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Colin C, Barbier M, Ouisse T, Ressouche E, Tao Q, Rosen J, Ballou R, Opagiste C, Petříček V. Variety and complexity of magnetic structures of rare earth-based nano-lamellar i-MAX phases. Acta Cryst Sect A 2022. [DOI: 10.1107/s205327332209547x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
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2
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Facheris L, Povarov KY, Nabi SD, Mazzone DG, Lass J, Roessli B, Ressouche E, Yan Z, Gvasaliya S, Zheludev A. Spin Density Wave versus Fractional Magnetization Plateau in a Triangular Antiferromagnet. Phys Rev Lett 2022; 129:087201. [PMID: 36053701 DOI: 10.1103/physrevlett.129.087201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 07/19/2022] [Indexed: 06/15/2023]
Abstract
We report an excellent realization of the highly nonclassical incommensurate spin-density wave (SDW) state in the quantum frustrated antiferromagnetic insulator Cs_{2}CoBr_{4}. In contrast to the well-known Ising spin chain case, here the SDW is stabilized by virtue of competing planar in-chain anisotropies and frustrated interchain exchange. Adjacent to the SDW phase is a broad m=1/3 magnetization plateau that can be seen as a commensurate locking of the SDW state into the up-up-down (UUD) spin structure. This represents the first example of the long-sought SDW-UUD transition in triangular-type quantum magnets.
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Affiliation(s)
- L Facheris
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - K Yu Povarov
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - S D Nabi
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - D G Mazzone
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - J Lass
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
- Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - B Roessli
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - E Ressouche
- Université Grenoble Alpes, CEA, IRIG, MEM, MDN, 38000 Grenoble, France
| | - Z Yan
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - S Gvasaliya
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - A Zheludev
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
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3
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Léger M, Lhotel E, Ciomaga Hatnean M, Ollivier J, Wildes AR, Raymond S, Ressouche E, Balakrishnan G, Petit S. Spin Dynamics and Unconventional Coulomb Phase in Nd_{2}Zr_{2}O_{7}. Phys Rev Lett 2021; 126:247201. [PMID: 34213921 DOI: 10.1103/physrevlett.126.247201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 04/15/2021] [Accepted: 05/17/2021] [Indexed: 06/13/2023]
Abstract
We investigate the temperature dependence of the spin dynamics in the pyrochlore magnet Nd_{2}Zr_{2}O_{7} by neutron scattering experiments. At low temperature, this material undergoes a transition towards an "all-in-all-out" antiferromagnetic phase and the spin dynamics encompass a dispersionless mode, characterized by a dynamical spin ice structure factor. Unexpectedly, this mode is found to survive above T_{N}≈300 mK. Concomitantly, elastic correlations of the spin ice type develop. These are the signatures of a peculiar correlated paramagnetic phase which can be considered as a new example of Coulomb phase. Our observations near T_{N} do not reproduce the signatures expected for a Higgs transition, but show reminiscent features of the "all-in-all-out" order superimposed on a Coulomb phase.
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Affiliation(s)
- M Léger
- Institut Néel, CNRS and Université Grenoble Alpes, 38000 Grenoble, France
- Laboratoire Léon Brillouin, Université Paris-Saclay, CNRS, CEA, CE-Saclay, F-91191 Gif-sur-Yvette, France
| | - E Lhotel
- Institut Néel, CNRS and Université Grenoble Alpes, 38000 Grenoble, France
| | - M Ciomaga Hatnean
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - J Ollivier
- Institut Laue Langevin, F-38042 Grenoble, France
| | - A R Wildes
- Institut Laue Langevin, F-38042 Grenoble, France
| | - S Raymond
- Université Grenoble Alpes, CEA, IRIG, MEM, MDN, 38000 Grenoble, France
| | - E Ressouche
- Université Grenoble Alpes, CEA, IRIG, MEM, MDN, 38000 Grenoble, France
| | - G Balakrishnan
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - S Petit
- Laboratoire Léon Brillouin, Université Paris-Saclay, CNRS, CEA, CE-Saclay, F-91191 Gif-sur-Yvette, France
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Beauvois K, Simonet V, Petit S, Robert J, Bourdarot F, Gospodinov M, Mukhin AA, Ballou R, Skumryev V, Ressouche E. Dimer Physics in the Frustrated Cairo Pentagonal Antiferromagnet Bi_{2}Fe_{4}O_{9}. Phys Rev Lett 2020; 124:127202. [PMID: 32281858 DOI: 10.1103/physrevlett.124.127202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 01/13/2020] [Accepted: 02/28/2020] [Indexed: 06/11/2023]
Abstract
The research field of magnetic frustration is dominated by triangle-based lattices but exotic phenomena can also be observed in pentagonal networks. A peculiar noncollinear magnetic order is indeed known to be stabilized in Bi_{2}Fe_{4}O_{9} materializing a Cairo pentagonal lattice. We present the spin wave excitations in the magnetically ordered state, obtained by inelastic neutron scattering. They reveal an unconventional excited state related to local precession of pairs of spins. The magnetic excitations are then modeled to determine the superexchange interactions for which the frustration is indeed at the origin of the spin arrangement. This analysis unveils a hierarchy in the interactions, leading to a paramagnetic state (close to the Néel temperature) constituted of strongly coupled dimers separated by much less correlated spins. This produces two types of response to an applied magnetic field associated with the two nonequivalent Fe sites, as observed in the magnetization distributions obtained using polarized neutrons.
