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N'Diaye A, Bordage A, Nataf L, Baudelet F, Rivière E, Bleuzen A. Interplay between transition-metal K-edge XMCD, slight structural distortions and magnetism in a series of trimetallic (Co xNi (1-x)) 4[Fe(CN) 6] 3/8 Prussian blue analogues. Phys Chem Chem Phys 2024; 26:15576-15586. [PMID: 38757724 DOI: 10.1039/d3cp04749k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
The magnetic properties of a series of trimetallic (Co,Ni)Fe Prussian blue analogues (PBAs) were investigated by SQUID magnetometry and X-ray magnetic circular dichroism (XMCD) at the three transition metal (TM) K-edges. In turn, the PBA trimetallic series was used as a tool in order to better understand the information contained in TM K-edge XMCD and particularly the chemical nature of the probed species (extended sub-lattice or localized entities). The results show that the magnetic behavior of the compounds is dictated by competing exchange interactions between the Co-Fe and Ni-Fe pairs, without spin frustration. They also show that XMCD at the TM K-edge is a local atomic probe of the element at the N side of the cyanide bridge and a local probe of the absorbing atom and its first magnetic neighbors on the C side of the bridge. At last, XMCD at the TM K-edge turns out to be highly sensitive to very small structural distortions.
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Affiliation(s)
- Adama N'Diaye
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay, France.
| | - Amélie Bordage
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay, France.
| | - Lucie Nataf
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin, BP 48, 91192 Gif sur Yvette, France
| | - François Baudelet
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay, France.
| | - Anne Bleuzen
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay, France.
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N’Diaye A, Bordage A, Nataf L, Baudelet F, Rivière E, Bleuzen A. Interplay between Transition-Metal K-edge XMCD and Magnetism in Prussian Blue Analogs. ACS OMEGA 2022; 7:36366-36378. [PMID: 36278067 PMCID: PMC9583310 DOI: 10.1021/acsomega.2c04049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 07/25/2022] [Indexed: 06/16/2023]
Abstract
To disentangle the information contained in transition-metal K-edge X-ray magnetic circular dichroism (XMCD), two series of Prussian blue analogs (PBAs) were investigated as model compounds. The number of 3d electrons and the magnetic orbitals have been varied on both sites of the bimetallic cyanide polymer by combining with the hexacyanoferrate or the hexacyanochromate entities' various divalent metal ions A2+ (Mn2+, Fe2+, Co2+, Ni2+, and Cu2+). These PBA were studied by Fe and Cr X-ray absorption spectroscopy and XMCD. The results, compared to those obtained at the A K-edges in a previous work, show that transition-metal K-edge XMCD is very sensitive to orbital symmetry and can therefore give valuable information on the local structure of the magnetic centers. Expressions of the intensity of the main 1s → 4p contribution to the signal are proposed for all K-edges and all compounds. The results pave the way toward a new tool for molecular materials able to give access to valuable information on the local orientation of the magnetic moments or to better understand the role of 4p orbitals involved in their magnetic properties.
