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BEGIN:VEVENT
DTSTAMP:20260627T152119Z
DTSTART;VALUE=DATE-TIME:20150127T130000
DTEND;VALUE=DATE-TIME:20150127T140000
SUMMARY:CMP Seminar - Tony Carrington (Bristol)
TZID:Europe/London
UID:20150127-094d43454aca4325014b0cc2131141be@warwick.ac.uk
CREATED:20150121T135020Z
DESCRIPTION:Quantum criticality and gap structure in iron-pnictide superc
 onductors Antony Carrington HH Wills Physics laboratory\, University of 
 Bristol Iron pnictide/chalcogenide superconductors present a so-far uniq
 ue new perspective on the field of unconventional superconductivity. The
  materials have a relatively high superconducting transition temperature
  and in contrast to the cuprates\, multi-band\, mult-orbital physics pla
 ys a key role but Mott physics less so. One unique property is that the 
 structure of the superconducting gap function has an unprecedented varia
 tion between the different compounds. In some cases\, there is a clearly
  identifiable quantum critical point in the temperature – doping phase d
 iagram and this presents an excellent opportunity to study how quantum c
 ritical fluctuations affect (or perhaps cause) the superconducting state
 . In this talk I will review experiments identifying the superconducting
  gap structure and quantum critical point (QCP) in the iron-pnictide sup
 erconductor series BaFe2(As1-xPx)2. Specific heat and magnetic penetrati
 on depth measurements are used to identify the structure of the supercon
 ducting energy gap which has been suggested to be a key test of whether 
 the pairing is due to magnetic or orbital order fluctuations. de Haas-va
 n Alphen\, magnetic penetration depth and heat capacity results all show
  clear signatures of a diverging mass at its QCP. The proximity of the Q
 CP yields unexpected anomalies in the superconducting critical fields. W
 e find that both the lower and upper critical fields strongly violate th
 e expectations from conventional theory taking into account the observed
  mass enhancement near the QCP. This implies that the energy of supercon
 ducting vortices is enhanced suggesting that a highly unusual vortex sta
 te is realised in quantum critical superconductors.
LOCATION:P5.23
CATEGORIES:Condensed Matter Physics Seminar
LAST-MODIFIED:20150121T135020Z
ORGANIZER;CN=Jon Duffy:
END:VEVENT
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