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Affiliation(s)
- K Beauvois
- Université Grenoble Alpes, CEA, IRIG, MEM, MDN, 38000 Grenoble, France
- Institut Néel, CNRS and Université Grenoble Alpes, 38000 Grenoble, France
| | - V Simonet
- Institut Néel, CNRS and Université Grenoble Alpes, 38000 Grenoble, France
| | - S Petit
- Laboratoire Léon Brillouin, CEA-CNRS, Université Paris-Saclay, CE-Saclay, 91191 Gif sur Yvette, France
| | - J Robert
- Institut Néel, CNRS and Université Grenoble Alpes, 38000 Grenoble, France
| | - F Bourdarot
- Université Grenoble Alpes, CEA, IRIG, MEM, MDN, 38000 Grenoble, France
| | - M Gospodinov
- Institute of Solid State Physics, Bulgarian Academy of Sciences, 1184 Sofia, Bulgaria
| | - A A Mukhin
- Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia
| | - R Ballou
- Institut Néel, CNRS and Université Grenoble Alpes, 38000 Grenoble, France
| | - V Skumryev
- Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats, 08010 Bellaterra, Barcelona, Spain
| | - E Ressouche
- Université Grenoble Alpes, CEA, IRIG, MEM, MDN, 38000 Grenoble, France
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5
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Bettler S, Landolt F, Aksoy ÖM, Yan Z, Gvasaliya S, Qiu Y, Ressouche E, Beauvois K, Raymond S, Ponomaryov AN, Zvyagin SA, Zheludev A. Magnetic structure and spin waves in the frustrated ferro-antiferromagnet Pb 2VO(PO 4) 2. Phys Rev B 2019; 99:10.1103/physrevb.99.184437. [PMID: 32118124 PMCID: PMC7047833 DOI: 10.1103/physrevb.99.184437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Single crystal neutron diffraction, inelastic neutron scattering, and electron spin resonance experiments are used to study the magnetic structure and spin waves in Pb2VO(PO4)2, a prototypical layered S = 1/2 ferromagnet with frustrating next-nearest neighbor antiferromagnetic interactions. The observed excitation spectrum is found to be inconsistent with a simple square lattice model previously proposed for this material. At least four distinct exchange coupling constants are required to reproduce the measured spin wave dispersion. The degree of magnetic frustration is correspondingly revised and found to be substantially smaller than in all previous estimates.
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Affiliation(s)
- S. Bettler
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - F. Landolt
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - Ö. M. Aksoy
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - Z. Yan
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - S. Gvasaliya
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - Y. Qiu
- NIST Centre for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20878, USA
| | - E. Ressouche
- Univ. Grenoble Alpes, CEA, INAC-MEM, 38000 Grenoble, France
| | - K. Beauvois
- Univ. Grenoble Alpes, CEA, INAC-MEM, 38000 Grenoble, France
| | - S. Raymond
- Univ. Grenoble Alpes, CEA, INAC-MEM, 38000 Grenoble, France
| | - A. N. Ponomaryov
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - S. A. Zvyagin
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - A. Zheludev
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
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Callies X, Ressouche E, Fonteneau C, Ducouret G, Pensec S, Bouteiller L, Creton C. Effect of the Strength of Stickers on Rheology and Adhesion of Supramolecular Center-Functionalized Polyisobutenes. Langmuir 2018; 34:12625-12634. [PMID: 30260654 DOI: 10.1021/acs.langmuir.8b02533] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In order to systematically investigate the effect of the strength of the supramolecular interactions on the debonding properties of associative polymers, a series of model systems have been characterized by probe-tack tests. These model materials, composed of linear and low dispersity poly(isobutylene) chains ( Mn ≈ 3 kg/mol) center-functionalized by a single bis-urea sticker, are able to self-assemble by four hydrogen bonds. Three types of stickers are used in the present study: a bis-urea with a methylene diphenyl (MDI) spacer, a bis-urea with a tolyl (TOL) spacer, and a bis-urea with a xylyl (XYL) spacer. In order to investigate the influence of stickers in depth, both the nanostructure of the materials and the linear rheology were investigated by small-angle X-ray scattering (SAXS) and oscillatory shear, respectively. For two types of stickers (TOL and XYL), the association of polymers via hydrogen bonds induces the formation of bundles of rodlike aggregates at room temperature and the behavior of a soft elastic material was observed. For bis-urea MDI, no structure is detected by SAXS and a Newtonian behavior is observed at room temperature. In probe-tack experiments, all these materials show a cohesive mode of failure, a signature of flowing materials as previously observed for tri-urea center-functionalized poly(butylacrylate) (PnBA3U). However, XYL center-functionalized polyisobutene shows much higher debonding energies than PnBA3U, revealing the importance of the strength of noncovalent bonds in the scission/recombination dynamics. On the basis of the analysis of the debonding images, this effect is discussed via the mechanical behavior at large deformation.
