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DTSTART;TZID=Europe/Paris:20260115T140000
DTEND;TZID=Europe/Paris:20260115T153000
DTSTAMP:20260413T010226
CREATED:20260115T074524Z
LAST-MODIFIED:20260115T143009Z
UID:11865-1768485600-1768491000@fermi.univ-tlse3.fr
SUMMARY:The role of spin fluctuations in quantum materials. - (Caitlin Duffy /  LNCMI / Seminar). - 15/01/2026\, 14H
DESCRIPTION:Seminar LNCMI \nCaitlin Duffy   \nSeminar LNCMI\, 15/01/2026\, 14H\, seminar room and Visio \nSummary\nSpin fluctuations are seen as crucial in a wealth of quantum materials and have been theoretically shown to give rise to non-Fermi liquid behaviour and unconventional superconductivity [1\,2]. However\, their direct observation is a significant challenge\, particularly in high magnetic fields where many correlated systems exhibit unusual behaviour. \nThese fluctuations can be indirectly seen in high fields using techniques such as ultrasound and magnetotransport. Direct observation has recently been made possible using resonant torsion magnetometry (RTM) – a cantilever-based technique that measures spin fluctuations through the anisotropic magnetic susceptibility of a sample. RTM was developed at the NHFML in Los Alamos and has been used to observe transverse magnetic fluctuations preceding the field-induced superconducting phase of UTe2 [3]\, and to provide support in favour of the quantum spin liquid state in RuCl3 [4]. \nIn this seminar I will introduce this novel and powerful technique that I would like to bring the LNCMI. I will discuss how I aim to complement RTM studies with ultrasound and magnetotransport measurements to answer several long-standing questions about the iron pnictides and iron selenides. These two classes of strange metal both host unconventional superconductivity and quantum criticality. However\, the magnetically-ordered phase present in the pnictides\, and theoretically assumed to induce its unconventional behaviour\, is absent in the selenides. \nAdditionally\, I will briefly mention how this technique can be of interest within the wider community of the LNCMI and the EMFL. \n[1] Kontani\, Rep. Prog. Phys. 71\, 026501 (2009)\n[2] Scalapino\, J. Low Temp. Phys. 117\, 179-188 (1999)\n[3] Zambra et al.\, arXiv:2506.08984\n[4] Modic et al.\, Nat. Phys. 17\, pages 240–244 (2021) \nZoom: https://univ-grenoble-alpes-fr.zoom.us/j/94228207316?pwd=khTdznxeFy1ZUYkYftQ0QSox6Fz3iK.1
URL:https://fermi.univ-tlse3.fr/event/the-role-of-spin-fluctuations-in-quantum-materials-caitlin-duffy-lncmi-seminar-15-01-2026-14h/
LOCATION:Salle de seminaire du LNCMI\, Champs Magnétiques Pulsés\, 143 avenue de Rangueil\, Toulouse\, France
CATEGORIES:Events,LNCMI,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260122T140000
DTEND;TZID=Europe/Paris:20260122T153000
DTSTAMP:20260413T010227
CREATED:20260122T141518Z
LAST-MODIFIED:20260122T143104Z
UID:11869-1769090400-1769095800@fermi.univ-tlse3.fr
SUMMARY:Probing the Strange Metal phase of a cuprate with nuclear magnetic resonance. - (Benjamin Costarella /  LNCMI / Seminar). - 22/01/2026\, 14H
DESCRIPTION:Seminar LNCMI \nBenjamin Costarella \, 1st year PhD student of Marc-Henri Julien \nSeminar LNCMI\, 22/01/2026\, 14H\, Visio \nAbstract\nCuprates (high-temperature superconductors) host in their phase diagram a so-called strange metal regime at doping levels beyond the pseudogap phase.