Influence of Dy3+ environment on magnetic anisotropy and magnetocaloric effect in Dy3⁢B2⁢C3⁢O12 (B=In, Sc, Te ; C=Ga, Al, Li) garnets F. Damay, S. Petit, D. Sheptyakov, C. V. Colin, E. Suard, S. Rols, J. Embs, U. Stuhr, D. Bounoua, O. Demortier, and C. Decorse, Phys. Rev. B 109 (2024) 014419   In the framework of the general phase diagram published recently for a pseudospin S = 1/2 on a hyperkagome network [Kibalin et al., Phys. Rev. Res.

Salah Bouazizi, Salah Nasr & Marie-Claire Bellissent-Funel MD simulation and analysis of the pair correlation functions, self-diffusion coefficients and orientational correlation times in aqueous KCl solutions at different temperatures and concentrations, S. Bouazizi, S. Nasr and M.-C. Bellissent-Funel, J Solution Chem (2024) https://doi.org/10.

Universality of q=1/2 orbital magnetism in the pseudogap phase of the high-Tc superconductor YBa2Cu3O6+x Dalila Bounoua, Yvan Sidis, Martin Boehm, Paul Steffens, Toshinao Loew, Lin Shan Guo, Jun Qian, Xin Yao, and Philippe Bourges, Phys. Rev. B 108 (2023) 214408. Several decades of debate have centered around the nature of the enigmatic pseudogap state in high-temperature superconducting copper oxides.

M. Warburton, J.M. Ablett, J.-P. Rueff, P. Baroni, L. Paolasini, L. Noirez We examine the influence at room temperature of the deposit of a water layer on the phonon dynamics of a solid. It is shown that the water wetting at the surface of an Alumina monocrystal has deep effects on acoustic phonons, propagating over several hundred µm distance and taking place on a relatively long time scale.

V. Balédent, A. Vaunat, S. Petit, L. Nataf, S. Chattopadhyay, S. Raymond, and P. Foury-Leylekian In this paper, we investigate the physical properties of the type-II multiferroic GdMn2O5 material by means of neutron scattering, electric polarization, and magnetization measurements. A complex (T,H) phase diagram shows up, with especially a field-induced magnetic transition around 11 T at low temperature.

A. Sazonov, H. Thoma, R. Dutta, M. Meven, A. Gukasov, R. Fittipaldi, V. Granata, T. Masuda, B. Nafradi, and V. Hutanu A detailed investigation of Ba2MnGe2O7 was performed in its low-temperature magnetoelectric state combining neutron diffraction with magnetization measurements on single crystals. In the paramagnetic state at 10 K, polarized neutron diffraction was applied to reveal the components of the susceptibility tensor.

Ellen Fogh, Bastian Klemke, Manfred Reehuis, Philippe Bourges, Christof Niedermayer, Sonja Holm-Dahlin, Oksana Zaharko, Jürg Schefer, Andreas B. Kristensen, Michael K. Sørensen, Sebastian Paeckel, Kasper S. Pedersen, Rasmus E. Hansen, Alexandre Pages, Kimmie K. Moerner, Giulia Meucci, Jian-Rui Soh, Alessandro Bombardi, David Vaknin, Henrik. M. Rønnow, Olav F. Syljuåsen, Niels B.

I. V. Golosovsky, I. A. Kibalin, A. Gukasov, A. G. Roca, A. López-Ortega, M. Estrader, M. Vasilakaki, K. N. Trohidou, T. C. Hansen, I. Puente-Orench, E. Lelièvre-Berna, J. Nogués Heterogeneous bi-magnetic nanostructured systems have had a sustained interest during the last decades owing to their unique magnetic properties and the wide range of derived potential applications. However, elucidating the details of their magnetic properties can be rather complex.

Le LLB et le SPEC s'équipent d'un four à image pour la croissance de monocristaux par la méthode de fusion de zone flottante. Cet équipement permettra de réaliser des monocristaux orientés de taille centimétrique et de haute pureté chimique, pour l’étude des matériaux quantiques (composés supraconducteurs, multiferroïques ou multifonctionnels...

Özge Azeri, Dennis Schönfeld, Bin Dai, Uwe Keiderling, Laurence Noirez and Michael Gradzielski Block copolymers synthesized via Atom Transfer Radical Polymerization from alkyl acrylate and t-butyl acrylate and the subsequent hydrolysis of the t-butyl acrylate to acrylic acid were systematically varied with respect to their hydrophobic part by the variation in the alkyl chain length and the degree of polymerisation in this block.

Eni Kume, Nicolas Martin, Peter Dunne, Patrick Baroni and Laurence Noirez Molecules 2022, 27(22), 7829. Mesoscopic shear elasticity has been revealed in ordinary liquids both experimentally by reinforcing the liquid/surface interfacial energy and theoretically by nonextensive models.

Déterminer le mécanisme à l'origine de la supraconductivité à haute température critique (Tc), découverte en 1986 dans des oxydes de cuivre , reste un défi majeur en physique au XXIe siècle.

I. Mirebeau et N. Martin, J. Appl. Cryst. (2022). 55, 1173-1183 The application is discussed of neutron methods to the study of reentrant spin glasses (RSGs), close to the transition towards a `canonical' spin glass (SG). The focus is on two emblematic systems, namely Au1−xFex and amorphous a-Fe1−xMnx. A set of experimental results is presented to highlight their peculiar static and dynamic properties.

Wen-Gen Zheng, Victor Balédent, Claire V. Colin, Françoise Damay, Jean-Pascal Rueff, Anne Forget, Dorothée Colson and Pascale Foury-Leylekian It has been recently observed that a superconducting phase emerges under pressure in the Fe-based spin-ladders BaFe2X3 (X = S, Se). The low dimensionality of the Fe spin-ladders, which simplifies the elaboration of theoretical models, should help to understand the mechanism of superconductivity.

E. Kume and L. Noirez We show that a confned viscous liquid emits a dynamic thermal response upon applying a low frequency (∼1 Hz) shear excitation. Hot and cold thermal waves are observed in situ at atmospheric pressure and room temperature, in a viscous liquid (polypropylene glycol) at various thicknesses ranging from 100 µm up to 340 µm, upon applying a mechanical oscillatory shear strain.

Une expérience proposée par des chercheurs de l'Université de l’Académie des sciences chinoise de Pékin en collaboration avec le CEA/Irig/D-Phy/MEM et le LLB révèle que les fluctuations du spin dans un supraconducteur à base de fer ont une direction privilégiée, ce qui suggère un mécanisme potentiel pour la supraconductivité dans ces matériaux.  

L'objectif visé dans la construction de la réalisation de sources compactes de neutrons à base d’accélérateurs à fort courant est de permettre de réaliser, sur ces sources, des expériences de diffusion de neutrons, avec pratiquement la même qualité que celles réalisées auprès des lignes neutrons issues de réacteurs de recherche de type Orphée*.

Les aimants mono-moléculaires suscitent une attention scientifique croissante et ceci depuis trois décennies. Ils diffèrent des aimants métalliques conventionnels par le fait que l'ordre magnétique ne résulte pas d'un ordre à longue distance, mais de la capacité d'alignement de chaque molécule individuelle.

Emil A. Klahn, Andreas M. Thiel, Rasmus B. Degn, Iurii Kibalin, Arsen Gukassov, Claire Wilson, Angelos B. Canaj, Mark Murrie and Jacob Overgaard We present the magnetic anisotropy of two isostructural pentagonal-bipyramidal complexes, [Ln(H2O)5(HMPA)2]I3·2HMPA (HMPA = hexamethylphosphoramide, Ln = Dy, Ho). Using ac magnetic susceptibility measurements, we find magnetic relaxation barriers of 600 K and 270 K for the Dy- and Ho-compounds, respectively.