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Affiliation(s)
- X Callies
- Laboratoire de Sciences et Ingénierie de la Matière Molle, CNRS, ESPCI Paris, PSL Research University , 10 rue Vauquelin , 75005 Paris , France
- Laboratoire Sciences et Ingénierie de la Matière Molle , Sorbonne-Université , 10 rue Vauquelin , 75005 Paris , France
| | - E Ressouche
- Sorbonne Université, CNRS, IPCM, Chimie des Polymères , F-75005 Paris , France
| | - C Fonteneau
- Sorbonne Université, CNRS, IPCM, Chimie des Polymères , F-75005 Paris , France
| | - G Ducouret
- Laboratoire de Sciences et Ingénierie de la Matière Molle, CNRS, ESPCI Paris, PSL Research University , 10 rue Vauquelin , 75005 Paris , France
- Laboratoire Sciences et Ingénierie de la Matière Molle , Sorbonne-Université , 10 rue Vauquelin , 75005 Paris , France
| | - S Pensec
- Sorbonne Université, CNRS, IPCM, Chimie des Polymères , F-75005 Paris , France
| | - L Bouteiller
- Sorbonne Université, CNRS, IPCM, Chimie des Polymères , F-75005 Paris , France
| | - C Creton
- Laboratoire de Sciences et Ingénierie de la Matière Molle, CNRS, ESPCI Paris, PSL Research University , 10 rue Vauquelin , 75005 Paris , France
- Laboratoire Sciences et Ingénierie de la Matière Molle , Sorbonne-Université , 10 rue Vauquelin , 75005 Paris , France
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Lhotel E, Petit S, Ciomaga Hatnean M, Ollivier J, Mutka H, Ressouche E, Lees MR, Balakrishnan G. Evidence for dynamic kagome ice. Nat Commun 2018; 9:3786. [PMID: 30224640 PMCID: PMC6141606 DOI: 10.1038/s41467-018-06212-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 08/03/2018] [Indexed: 11/09/2022] Open
Abstract
The search for two-dimensional quantum spin liquids, exotic magnetic states remaining disordered down to zero temperature, has been a great challenge in frustrated magnetism over the last few decades. Recently, evidence for fractionalized excitations, called spinons, emerging from these states has been observed in kagome and triangular antiferromagnets. In contrast, quantum ferromagnetic spin liquids in two dimensions, namely quantum kagome ices, have been less investigated, yet their classical counterparts exhibit amazing properties, magnetic monopole crystals as well as magnetic fragmentation. Here, we show that applying a magnetic field to the pyrochlore oxide Nd2Zr2O7, which has been shown to develop three-dimensional quantum magnetic fragmentation in zero field, results in a dimensional reduction, creating a dynamic kagome ice state: the spin excitation spectrum determined by neutron scattering encompasses a flat mode with a six arm shape akin to the kagome ice structure factor, from which dispersive branches emerge.
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Affiliation(s)
- E Lhotel
- Institut Néel CNRS, Université Grenoble Alpes, 38042, Grenoble, France.
| | - S Petit
- Laboratoire Léon Brillouin, CEA CNRS Université Paris Saclay, CE-Saclay, 91191, Gif-sur-Yvette, France.
| | | | - J Ollivier
- Institut Laue Langevin, F-38042, Grenoble, France
| | - H Mutka
- Institut Laue Langevin, F-38042, Grenoble, France
| | - E Ressouche
- INAC, CEA, Université Grenoble Alpes, CEA Grenoble, F-38054, Grenoble, France
| | - M R Lees
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
| | - G Balakrishnan
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
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8
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Wildes AR, Simonet V, Ressouche E, Ballou R, McIntyre GJ. The magnetic properties and structure of the quasi-two-dimensional antiferromagnet CoPS 3. J Phys Condens Matter 2017; 29:455801. [PMID: 28872055 DOI: 10.1088/1361-648x/aa8a43] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The magnetic properties and magnetic structure are presented for CoPS3, a quasi-two-dimensional antiferromagnet on a honeycomb lattice with a Néel temperature of [Formula: see text] K. The compound is shown to have XY-like anisotropy in its susceptibility, and the anisotropy is analysed to extract crystal field parameters. For temperatures between 2 K and 300 K, no phase transitions were observed in the field-dependent magnetization up to 10 Tesla. Single-crystal neutron diffraction shows that the magnetic propagation vector is k = [Formula: see text] with the moments mostly along the [Formula: see text] axis and with a small component along the [Formula: see text] axis, which largely verifies the previously-published magnetic structure for this compound. The magnetic Bragg peak intensity decreases with increasing temperature as a power law with exponent [Formula: see text] for [Formula: see text].
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Affiliation(s)
- A R Wildes
- Institut Laue-Langevin, CS 20156, 38042 Grenoble Cédex 9, France
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9
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Chattopadhyay S, Petit S, Ressouche E, Raymond S, Balédent V, Yahia G, Peng W, Robert J, Lepetit MB, Greenblatt M, Foury-Leylekian P. 3d-4f coupling and multiferroicity in frustrated Cairo Pentagonal oxide DyMn 2O 5. Sci Rep 2017; 7:14506. [PMID: 29109510 PMCID: PMC5674039 DOI: 10.1038/s41598-017-15150-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 10/16/2017] [Indexed: 11/11/2022] Open
Abstract
In solid state science, multifunctional materials and especially multiferroics have attracted a great deal of attention, as they open the possibility for next generation spintronic and data storage devices. Interestingly, while many of them host coexisting 3d and 4f elements, the role of the coupling between these two magnetic entities has remained elusive. By means of single crystal neutron diffraction and inelastic neutron scattering experiments we shed light on this issue in the particular case of the multiferroic oxide DyMn2O5. This compound undergoes a first order magnetic transition from a high temperature incommensurate phase to a low temperature commensurate one. Our investigation reveals that although these two phases have very different magnetic structures, the spin excitations are quite similar indicating a fragile low temperature ground state with respect to the high temperature one. Such a rare scenario is argued to be a manifestation of the competition between the exchange interaction and 4f magnetic anisotropy present in the system. It is concluded that the magnetic structure, hence the ferroelectricity, can be finely tuned depending on the anisotropy of the rare earth.
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Affiliation(s)
- S Chattopadhyay
- INAC-MEM, CEA-Grenoble and Université Grenoble Alpes, F-38000, Grenoble, France.
| | - S Petit
- Laboratoire Léon Brillouin, CEA, CNRS, Université Paris-Saclay, CE-Saclay, F-91191, Gif-sur-Yvette, Cedex, France
| | - E Ressouche
- INAC-MEM, CEA-Grenoble and Université Grenoble Alpes, F-38000, Grenoble, France
| | - S Raymond
- INAC-MEM, CEA-Grenoble and Université Grenoble Alpes, F-38000, Grenoble, France
| | - V Balédent
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405, Orsay, cedex, France
| | - G Yahia
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405, Orsay, cedex, France
| | - W Peng
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405, Orsay, cedex, France
| | - J Robert
- Institut Néel, CNRS and Université Grenoble Alpes, 38042, Grenoble, cedex 9, France
| | - M-B Lepetit
- Institut Néel, CNRS and Université Grenoble Alpes, 38042, Grenoble, cedex 9, France
| | - M Greenblatt
- Department of Chemistry and Chemical Biology, Rutgers, the State University of New Jersey, Piscataway, NJ, 08854, USA
| | - P Foury-Leylekian
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405, Orsay, cedex, France
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10
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Lhotel E, Petit S, Guitteny S, Florea O, Ciomaga Hatnean M, Colin C, Ressouche E, Lees MR, Balakrishnan G. Fluctuations and All-In-All-Out Ordering in Dipole-Octupole Nd(2)Zr(2)O(7). Phys Rev Lett 2015; 115:197202. [PMID: 26588409 DOI: 10.1103/physrevlett.115.197202] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Indexed: 06/05/2023]
Abstract
By means of neutron scattering and magnetization measurements down to 90 mK, we determine the magnetic ground state of the spin-ice candidate Nd(2)Zr(2)O(7). We show that, despite ferromagnetic interactions, Nd(2)Zr(2)O(7) undergoes a transition around 285 mK towards an all-in-all-out antiferromagnetic state, with a strongly reduced ordered magnetic moment. We establish the (H,T) phase diagram in the three directions of the applied field and reveal a metamagnetic transition around 0.1 T, associated with an unexpected shape of the magnetization curves. We propose that this behavior results from the peculiar nature of the Nd^{3+} doublet, a dipolar-octupolar doublet, different from the standard Kramers doublet studied to date, thus revealing the importance of multipolar correlations in the properties of pyrochlore oxides.
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Affiliation(s)
- E Lhotel
- CNRS, Institut NEEL, F-38000 Grenoble, France
| | - S Petit
- Laboratoire Léon Brillouin, CEA-CNRS UMR 12, CE-Saclay, F-91191 Gif-sur-Yvette, France
| | - S Guitteny
- Laboratoire Léon Brillouin, CEA-CNRS UMR 12, CE-Saclay, F-91191 Gif-sur-Yvette, France
| | - O Florea
- CNRS, Institut NEEL, F-38000 Grenoble, France
| | - M Ciomaga Hatnean
- Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom
| | - C Colin
- CNRS, Institut NEEL, F-38000 Grenoble, France
- Univ. Grenoble Alpes, Institut NEEL, F-38000 Grenoble, France
| | - E Ressouche
- INAC SPSMS, CEA and Université Joseph Fourier, F-38000 Grenoble, France
| | - M R Lees
- Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom
| | - G Balakrishnan
- Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom
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11
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Chaix L, de Brion S, Petit S, Ballou R, Regnault LP, Ollivier J, Brubach JB, Roy P, Debray J, Lejay P, Cano A, Ressouche E, Simonet V. Magneto- to electroactive transmutation of spin waves in ErMnO3. Phys Rev Lett 2014; 112:137201. [PMID: 24745450 DOI: 10.1103/physrevlett.112.137201] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Indexed: 06/03/2023]
Abstract
The low-energy dynamical properties of the multiferroic hexagonal perovskite ErMnO3 have been studied by inelastic neutron scattering as well as terahertz and far infrared spectroscopies on a synchrotron source. From these complementary techniques, we have determined the magnon and crystal field spectra and identified a zone center magnon excitable only by the electric field of an electromagnetic wave. Using a comparison with the isostructural YMnO3 compound and crystal field calculations, we propose that this dynamical magnetoelectric process is due to the hybridization of a magnon with an electroactive crystal field transition.
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Affiliation(s)
- L Chaix
- Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble, France and Université Grenoble Alpes, Institut Néel, 38042 Grenoble, France and CNRS, Institut Néel, 38042 Grenoble, France
| | - S de Brion
- Université Grenoble Alpes, Institut Néel, 38042 Grenoble, France and CNRS, Institut Néel, 38042 Grenoble, France
| | - S Petit
- CEA, Centre de Saclay, DSM/IRAMIS/Laboratoire Léon Brillouin, 91191 Gif-sur-Yvette, France
| | - R Ballou
- Université Grenoble Alpes, Institut Néel, 38042 Grenoble, France and CNRS, Institut Néel, 38042 Grenoble, France
| | - L-P Regnault
- SPSMS-MDN, UMR-E CEA/UJF-Grenoble, INAC, 38054 Grenoble, France
| | - J Ollivier
- Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble, France
| | - J-B Brubach
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin, 91192 Gif-sur-Yvette, France
| | - P Roy
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin, 91192 Gif-sur-Yvette, France
| | - J Debray
- Université Grenoble Alpes, Institut Néel, 38042 Grenoble, France and CNRS, Institut Néel, 38042 Grenoble, France
| | - P Lejay
- Université Grenoble Alpes, Institut Néel, 38042 Grenoble, France and CNRS, Institut Néel, 38042 Grenoble, France
| | - A Cano
- European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP 220, 38043 Grenoble, France and CNRS, Université Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France
| | - E Ressouche
- SPSMS-MDN, UMR-E CEA/UJF-Grenoble, INAC, 38054 Grenoble, France
| | - V Simonet
- Université Grenoble Alpes, Institut Néel, 38042 Grenoble, France and CNRS, Institut Néel, 38042 Grenoble, France
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12
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Prokeš K, Petříček V, Ressouche E, Hartwig S, Ouladdiaf B, Mydosh JA, Hoffmann RD, Huang YK, Pöttgen R. (3 + 1)-dimensional crystal and antiferromagnetic structures in CeRuSn. J Phys Condens Matter 2014; 26:122201. [PMID: 24594580 DOI: 10.1088/0953-8984/26/12/122201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
At 320 K, the crystal structure of CeRuSn is commensurate with the related CeCoAl-type of structure by the doubling of the c lattice parameter. However, with lowering the temperature it becomes incommensurate with x and z position parameters at all three elemental sites being modulated as one moves along the c-axis. The resulting crystal structure can be conveniently described within the superspace formalism in (3 + 1) dimensions. The modulation vector, after initially strong temperature dependence, approaches a value close to qnuc = (0 0 0.35). Below TN = 2.8 (1) K, CeRuSn orders antiferromagnetically with a propagation vector qmag = (0 0 0.175), i.e. with the magnetic unit cell doubled along the c-axis direction with respect to the incommensurate crystal structure. Ce moments appear to be nearly collinear, confined to the a-c plane, forming ferromagnetically coupled pairs. Their magnitudes are modulated between 0.11 and 0.95 μB as one moves along the c-axis.
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Affiliation(s)
- K Prokeš
- Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, M-AQM, D-14109 Berlin, Germany
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13
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Khalyavin DD, Lovesey SW, Dobrynin AN, Ressouche E, Ballou R, Flouquet J. Symmetry-protected hidden order and magnetic neutron Bragg diffraction by URu2Si2. J Phys Condens Matter 2014; 26:046003. [PMID: 24390171 DOI: 10.1088/0953-8984/26/4/046003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We investigate how the order parameter of a continuous phase transition can be protected from view by symmetry in a magnetic crystal. The symmetry in question forbids atomic displacements and formation of magnetic dipoles, rendering the order parameter invisible in standard x-ray and magnetic neutron Bragg diffraction. Analysis of the allowed magnetic space-groups reveals exact properties of the hidden order parameter. We demonstrate that Bragg spots forbidden by the chemical structure can unveil magnetic hidden order. The method is applied to URu2Si2, which has been thoroughly investigated in the past few decades using all manner of experimental techniques. Starting from the established chemical structure of URu2Si2, we have performed a critical analysis of available data for magnetic neutron Bragg diffraction.
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14
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Tsyrulin N, Batista CD, Zapf VS, Jaime M, Hansen BR, Niedermayer C, Rule KC, Habicht K, Prokes K, Kiefer K, Ressouche E, Paduan-Filho A, Kenzelmann M. Neutron study of the magnetism in NiCl2·4SC(NH2)2. J Phys Condens Matter 2013; 25:216008. [PMID: 23649209 DOI: 10.1088/0953-8984/25/21/216008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We study the strongly anisotropic quasi-one-dimensional S = 1 quantum magnet NiCl2·4SC(NH2)2 using elastic and inelastic neutron scattering. We demonstrate that a magnetic field splits the excited doublet state and drives the lower doublet state to zero energy at a critical field Hc1. For Hc1 < H < Hc2, where Hc2 indicates the transition to a fully magnetized state, three-dimensional magnetic order is established with the AF moment perpendicular to the magnetic field. We mapped the temperature/magnetic field phase diagram, and we find that the total ordered magnetic moment reaches m(tot) = 2.1 μB at the field μ(0)H = 6 T and is thus close to the saturation value of the fully ordered moment. We study the magnetic spin dynamics in the fully magnetized state for H > Hc2, and we demonstrate the presence of an AF interaction between Ni(2+) on the two interpenetrating sublattices. In the antiferromagnetically ordered phase, the spin-waves that develop from the lower-energy doublet are split into two modes. This is most likely the result of the presence of the AF interaction between the interpenetrating lattices.
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Affiliation(s)
- N Tsyrulin
- Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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15
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Ressouche E, Ballou R, Bourdarot F, Aoki D, Simonet V, Fernandez-Diaz MT, Stunault A, Flouquet J. Hidden order in URu2Si2 unveiled. Phys Rev Lett 2012; 109:067202. [PMID: 23006299 DOI: 10.1103/physrevlett.109.067202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Indexed: 06/01/2023]
Abstract
We report on measurements, by polarized neutron elastic scattering, of the magnetization distribution induced in a single crystal of URu2Si2 under a magnetic field applied along the tetragonal c axis. A subtle change in this distribution, revealed by maximum entropy analysis of the data, is found when the temperature is decreased to the range of the hidden order. An analysis in terms of U(4+) ionic states reveals that this change is a fingerprint of a freezing of rank 5 multipoles, i.e., dotriacontapoles.
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Affiliation(s)
- E Ressouche
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble F-38054, France
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16
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Burzurí E, Luis F, Barbara B, Ballou R, Ressouche E, Montero O, Campo J, Maegawa S. Magnetic dipolar ordering and quantum phase transition in an Fe8 molecular magnet. Phys Rev Lett 2011; 107:097203. [PMID: 21929265 DOI: 10.1103/physrevlett.107.097203] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2010] [Indexed: 05/31/2023]
Abstract
We show that a crystal of mesoscopic Fe(8) single-molecule magnets is an experimental realization of the quantum Ising model in a transverse field, with dipolar interactions. Quantum annealing has enabled us to explore the quantum and classical phase transitions between the paramagnetic and ferromagnetic phases, at thermodynamical equilibrium. The phase diagram and critical exponents that we obtain agree with expectations for the mean-field universality class.
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Affiliation(s)
- E Burzurí
- Instituto de Ciencia de Materiales de Aragón, C.S.I.C.-Universidad de Zaragoza, and Departamento de Física de la Materia Condensada, Universidad de Zaragoza, E-50009 Zaragoza, Spain
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17
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Urcelay-Olabarria I, Ressouche E, García-Muñoz JL, Skumryev V. Magnetic structures of the Co +2doped Mn 1−xCo xWO 4wolframites. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311079700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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18
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Loire M, Simonet V, Petit S, Marty K, Bordet P, Lejay P, Ollivier J, Enderle M, Steffens P, Ressouche E, Zorko A, Ballou R. Parity-broken chiral spin dynamics in Ba₃NbFe₃Si₂O₁₄. Phys Rev Lett 2011; 106:207201. [PMID: 21668258 DOI: 10.1103/physrevlett.106.207201] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Revised: 12/22/2010] [Indexed: 05/30/2023]
Abstract
The spin-wave excitations emerging from the chiral helically modulated 120° magnetic order in a langasite Ba₃NbFe₃Si₂O₁₄ enantiopure crystal were investigated by unpolarized and polarized inelastic neutron scattering. A dynamical fingerprint of the chiral ground state is obtained, singularized by (i) spectral weight asymmetries answerable to the structural chirality and (ii) a full chirality of the spin correlations observed over the whole energy spectrum. The intrinsic chiral nature of the spin waves' elementary excitations is shown in the absence of macroscopic time-reversal symmetry breaking.
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Affiliation(s)
- M Loire
- Institut Néel, CNRS and Université Joseph Fourier, BP166, 38042 Grenoble Cedex 9, France
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19
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Kenzelmann M, Gerber S, Egetenmeyer N, Gavilano JL, Strässle T, Bianchi AD, Ressouche E, Movshovich R, Bauer ED, Sarrao JL, Thompson JD. Evidence for a magnetically driven superconducting Q phase of CeCoIn5. Phys Rev Lett 2010; 104:127001. [PMID: 20366558 DOI: 10.1103/physrevlett.104.127001] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2009] [Indexed: 05/29/2023]
Abstract
We have studied the magnetic order inside the superconducting phase of CeCoIn5 for fields along the [1 0 0] crystallographic direction using neutron diffraction. We find a spin-density wave order with an incommensurate modulation Q=(q,q,1/2) and q=0.45(1), which within our experimental uncertainty is indistinguishable from the spin-density wave found for fields applied along [1 -1 0]. The magnetic order is thus modulated along the lines of nodes of the d{x{2}-y{2}} superconducting order parameter, suggesting that it is driven by the electron nesting along the superconducting line nodes. We postulate that the onset of magnetic order leads to reconstruction of the superconducting gap function and a magnetically induced pair density wave.
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Affiliation(s)
- M Kenzelmann
- Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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20
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Ressouche E, Simonet V, Canals B, Gospodinov M, Skumryev V. Magnetic frustration in an iron-based Cairo pentagonal lattice. Phys Rev Lett 2009; 103:267204. [PMID: 20366341 DOI: 10.1103/physrevlett.103.267204] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2009] [Indexed: 05/29/2023]
Abstract
The Fe3+ lattice in the Bi2Fe4O9 compound is found to materialize the first analogue of a magnetic pentagonal lattice. Because of its odd number of bonds per elemental brick, this lattice, subject to first neighbor antiferromagnetic interactions, is prone to geometric frustration. The Bi2Fe4O9 magnetic properties have been investigated by macroscopic magnetic measurements and neutron diffraction. The observed noncollinear magnetic arrangement is related to the one stabilized on a perfect tiling as obtained from a mean field analysis with direct space magnetic configuration calculations. The peculiarity of this structure arises from the complex connectivity of the pentagonal lattice, a novel feature compared to the well-known case of triangle-based lattices.
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Affiliation(s)
- E Ressouche
- CEA/Grenoble, INAC/SPSMS-MDN, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France.
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21
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Smirnov AI, Svistov LE, Prozorova LA, Zheludev A, Lumsden MD, Ressouche E, Petrenko OA, Nishikawa K, Kimura S, Hagiwara M, Kindo K, Shapiro AY, Demianets LN. Chiral and collinear ordering in a distorted triangular antiferromagnet. Phys Rev Lett 2009; 102:037202. [PMID: 19257385 DOI: 10.1103/physrevlett.102.037202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2008] [Indexed: 05/27/2023]
Abstract
Magnetization, specific heat, and neutron diffraction measurements are used to map out the entire magnetic phase diagram of KFe(MoO4)2. This stacked triangular antiferromagnet is structurally similar to the famous multiferroic system RbFe(MoO4)2. Because of an additional small crystallographic distortion, it contains two sets of inequivalent distorted magnetic triangular lattices. As a result, the spin network breaks down into two intercalated yet almost independent magnetic subsystems. One is a collinear antiferromagnet that shows a simple spin-flop behavior in applied magnetic fields. The other is a helimagnet that instead goes through a series of exotic commensurate-incommensurate phase transformations. In the various phases one observes either true three-dimensional or unconventional quasi-two-dimensional ordering.
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Affiliation(s)
- A I Smirnov
- P. L. Kapitza Institute for Physical Problems RAS, 119334 Moscow, Russia
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22
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Marty K, Simonet V, Ressouche E, Ballou R, Lejay P, Bordet P. Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14. Phys Rev Lett 2008; 101:247201. [PMID: 19113658 DOI: 10.1103/physrevlett.101.247201] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Indexed: 05/27/2023]
Abstract
A novel doubly chiral magnetic order is found in the structurally chiral langasite compound Ba3NbFe3Si2O14. The magnetic moments are distributed over planar frustrated triangular lattices of triangle units. On each of these they form the same triangular configuration. This ferrochiral arrangement is helically modulated from plane to plane. Unpolarized neutron scattering on a single crystal associated with spherical neutron polarimetry proved that a single triangular chirality together with a single helicity is stabilized in an enantiopure crystal. A mean-field analysis allows us to discern the relevance on this selection of a twist in the plane to plane super-superexchange paths.
