (XRMS), x-ray absorption near-edge structure (XANES), and x-ray magnetic circular dichroism (XMCD). The XRMS measurements reveal that GdCo2Zn20 has a commensurate antiferromagnetic spin structure with a magnetic propagation vector (tau) over right arrow = (1/2, 1/2, 1/2) below the Neel temperature (T-N similar to 5.7 K). Only the Gd ions carry a magnetic moment forming an antiferromagnetic structure with magnetic representation Gamma(6). For the ferromagnetic GdFe2Zn20 compound, an extensive investigation was performed at low temperature and under magnetic field using XANES and XMCD. A strong XMCD signal of about 12.5% and 9.7% is observed below the Curie temperature (T-C similar to 85K) at the Gd L-2 and L-3 edges, respectively. In addition, a small magnetic signal of about 0.06% of the jump is recorded at the Zn K edge, suggesting that the Zn 4p states are spin polarized by the Gd 5d extended orbitals. (AU) | |
| FAPESP's process: | 12/17562-9 - Preparation of oriented single crystals for studies on electronic, magnetic and thermal anisotropies |
| Grantee: | Marcos de Abreu Avila |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 11/24166-0 - Study of intermetallic compounds using synchrotron radiation spectroscopy |
| Grantee: | José Renato Linares Mardegan |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 09/10264-0 - Study of intermetalic compounds for thermoelectrical applications by x-ray diffraction |
| Grantee: | José Renato Linares Mardegan |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 12/10675-2 - Probing the magnetization dynamics of antiferromagnetic NiO by time resolved X-ray magnetic scattering |
| Grantee: | Carlos Manuel Giles Antunez de Mayolo |
| Support Opportunities: | Scholarships abroad - Research |
| FAPESP's process: | 11/19924-2 - Study and development of advanced novel materials: electronic, magnetic and nanostructured: an interdisciplinary approach |
| Grantee: | Carlos Rettori |
| Support Opportunities: | Research Projects - Thematic Grants |