BEGIN:VCALENDAR
VERSION:2.0
METHOD:PUBLISH
CALSCALE:GREGORIAN
PRODID:-//WordPress - MECv6.4.2//EN
X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
X-WR-CALDESC:
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-PUBLISHED-TTL:PT1H
X-MS-OLK-FORCEINSPECTOROPEN:TRUE
BEGIN:VEVENT
CLASS:PUBLIC
DTSTART;TZID=Europe/Paris:20230209T110000
DTEND;TZID=Europe/Paris:20230209T120000
DTSTAMP:20230128T145200
UID:MEC-30cde89544caa549a813d660c4b27967@lps.u-psud.fr
CREATED:20230128
LAST-MODIFIED:20230128
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:J.RUHMAN: Unconventional superconductivity in 4Hb-TaS2
DESCRIPTION:\n	4Hb-TaS2 is a transition-metal dichalcogenide (TMD) comprising an alternate stack of two two-dimensional polymorphs, T and H, which are intriguing materials in their own right. The T-structure is the only TMD with one valence electron per unit cell that does not have a metallic ground state. The precise nature of its ground state is not known, but it is well established that it is some kind of non-magnetic Mott insulator on a triangular super lattice.  On the other hand, the H-structure is a metal that becomes superconducting below 0.7K.\n\nWhen these two elements are put together in the 4Hb structure, they form a superconductor that differs significantly from the superconducting state in the H-polymorph. First, it has an elevated Tc ~ 2.6K. Second, it exhibits a number of unusual phenomena, including linear-in-T specific heat, enhancement of the muon-relaxation rate below Tc, anisotropic in plane critical field, π-shift in the Little-Parks oscillations and a mysterious magnetic memory that exists in some temperature range above Tc.\n\nI will describe these various experimental results and how we can understand some of them in theory. I will also spend some time discussing 1T-TaS2, which seems to be crucial to the unconventional superconductivity in this system. \n\n
URL:https://www.lps.u-psud.fr/en/events/j-ruhman-unconventional-superconductivity-in-4hb-tas2/
CATEGORIES:Condensed Matter Theory Seminar
END:VEVENT
END:VCALENDAR