\nIn this regime\, the electrical resistivity is linear in temperature down to the lowest temperatures\, in contrast with the quadratic dependence in conventional metals. [1] \nThe spin fluctuations in the strange metal regime have been sparsely investigated\, and the two nuclear magnetic resonance (NMR) studies in the litterature [2\,3] are partly contradictory\, hindering a coherent picture of the strange metal phase. \nHere\, we probe the low-energy spin fluctuations in the cuprate La1.75Sr0.25CuO4 using NMR and high magnetic fields to suppress superconductivity. Our results uncover a divergent dynamical spin susceptibility at low frequency χ′′ (Q\,ω→0) not captured in earlier studies\, pointing to a possible connection between low-energy spin dynamics and the strange metal phenomenology. » \n[1] Cooper et al. Science\, 323\, 5914. pp. 603-607 (2009)\n[2] Ohsugi et al. JPSJ\, 63\, 2\, pp. 700-715 (1993)\n[3] Itoh et al. JPSJ\, 67\, 9\, pp. 3018-3020 (1998) \nLien Zoom : https://univ-grenoble-alpes-fr.zoom.us/j/94228207316?pwd=khTdznxeFy1ZUYkYftQ0QSox6Fz3iK.1
URL:https://fermi.univ-tlse3.fr/event/probing-the-strange-metal-phase-of-a-cuprate-with-nuclear-magnetic-resonance-benjamin-costarella-lncmi-seminar-22-01-2026-14h/
LOCATION:Visio
CATEGORIES:Events,LNCMI,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260123T140000
DTEND;TZID=Europe/Paris:20260123T153000
DTSTAMP:20260413T010227
CREATED:20260122T140003Z
LAST-MODIFIED:20260122T143218Z
UID:11876-1769176800-1769182200@fermi.univ-tlse3.fr
SUMMARY:High-Precision Spectroscopy Applied to the Study of Nuclear Structure of Exotic Nuclei. - (Pierre Lassègues /  LNCMI / Seminar). - 23/01/2026\, 14H
DESCRIPTION:Seminar LNCMI \nPierre Lassègues   \nSeminar LNCMI\, 23/01/2026\, 14H\, seminar room and Visio \nZoom : https://univ-grenoble-alpes-fr.zoom.us/j/92909698065?pwd=clRQvuewPayHBFZjaglEKZagCbe1hj.1
URL:https://fermi.univ-tlse3.fr/event/high-precision-spectroscopy-applied-to-the-study-of-nuclear-structure-of-exotic-nuclei-pierre-lassegues-lncmi-seminar-15-01-2026-14h/
LOCATION:Salle de seminaire du LNCMI\, Champs Magnétiques Pulsés\, 143 avenue de Rangueil\, Toulouse\, France
CATEGORIES:Events,LNCMI,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260129T140000
DTEND;TZID=Europe/Paris:20260129T150000
DTSTAMP:20260413T010227
CREATED:20260124T094220Z
LAST-MODIFIED:20260126T094328Z
UID:11880-1769695200-1769698800@fermi.univ-tlse3.fr
SUMMARY:Magnetic field sorting of superconducting graphite particles with Tc > 400K. - (Manuel Nunez-Regueiro /  LNCMI / Seminar). - 29/01/2026\, 14H
DESCRIPTION:Seminar LNCMI \nManuel Nunez-Regueiro \, Institut Néel \nSeminar LNCMI\, 29/01/2026\, 14H\, Visio \nAbstract\nIt has been claimed that graphite hosts superconductivity at room temperature\, although all efforts to isolate it have been vain.  Here we report separation methods that use magnetic field gradients to sort the superconducting from  normal grains out of industrial graphite powders. We have obtained a concentrate of above room temperature superconducting particles. Electrical resistance measurements on agglomerates of sorted grains of synthetic\, natural and spectroscopically pure graphite all show transition temperatures up Tc\,onset ∼700 K with  zero resistance up to ∼500 K. Magnetization measurements confirm these values through jumps  at Tc in the zero field cooled curves\, and by the occurrence of diamagnetic hysteretic cycles  shrinking with temperature. Transmission electron microscope images yield a hint of the novel structure of these grains. \nLieu : Salle Pauthenet in Grenoble \nLien Zoom : https://univ-grenoble-alpes-fr.zoom.us/j/94228207316?pwd=khTdznxeFy1ZUYkYftQ0QSox6Fz3iK.1
URL:https://fermi.univ-tlse3.fr/event/magnetic-field-sorting-of-superconducting-graphite-particles-with-tc-400k-manuel-nunez-regueiro-lncmi-seminar-29-01-2026-14h/
LOCATION:Visio
CATEGORIES:Events,LNCMI,Seminars
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