Philipp Kurzhals, Geoffroy Kremer, Thomas Jaouen, Christopher W. Nicholson, Rolf Heid, Peter Nagel, John-Paul Castellan, Alexandre Ivanov, Matthias Muntwiler, Maxime Rumo, Bjoern Salzmann, Vladimir N. Strocov, Dmitry Reznik, Claude Monney & Frank Weber Electron-phonon coupling, i.e., the scattering of lattice vibrations by electrons and vice versa, is ubiquitous in solids and can lead to emergent ground states such as superconductivity and charge-density wave order.

Nécessaires à la réalisation de dispositifs quantiques aux propriétés originales, ou pour mettre en évidence des comportements originaux de la matière, les physiciens du solide explorent de nouveaux composés, à la recherche de matériaux aux propriétés nouvelles et spécifiquement quantiques.

Christopher D. O’Neill, Gino Abdul-Jabbar, Didier Wermeille, Philippe Bourges, Frank Krüger, and Andrew D. Huxley Quantum order by disorder revealed    Ferromagnets are ubiquitous in everyday life, present in household items ranging from fridge-magnets on a fridge door to the sensors and motors inside, while dozens can be found in an average car.

S. Biesenkamp, D. Gorkov, D. Brüning, A. Bertin, T. Fröhlich, X. Fabrèges, A. Gukasov ,M. Meven, P. Becker, L. Bohaty, T. Lorenz and M. Braden, Phys. Rev. B 103 (2021) 134412. The crystal and magnetic structures of multiferroic LiFe(WO4)2 were investigated by temperature and magnetic-field-dependent specific heat, susceptibility, and neutron diffraction experiments on single crystals.

Dalila Bounoua, Lucile Mangin-Thro, Jaehong Jeong, Romuald Saint-Martin, Loreynne Pinsard-Gaudart, Yvan Sidis & Philippe Bourges, Communications Physics 3, (2020) 123. New phases with broken discrete Ising symmetries are uncovered in quantum materials with strong electronic correlations.

Laëtitia Mayen, Nicholai D. Jensen, Maximilien Desbord, Danielle Laurencin, Christel Gervais, Christian Bonhomme, Mark E. Smith, Florence Porcher, Erik Elkaim, Cédric Charvillat, Pierre Gras, Christian Rey, Jérémy Soulié and Christèle Combes, CrystEngComm, 22 (2020) 3130-3143. α-Canaphite (CaNa2P2O7·4H2O) is a layered calcium disodium pyrophosphate tetrahydrate phase of significant geological and potential biological interest.

Alessio Zaccone and Laurence Noirez, J. Phys. Chem. Lett.12 (2021) 1, 650–657. Liquids confined to sub-millimeter scales have remained poorly understood. One of the most striking effects is the large elasticity revealed using good wetting conditions, which grows upon further decreasing the confinement length, L.

Jaehong Jeong, Benjamin Lenz, Arsen Gukasov, Xavier Fabrèges, Andrew Sazonov, Vladimir Hutanu, Alex Louat, Dalila Bounoua, Cyril Martins, Silke Biermann, Véronique Brouet, Yvan Sidis, and Philippe Bourges, Phys. Rev. Lett. 125 (2020) 097202. 5d iridium oxides are of huge interest due to the potential for new quantum states driven by strong spin-orbit coupling.

La thermoélasticité décrit la variation des propriétés élastiques d'un corps solide en fonction de sa température. Pour un fluide incompressible, les coefficients thermoélastiques, dilatation isobare et compressibilité isotherme, sont en pratique nuls.

K. Beauvois, V. Simonet, S. Petit, J. Robert, F. Bourdarot, M. Gospodinov, A.A. Mukhin, R. Ballou, V. Skumryev, and E. Ressouche 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 Bi2Fe4O9 materializing a Cairo pentagonal lattice.

Eni Kume, Patrick Baroni and Laurence Noirez, Scientific Reports 10 (2020) 13340. Thermo-elasticity couples the deformation of an elastic (solid) body to its temperature and viceversa. It is a solid-like property. Highlighting such property in liquids is a paradigm shift: it requires long-range collective interactions that are not considered in current liquid descriptions. The present microthermal studies provide evidence for such solid-like correlations.