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SUMMARY:CM Seminar: Interplay between metal-to-Insulator-like transition and superconductivity in Ga-doped Re3Ge7 single crystals\, Eundeok Mun\, SFU
DESCRIPTION:Speaker: Eundeok Mun\, SFU \nTime: 10:00-11:00am \nLocation: BRIM 311 \nTitle: Interplay between metal-to-Insulator-like transition and superconductivity in Ga-doped Re3Ge7 single crystals \nAbstract: Growing single crystals of Re3Ge7 allows for detailed investigations into its complex electronic behavior\, revealing it as a material with an emerging unconventional charge ordered state and superconductivity by external pressure and doping. To further explore characteristics\, we have synthesized single crystals of Ga-doped Re3Ge7 and performed magnetization\, electrical resistivity\, specific heat\, and thermoelectric power measurements. In this talk I will share new findings in this system. The obtained x-T phase diagram of Re3(GaxGe1-x)7 exhibits a close relationship between metal-to-insulator-like (MIL) transition and superconducting transition temperature. Interestingly\, superconductivity emerges when the MIL transition becomes a maximum and the maximum superconducting transition temperature can be achieved when the MIL transition is suppressed\, basically forming a superconducting dome. The upper critical field (Hc2) measurements exhibit that Hc2 curves are well described by the Ginzburg-Landau equation in the right side of the superconducting dome. On the other hand\, the Hc2 curve in the left side of the dome deviates from the Ginzburg-Landau model at low temperatures\, where the superconductivity and MIL transition coexists. Furthermore\, samples showing superconductivity indicate a re-entrance of zero-resistance state (peak effect) under external magnetic field\, providing a good opportunity to study complex vortex state.
URL:https://qmi.miffanytark.com/event/cm-seminar-eundeok-mun-sfu/
CATEGORIES:CM Seminar
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