| Full text | |
| Author(s): Show less - |
Gastaldo, Vinicius Pascotto
[1, 2, 3, 4]
;
Rao, Mala N.
[5, 6]
;
Bosak, Alexey
[7]
;
d'Astuto, Matteo
[3, 4, 8]
;
Prodi, Andrea
[7]
;
Verseils, Marine
[3, 4, 9]
;
Klein, Yannick
[3, 4]
;
Bellin, Christophe
[3, 4]
;
Paolasini, Luigi
[7]
;
de Oliveira, Adilson J. A.
[1]
;
Gilioli, Edmondo
[10]
;
Chaplot, Samrath Lal
[5, 6]
;
Gauzzi, Andrea
[3, 4]
Total Authors: 13
|
| Affiliation: | [1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Fed Mato Grosso do Sul, Inst Fis, BR-79070900 Campo Grande, MS - Brazil
[3] Sorbonne Univ, IMPMC, CNRS, 4 Pl Jussieu, F-75005 Paris - France
[4] MNHN, 4 Pl Jussieu, F-75005 Paris - France
[5] Homi Bhabha Natl Inst, Mumbai 400094, Maharashtra - India
[6] Bhabha Atom Res Ctr, Solid State Phys Div, Mumbai 400085, Maharashtra - India
[7] ESRF The European Synchrotron, 71 Ave Martyrs, CS 40220, F-38043 Grenoble 9 - France
[8] Univ Grenoble Alpes, Inst Neel, Grenoble INP, CNRS, F-38000 Grenoble - France
[9] Synchrotron SOLEIL, Ligne AILES, F-91190 Gif Sur Yvette - France
[10] Ist Mat Elettron & Magnetismo, CNR, I-43124 Parma - Italy
Total Affiliations: 10
|
| Document type: | Journal article |
| Source: | Physical Review B; v. 104, n. 23 DEC 7 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
By means of diffuse x-ray scattering (DS) and inelastic x-ray scattering (IXS), we probe directly the chargeordering (CO) dynamics in the Verwey system (NaMn3)Mn4O12, where a peculiar quadruple perovskite structure with no oxygen disorder stabilizes a nearly full Mn3+/Mn4+ static charge order at TCO = 175 K concomitant to a commensurate structural modulation with propagation vector qCO = (21, 12, 0). At TCO, the IXS spectra unveil a softening of a 35.3-meV phonon at qCO. Lattice dynamical calculations enable us to attribute this soft phonon to an Ag mode whose polarization matches the Jahn-Teller-like distortion pattern of the structural modulation. This result demonstrates that the Jahn-Teller instability is the driving force of the CO Verwey transition in (NaMn3)Mn4O12, thus elucidating a long-standing controversy regarding the mechanism of this transition observed in other mixed-valence systems like magnetite. (AU) | |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 15/21206-1 - Growth of thin films of quadruple multiferroic perovskite and investigation of the electron-phonon coupling using thermal and optics measurements. |
| Grantee: | Vinicius Pascotto Gastaldo |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate (Direct) |
| FAPESP's process: | 13/27097-4 - Magnetic and electrical properties of multiferroic systems: single-phase and composites |
| Grantee: | Vinicius Pascotto Gastaldo |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |