BEGIN:VCALENDAR
VERSION:2.0
PRODID:www.dresden-science-calendar.de
METHOD:PUBLISH
CALSCALE:GREGORIAN
X-MICROSOFT-CALSCALE:GREGORIAN
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VTIMEZONE
TZID:Europe/Berlin
X-LIC-LOCATION:Europe/Berlin
BEGIN:DAYLIGHT
TZNAME:CEST
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
DTSTART:19810329T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
DTSTART:19961027T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:DSC-18231
DTSTART;TZID=Europe/Berlin:20211102T145000
SEQUENCE:1635808220
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20211102T162000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/18231
LOCATION:TUD\,    
SUMMARY:Kriener: Valence-Skipping Indium and Its Role in the New Supercondu
 ctor (Ge\,In)Te
CLASS:PUBLIC
DESCRIPTION:Speaker: Markus Kriener\nInstitute of Speaker: RIKEN Center for
  Emergent Matter Science\, Wako\, Japan\nTopics:\nPhysik\n Location:\n  Na
 me: TUD ()\n  Street:   \n  City:  \n  Phone: \n  Fax: \nDescription: <![C
 DATA[<p><strong>Abstract:</strong></p>  <p>A major target in the field of 
 superconductivity is to identify and understand the mechanisms which contr
 ol and increase the superconducting transition temperature Tc. About 30 ye
 ars ago\, Varma pointed out the possibility of enhanced superconducting in
 teractions in systems containing valence-skipping elements due to charge f
 luctuations [1]. One example is In: It skips its 2+ state and usually appe
 ars as In1+ or In3+. In GeTe\, it replaces divalent Ge giving rise to such
  a valence instability. GeTe itself is a well-known multifunctional system
  (cf.\, e.g.\, [2] and References therein). In spite of its semiconducting
  nature\, it exhibits metallic resistivity and superconducts below critica
 l temperature Tc < 350 mK due to Ge vacancies [3]. When doping In\, the su
 perconductivity is quickly suppressed. Upon further increasing the In cont
 ent\, Ge1–xInxTe exhibits a critical doping concentration xc = 0.12 wher
 e various properties change concurrently\, among them the crystal structur
 e\, the nature of the charge carriers\, and a several orders-of-magnitude 
 enhancement and subsequent suppression of the resistivity [4]. Most import
 antly\, a new superconducting phase with monotonically increasing Tc emerg
 es for x > xc. Simultaneously\, a crossover of the In valence state from 3
 + to 1+ is observed. This subtle correlation strongly suggests that the su
 perconducting phase in Ge1–xInxTe is a direct consequence of the valence
  instability of the In dopant. In this talk\, we will present a comprehens
 ive discussion of the characteristic features of this solid solution and d
 iscuss a model which accounts satisfactorily for all observations.</p>  <p
 >[1] C. Varma\, Phys. Rev. Lett. 61\, 2713 (1988).</p>  <p>[2]  M. Kri
 ener\, T. Nakajima\, Y. Kaneko\, A. Kikkawa\, X. Z. Yu\, N. Endo\, K. Kato
 \, M. Takata\, T. Arima\, Y. Tokura and Y. Taguchi\, Sci. Rep. 6\, 25748 (
 2016).</p>  <p>[3] R. Hein et al.\, Phys. Rev. Lett. 12\, 320 (1964).</p> 
  <p>[4]  M. Kriener\, M. Sakano\, M. Kamitani\, M. S. Bahramy\, R. Yuk
 awa\, K. Horiba\, H. Kumigashira\, K. Ishizaka\, Y. Tokura\, and Y. Taguch
 i\, Phys. Rev. Lett. 124\, 047002 (2020)</p>  <p><strong>BigBlueButton:</s
 trong></p>  <p>https://selfservice.zih.tu-dresden.de/l/link.php?m=152285&a
 mp\;p=2aac1766 (https://selfservice.zih.tu-dresden.de/l/link.php?m=152285&
 amp\;p=2aac1766) (TUD)</p>  <p>https://selfservice.zih.tu-dresden.de/link.
 php?m=152285&amp\;p=bd089d88 (https://selfservice.zih.tu-dresden.de/link.p
 hp?m=152285&amp\;p=bd089d88) (external)</p>
DTSTAMP:20260510T015217Z
CREATED:20211022T220651Z
LAST-MODIFIED:20211101T231020Z
END:VEVENT
END:VCALENDAR