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X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20260622T143000
DTEND;TZID=Europe/Paris:20260622T180000
DTSTAMP:20260616T082500
UID:MEC-47060dfad0287968d7a4a022691b7f53@lps.u-psud.fr
CREATED:20260616
LAST-MODIFIED:20260616
PRIORITY:5
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SUMMARY:David Le Boeuf : Loss of strange metal behaviour and carrier density at spin freezing transition in a cuprate superconductor
DESCRIPTION:\nStrange metals – which exhibit unusual properties such as a resistivity that scales linearly with temperature – challenge our understanding of charge transport in metals. We investigate how the strange metal phase of the cuprate superconductor La2-xSrxCuO4 is impacted by field-induced antiferromagnetism. We find T-linear resistivity regime at low temperatures over an extended range of magnetic fields where magnetic moments fluctuate, and T-linear resistivity is lost when magnetic fluctuations are quenched with magnetic fields. This suggests that strange metalicity is linked to the existence of magnetic fluctuations persisting at low T and high fields. The high field emergence of static magnetism produces large insulating-like resistivity upturns inside the pseudogap phase. Our Hall effect data show that this increase in resistivity is caused by a loss of carrier density, suggesting a coupling between charge and spins that leads to the concomitent freezing of charge and spin degrees of freedom.\n
URL:https://www.lps.u-psud.fr/en/events/david-le-boeuf-loss-of-strange-metal-behaviour-and-carrier-density-at-spin-freezing-transition-in-a-cuprate-superconductor/
CATEGORIES:Seminar SMQ,Seminars
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