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Affiliation(s)
- K Marty
- Institut Néel, CNRS and Université Joseph Fourier, BP166, 38042 Grenoble, France
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23
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Gillon B, Sangregorio C, Caneschi A, Gatteschi D, Sessoli R, Ressouche E, Pontillon Y. Experimental spin density in the high spin ground state of the Fe8pcl cluster. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2007.01.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
The magnetically ordered ground state of CeRhIn(5) at ambient pressure and zero magnetic field is an incommensurate helicoidal phase with the propagation vector k = (1/2,1/2,0.298) and the magnetic moment in the basal plane of the tetragonal structure. We determined by neutron diffraction the two different magnetically ordered phases of CeRhIn(5) evidenced by bulk measurements under applied magnetic field in the basal plane. The low temperature high magnetic phase corresponds to a commensurate sine-wave structure of the magnetization with k = (1/2,1/2,1/4). At high temperature, the phase is incommensurate with k = (1/2,1/2,0.298) and a possible small ellipticity. The propagation vector of this phase is the same as that of the zero-field structure.
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Affiliation(s)
- S Raymond
- CEA-Grenoble, DRFMC, SPSMS, 38054 Grenoble Cedex 9, France
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25
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Garlea VO, Zheludev A, Masuda T, Manaka H, Regnault LP, Ressouche E, Grenier B, Chung JH, Qiu Y, Habicht K, Kiefer K, Boehm M. Excitations from a Bose-Einstein condensate of magnons in coupled spin ladders. Phys Rev Lett 2007; 98:167202. [PMID: 17501456 DOI: 10.1103/physrevlett.98.167202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2006] [Revised: 01/29/2007] [Indexed: 05/15/2023]
Abstract
The weakly coupled quasi-one-dimensional spin ladder compound (CH3)2CHNH3CuCl3 is studied by neutron scattering in magnetic fields exceeding the critical field of Bose-Einstein condensation of magnons. Commensurate long-range order and the associated Goldstone mode are detected and found to be similar to those in reference to spin-dimer materials. However, for the upper two massive magnon branches, the observed behavior is totally different, culminating in a drastic collapse of excitation bandwidth beyond the transition point.
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Affiliation(s)
- V O Garlea
- Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA
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26
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Tabata Y, Kadowaki H, Matsuhira K, Hiroi Z, Aso N, Ressouche E, Fåk B. Kagomé ice state in the dipolar spin ice Dy2Ti2O7. Phys Rev Lett 2006; 97:257205. [PMID: 17280389 DOI: 10.1103/physrevlett.97.257205] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2006] [Indexed: 05/13/2023]
Abstract
We have investigated the kagomé ice behavior of the dipolar spin-ice compound Dy2Ti2O7 in a magnetic field along a [111] direction using neutron scattering and Monte Carlo simulations. The spin correlations show that the kagomé ice behavior predicted for the nearest-neighbor interacting model, where the field induces dimensional reduction and spins are frustrated in each two-dimensional kagomé lattice, occurs in the dipole interacting system. The spins freeze at low temperatures within the macroscopically degenerate ground states of the nearest-neighbor model.
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Affiliation(s)
- Y Tabata
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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27
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Affiliation(s)
- E. Ressouche
- a DRFMC/SPSMS/CENG , 85X, 38041 , Grenoble cedex , France
| | - A. Zheludev
- a DRFMC/SPSMS/CENG , 85X, 38041 , Grenoble cedex , France
| | | | - B. Gillon
- b Laboratoire Léon Brillouin, Unité associée CEA-CNRS , CEN-Saclay, 91191 , Gif sur Yvette , France
| | - P. Rey
- c DRFMC/SESAM/CENG , 85X, 38041 , Grenoble cedex , France
| | - J. Schweizer
- a DRFMC/SPSMS/CENG , 85X, 38041 , Grenoble cedex , France
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28
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Bonnet M, Luneau D, Ressouche E, Rey P, Schweizer J, Wan M, Wang H, Zheludev A. The Experimental Spin Density of Two Nitrophenyl Nitroxides: A Nitronyl Nitroxide and an Imino Nitroxide. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259508034037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- M. Bonnet
- a CEA/DRFMC/SPSMS/MDN,CENG , 17 rue des Martyrs, 38054 , Grenoble , Cedex 9 , France
| | - D. Luneau
- b CEA/DRFMC/SESAM, CENG , 17 rue des Martyrs, 38054 , Grenoble , Cedex 9 , France
| | - E. Ressouche
- a CEA/DRFMC/SPSMS/MDN,CENG , 17 rue des Martyrs, 38054 , Grenoble , Cedex 9 , France
| | - P. Rey
- b CEA/DRFMC/SESAM, CENG , 17 rue des Martyrs, 38054 , Grenoble , Cedex 9 , France
| | - J. Schweizer
- a CEA/DRFMC/SPSMS/MDN,CENG , 17 rue des Martyrs, 38054 , Grenoble , Cedex 9 , France
| | - M. Wan
- c Institute of Chemistry, Academia Sinica , Beijing , 100080 , China
| | - H. Wang
- c Institute of Chemistry, Academia Sinica , Beijing , 100080 , China
| | - A. Zheludev
- a CEA/DRFMC/SPSMS/MDN,CENG , 17 rue des Martyrs, 38054 , Grenoble , Cedex 9 , France
- d Brookhaven National Laboratory , Upton , NY , 11973 , USA
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Masuda T, Zheludev A, Grenier B, Imai S, Uchinokura K, Ressouche E, Park S. Cooperative ordering of gapped and gapless spin networks in Cu2Fe2Ge4O13. Phys Rev Lett 2004; 93:077202. [PMID: 15324269 DOI: 10.1103/physrevlett.93.077202] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2004] [Indexed: 05/24/2023]
Abstract
The unusual magnetic properties of a novel low-dimensional quantum ferrimagnet Cu2Fe2Ge4O13 are studied using bulk methods, neutron diffraction, and inelastic neutron scattering. It is shown that this material can be described in terms of two low-dimensional quantum spin subsystems, one gapped and the other gapless, characterized by two distinct energy scales. Long-range magnetic ordering observed at low temperatures is a cooperative phenomenon caused by weak coupling of these two spin networks.
