M. Guillaume Nataf

Chargé de recherche CNRS

UMR CNRS 7347 - Matériaux, microélectronique, acoustique, nanotechnologies (GREMAN)
UFR de Sciences et Techniques

Coordonnées

Tél: 0254552166
Mail: guillaume.nataf@univ-tours.fr

Discipline(s) enseignée(s)

Lecturer and demonstrator for master students in materials science (optics, Maxwell equations, Raman spectroscopy)
Demonstrator for undergraduate students in materials science (calorimetry, X-rays diffraction) and electronics

Thèmes de recherche

My research focuses on functional oxides (ferroelectrics and ferroelastics), whose outstanding properties result from a complex interaction between chemical compositions, crystallographic orientations and micro/nanostructures. I am particularly interested in micro/nanostructures (pores, domains, domain walls) and:

the evolution of their structural properties across phase transitions,
their response under constraint,
the characterisation and understanding of their own functionalities,
their role in thermal properties of materials.

Group members

Joachim Montoussé, PhD student (with the French company Soitec, co-supervised with Silvana Mercone, Kevin Nadaud, Micka Bah)

Vijaya Bhasker, PhD student (co-supervised with Fabien Giovannelli)

Anusri Anil, PhD student (co-supervised with Béatrice Negulescu, Jérôme Wolfman)

Nassima Radouane, postdoc

Previous group members

Lucile Féger, PhD student
Khalid Ait Ali, master student
Yersultan Rymkul, master student
Rachid Belrhiti-Nejjar, master student (now PhD student at GREMAN)
Edgar Chaslin, master student (now PhD student at University of Rennes)
Mehdi El Kamily, master student (now outreach coordinator at Espace Mendès-France)

Activités / CV

Key Publications

G. F. Nataf, S. Volz, J. Ordonez-Miranda, J. Íñiguez-González, R. Rurali, B. Dkhil. Using oxides to cumpute with heat. Nat. Rev. Mater. (2024) – doi: 10.1038/s41578-024-00690-1.
P. Limelette, M. El Kamily, H. Aramberri, F. Giovannelli, M. Royo, R. Rurali, I. Monot-Laffez, J.Íñiguez, G. F. Nataf. Influence of ferroelastic domain walls on thermal conductivity. Phys. Rev. B 108, 144104 (2023) – doi: 10.1103/PhysRevB.108.144104
G. F. Nataf, M. Guennou, J. M. Gregg, D. Meier, J. Hlinka, E. K. H. Salje, J. Kreisel. Domain-wall engineering and topological defects in ferroelectric and ferroelastic materials. Nature Reviews Physics 2, 634-648 (2020) – doi: 10.1038/s42254-020-0235-z
G. F. Nataf, M. Guennou, J. Kreisel, P. Hicher, R. Haumont, O. Aktas, E. K. H. Salje, L. Tortech, C. Mathieu, D. Martinotti, N. Barrett. Control of surface potential at polar domain walls in a nonpolar oxide. Phys. Rev. Mater. 1, 74410 (2017) – doi: 10.1103/PhysRevMaterials.1.074410
G. F. Nataf, P. O. Castillo-Villa, J. Baró, X. Illa, E. Vives, A. Planes, E. K. H. Salje. Avalanches in compressed porous SiO₂-based materials. Phys. Rev. E 90, 022405 (2014) – doi: 10.1103/PhysRevE.90.022405
E. K. H. Salje, M. Carpenter, G. F. Nataf, G. Picht, K. Webber, J. Weerasinghe, S. Lisenkov, L. Bellaiche. Elastic excitations in BaTiO3 single crystals and ceramics: Mobile domain boundaries and polar nanoregions observed by RUS. Phys. Rev. B 87, 014106 (2013) – doi: 10.1103/PhysRevB.87.01410

Invited talks

Tuning the thermal conductivity with an electric field. Ferroics and Mutiferroics: Exploring Emergent Phenomena at Nano and Pico Scales. Le Mans, France, 2024.
Avalanches of ferroelectric domain walls. Avalanche. Espoo, Finland, 2024.
Raman spectroscopy. ELENAM: Metrology at the nanoscale. Fréjus, France, 2024.
Ferroelectric and ferroelastic domain walls: interfaces to tune thermal conductivity. Energy transfer at interfaces. Paris, France, 2023.
Solid-state synthesis. EL NANO thematic school. Aussois, France, 2023.
Domain-wall engineering in multiferroic materials. Annual meeting of the German Physical Society on Condensed Matter Physics. Regensburg, Germany, 2022.
Avalanches in ferroelectric and ferroelastic materials. Avalanche dynamics and precursors of catastrophic events. Debrecen, Hungary, 2022.
Multiferroic domain walls in ferroelastic materials. 9th International Advances in Applied Physics & Materials Science Congress & Exhibition. Ölüdeniz, Turkey, 2019.
Towards giant barocaloric materials with low hysteresis. EMN Meeting on Caloric Materials. Lyon, France, 2018.
High-pressure calorimetric methods for barocaloric materials. Short Summer School on TA&C. Chisinau, Moldavia, 2017

Selected research projects

ERC Starting Grant (2023-2027): Ferroic Materials for Dynamic Heat Flow Control [leader]
EIC Pathfinder (2024-2028): First Regenerative Solid-State Barocaloric Refrigerator
ANR PRC (2024-2028): Study and sintering of molecular compounds for barocaloric refrigeration
APRIA (2022): Influence of domain walls on the thermal conductivity of ferroelectric oxides [leader]
1851 Research Fellowship (2018-2020): Colossal barocaloric effects in liquid crystals [leader]