Naslov
Anomalous normal and superconducting states in the nematic FeSe1-xSx

Autori
Čulo, Matija ; Licciardello, Salvatore ; Ayres, Jake ; Buhot, Jonathan ; Shibauchi, Takasada ; Kasahara, Shigeru ; Matsuda, Yuji ; Hussey, Nigel

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
SuperFluctuations 2022 – Book of Abstracts / Dell'Anna, Luca ; Salasnich, Luca ; Perali, Andrea ; Uemura, Yasutomo - Padova, 2022

Skup
SuperFluctuations 2022

Mjesto i datum
Padova, Italija; online, 06.07.2022. - 08.07.2022

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
FeSe1-xSx ; unconventional superconductivity ; electronic nematicity ; quantum critical point ; linear-temperature resistivity ; quadrature scaling ; anomalous Hall response ; high-field magnetoresistance ; quantum vortex liquid ; quantum fluctuations ; Bose-Einstein condensation ; Fulde-Ferrel-Larkin-Ovchinnikov state

Sažetak
FeSe1-xSx is unique among unconventional superconductors because of superconductivity that emerges from a pure electronic nematic state. Substituting Se for S leads to a progressive suppression of the nematic transition which is believed to terminate as a quantum critical point (QCP) at x ≈ 0.17. Highly unusual transport properties have been detected in the normal (non- SC) state in high magnetic fields (H) down to low temperatures (T): i) T-linear resistivity within a fan-like region centered at the QCP, ii) quadrature scaling with H-linear magnetoresistance at high H that peaks close to the QCP and iii) non-monotonous Hall response that also peaks close to the QCP. Here we focus on the SC state of FeSe 1-xSx, especially on the mixed (vortex) regime and follow its evolution with T, H and x. Our high- field magnetoresistance measurements reveal an unusually broad field range with finite resistivity in the SC state that persists down to extremely low T across the nematic QCP. Such behavior points towards the melting of the vortex lattice even in the zero-temperature limit, i.e. the emergence of a roboust quantum vortex liquid (QVL) regime, which is ascribed to intense quantum fluctuations, of both nematic and magnetic origin. Further expansion of the QVL beyond the QCP is associated with a reduction in pinning strength along with a possible approach towards Bose- Einstein condensation. Additional thermal conductivity measurements on pure FeSe provide compelling evidence for the stabilization of the Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state at high H.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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