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Affiliation(s)
- Adama N’Diaye
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
CNRS, Université Paris-Saclay, 91405Orsay, France
| | - Amélie Bordage
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
CNRS, Université Paris-Saclay, 91405Orsay, France
| | - Lucie Nataf
- Synchrotron
SOLEIL, L’Orme des Merisiers, St Aubin, BP 48, F-91192Gif sur Yvette, France
| | - François Baudelet
- Synchrotron
SOLEIL, L’Orme des Merisiers, St Aubin, BP 48, F-91192Gif sur Yvette, France
| | - Eric Rivière
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
CNRS, Université Paris-Saclay, 91405Orsay, France
| | - Anne Bleuzen
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
CNRS, Université Paris-Saclay, 91405Orsay, France
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N'Diaye A, Bordage A, Nataf L, Baudelet F, Rivière E, Bleuzen A. Toward Quantitative Magnetic Information from Transition Metal K-Edge XMCD of Prussian Blue Analogs. Inorg Chem 2022; 61:6326-6336. [PMID: 35414167 DOI: 10.1021/acs.inorgchem.2c00637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two series of Prussian blue analogs (PBA) were used as model compounds in order to disentangle the information contained in X-ray magnetic circular dichroism (XMCD) at the K-edges of transition metals. The number of 3d electrons on one site of the bimetallic cyanide polymer has been varied by associating to the [Fe(CN)6]3- or the [Cr(CN)6]3- precursors various divalent metal ions A2+ (Mn2+, Fe2+, Co2+, Ni2+, and Cu2+). The compounds were studied by X-ray diffraction and SQUID magnetometry, as well as by X-ray absorption spectroscopy and XMCD at the K-edges of the A2+ transition metal ion. The study shows that the 1s → 4p contribution to the A K-edge XMCD signal can be related to the electronic structure and the magnetic behavior of the probed A2+ ion: the shape of the signal to the filling of the 3d orbitals, the sign of the signal to the direction of the magnetic moment with respect to the applied magnetic field, the intensity of the signal to the total spin number SA, and the area under curve to the Curie constant CA. The whole study hence demonstrates that PBAs are particularly well-adapted for understanding the information contained in the transition metals K-edge XMCD signals. It also offers new perspectives toward the full disentangling of the information contained in these signals and access to new insights into materials magnetic properties.
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Affiliation(s)
- Adama N'Diaye
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - Amélie Bordage
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - Lucie Nataf
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, BP 48, F-91192 Gif sur Yvette, France
| | - François Baudelet
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, BP 48, F-91192 Gif sur Yvette, France
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - Anne Bleuzen
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS, Université Paris-Saclay, 91405 Orsay, France
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Chaboy J, Lázpita P, Barandiarán JM, Gutiérrez J, Fernández-Gubieda ML, Kawamura N. XAS and XMCD study of the influence of annealing on the atomic ordering and magnetism in an NiMnGa alloy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:016002. [PMID: 21817239 DOI: 10.1088/0953-8984/21/1/016002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The proper annealing of Ni(51)Mn(28)Ga(21) ribbon alloy gives rise to an increase of the saturation magnetization and of the magnetic order T(C) (up to 20 K) and martensitic transition T(M) (up to 10 K) temperatures. The combined x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) studies indicate that the annealing treatment drives the alloy to a more ordered structure without significantly affecting the local structure in terms of interatomic distances and bonding geometry. By contrast, the annealing strongly affects the near-edge absorption at the Mn K-edge while no effect is observed at either the Ni or Ga K-edge. These results suggest that annealing leads to a modification of the electronic structure of the Mn atoms while that of Ni and Ga atoms remains unvaried. However, strong XMCD signals are detected at both Ni and Ga K-edges whose amplitude increases after annealing. These results point out that despite the change of the magnetic properties of the system being mainly associated with the modification of the electronic properties of the Mn atoms, both Ni and Ga may play a non-negligible role through the polarization of the conduction band.
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Affiliation(s)
- J Chaboy
- Instituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
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Duman E, Acet M, Wassermann EF, Itié JP, Baudelet F, Mathon O, Pascarelli S. Magnetic instabilities in Fe3C cementite particles observed with Fe K-edge x-ray circular dichroism under pressure. PHYSICAL REVIEW LETTERS 2005; 94:075502. [PMID: 15783825 DOI: 10.1103/physrevlett.94.075502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2004] [Indexed: 05/24/2023]
Abstract
The ferromagnetic interstitial iron compound Fe(3)C (cementite) is expected to have Invar properties, whereby a high-moment to low-moment transition should occur when the atomic volume is reduced below a critical value. We, therefore, examine the pressure dependence of the Fe K-edge x-ray magnetic circular dichroism in Fe(3)C at ambient temperature and pressures up to 20 GPa. We find clear evidence for a high-moment to low-moment transition around 10 GPa.
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Affiliation(s)
- E Duman
- Experimentalphysik, Universität Duisburg-Essen, D-47048 Duisburg, Germany
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Brouder C, Alouani M, Bennemann KH. Multiple-scattering theory of x-ray magnetic circular dichroism: Implementation and results for the iron K edge. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:7334-7349. [PMID: 9984356 DOI: 10.1103/physrevb.54.7334] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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