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Affiliation(s)
- T Masuda
- Condensed Matter Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831-6393, USA.
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30
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Abstract
We report that the uniform magnetization is not conserved in the magnetic excitation spectrum of UGe2. The measured spectrum is therefore different from that in d-electron ferromagnetic metals in a way that would facilitate magnetically mediated superconductivity.
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31
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Ressouche E. Molecular magnetism, from neutron images to theory. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302085677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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32
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Schweizer J, Azuma N, Lelievre-Berna E, Ressouche E, Tomiyoshi S. Spin density investigation for a better determination of the magnetic structure. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302092875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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33
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Aoki D, Huxley A, Ressouche E, Braithwaite D, Flouquet J, Brison JP, Lhotel E, Paulsen C. Coexistence of superconductivity and ferromagnetism in URhGe. Nature 2001; 413:613-6. [PMID: 11595943 DOI: 10.1038/35098048] [Citation(s) in RCA: 152] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The discovery of superconductivity at high pressure (albeit over a restricted range) in the ferromagnetic material UGe2 raised the possibility that bulk superconductivity might be found in other ferromagnets. The exact symmetry of the paired state and the dominant mechanism responsible for the pairing, however, remain unidentified. Meanwhile, the conjecture that superconductivity could occur more generally in ferromagnets has been fuelled by the recent observation of a low-temperature transition that suggests an onset of superconductivity in high-quality crystals of the itinerant-ferromagnet ZrZn2 (ref. 2), although the thermodynamic signature of this transition could not be detected. Here we show that the ferromagnet URhGe is superconducting at ambient pressure. In this case, we find the thermodynamic signature of the transition-its form is consistent with a superconducting pairing of a spin-triplet type, although further testing with cleaner samples is needed to confirm this. The combination of superconductivity and ferromagnetism may thus be more common and consequently more important than hitherto realized.
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Affiliation(s)
- D Aoki
- CEA, Département de Recherche Fondamentale sur la Matière Condensée, SPSMS, 38054 Grenoble Cedex 9, France
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Zheludev A, Kenzelmann M, Raymond S, Ressouche E, Masuda T, Kakurai K, Maslov S, Tsukada I, Uchinokura K, Wildes A. Energy separation of single-particle and continuum states in an S = 1/2 weakly coupled chains antiferromagnet. Phys Rev Lett 2000; 85:4799-4802. [PMID: 11082655 DOI: 10.1103/physrevlett.85.4799] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2000] [Indexed: 05/23/2023]
Abstract
Inelastic neutron scattering is used to study transverse-polarized magnetic excitations in the quasi-one-dimensional S = 1/2 antiferromagnet BaCu2Si2O7, where the saturation value for the Neel order parameter is m(0) = 0.12&mgr;(B) per spin. At low energies the spectrum is totally dominated by resolution-limited spin-wave-like excitations. An excitation continuum sets in above a well-defined threshold frequency. Experimental results are discussed in the context of current theories for weakly interacting quantum half-integer-spin chains.
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Affiliation(s)
- A Zheludev
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
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35
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Bonville P, Abd-Elmeguid M, Malaman B, Ressouche E, Sanchez J, Geibel C, Trovarelli O. Incommensurate modulated magnetic structure in the heavy electron compound YbPtAl. Physica B: Condensed Matter 2000; 281-282:144-146. [DOI: 10.1016/s0921-4526(99)00864-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Abstract
Three-dimensional coordination network solids of MII[C(CN)3]2 (M = V, Cr) composition possess interpenetrating rutile-like network structures. Each [C(CN)3]- bonds to three different metal ions in a triangular array, affording a geometrical topology akin to a Kagomé lattice leading to competing spin exchange interactions and spin frustration. The crystal and magnetic structure of CrII[C(CN)3] was determined by Rietveld refinement of the powder neutron diffraction data at 2 and 15 K and belongs to the orthorhombic space group Pmna [a = 7.313(1) A, b = 5.453(1) A, c = 10.640(1) A, Z = 2, T = 15 K]. Each CrII has a tetragonally elongated octahedral structure with four Cr-N(1) distances of 2.077(2) A and two significantly longer axial Cr-N(2) distances of 2.452(2) A. Magnetic susceptibility measurements between 1.7 and 300 K reveal strong antiferromagnetic interactions for both V- and Cr[C(CN)3]2 with theta = -67 and -46 K, respectively, from a fit to the Curie-Weiss law. Long-range magnetic ordering does not occur for M = V above 1.7 K, in contrast to M = Cr, which antiferromagnetically orders at low temperature. This is attributed to Jahn-Teller distorted CrII site relieving frustration in one dimension, leading to 2-D Ising antiferromagnetism, as observed by both magnetic susceptibility and specific heat studies. Neutron diffraction experiments at 2 K for Cr[C(CN)3]2 yielded additional Bragg reflections as a result of antiferromagnetic ordering with the moments on the CrII atoms aligned parallel to c and 4.7(1) microB. Fitting of the magnetic order parameter to a power law yielded TN = 6.12(4) K and beta = 0.18(1) consistent with 2-D Ising behavior. A TN of 6.13 K is also observed from the specific heat data.
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Affiliation(s)
- J L Manson
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2124, Salt Lake City, Utah 84112-0850, USA
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