J
Jean-François Létard
Researcher at University of Bordeaux
Publications - 181
Citations - 8380
Jean-François Létard is an academic researcher from University of Bordeaux. The author has contributed to research in topics: Spin crossover & LIESST. The author has an hindex of 47, co-authored 174 publications receiving 7809 citations. Previous affiliations of Jean-François Létard include University of Valencia & Ludwig Maximilian University of Munich.
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Journal ArticleDOI
Thermal spin transition in [ Fe ( N H 2 − trz ) 3 ] Br 2 investigated by spectroscopic ellipsometry
E. D. Loutete-Dangui,François Varret,Epiphane Codjovi,Pierre-Richard Dahoo,Hiroko Tokoro,Shin-ichi Ohkoshi,C. Eypert,Jean-François Létard,J. M. Coanga,Kamel Boukheddaden +9 more
TL;DR: In this article, the thermal hysteresis of a pelleted sample of the spin-crossover compound was investigated by means of spectroscopic ellipsometry, in the temperature range $264--358\phantom{\rule{0.3em}{0ex}}\mathrm{K} ).
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Activation of coherent lattice phonon following ultrafast molecular spin-state photo-switching: A molecule-to-lattice energy transfer
Andrea Marino,Marco Cammarata,Samir F. Matar,Jean-François Létard,Guillaume Chastanet,Matthieu Chollet,James M. Glownia,Henrik T. Lemke,Eric Collet +8 more
TL;DR: Time-resolved studies evidence a delayed activation of coherent optical phonons of the lattice surrounding the photoexcited molecules in the photo-switching dynamics of the [Fe(PM-AzA)2(NCS)2] spin-crossover molecular solid.
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Nanosecond study of spin state transition induced by a single nanosecond laser shot on [Fe(NH2trz)3] compounds inside and outside their thermal hysteresis loops
Geoffrey Galle,Jérôme Degert,Cindy Mauriac,Céline Etrillard,Jean-François Létard,Eric Freysz +5 more
TL;DR: In this article, the combination of a free running 80MHz femtosecond Ti-sapphire oscillator with a nanosecond Nd:YAG laser makes it possible to record in real time, with a nd time resolution, reversible or irreversible phase transitions photo-induced by a single laser pulse.
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Influence of Metal Dilution on the Light‐Induced Spin Transition in Two 1D Chain Compounds: [FexZn1–x(btzp)3](BF4)2 and [FexZn1–x(endi)3](BF4)2 {btzp = 1,2‐Bis(tetrazol‐1‐yl)propane and endi = 1,2‐Bis(tetrazol‐1‐yl)ethane}
Chérif Baldé,Cédric Desplanches,Matthias Grunert,Yongli Wei,Philipp Gütlich,Jean-François Létard +5 more
TL;DR: In this article, the thermal and light-induced spin transitions in [FexZn1-x(btzp)3]-BF4] chain compounds have been investigated by magnetic susceptibility, photomagnetism and diffuse reflectivity measurements.
Journal ArticleDOI
Study of the fast photoswitching of spin crossover nanoparticles outside and inside their thermal hysteresis loop
Geoffrey Galle,Céline Etrillard,Jérôme Degert,François Guillaume,Jean-François Létard,Eric Freysz +5 more
TL;DR: In this article, the low spin to high spin phase transition induced by nanosecond laser pulses outside and within the thermal hysteresis loop of the [Fe(Htrz)2 trz](BF4)2-H2O spin crossover nanoparticles was studied.