BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-8166
DTSTART:20230216T160000Z
DTEND:20230217T000000Z
DTSTAMP:20260414T054020Z
LAST-MODIFIED:20230127T194728Z
LOCATION:5310 Chamberlin
SUMMARY:Strange Metal Behavior in the Hall Coefficient of BaFe2(As\,P)
 2\, R. G. Herb Condensed Matter Seminar\, Ian Hayes\, University of Ma
 ryland
DESCRIPTION:Even after decades of research on the high-Tc cuprates\, s
 everal parts of their phase diagrams remain mysterious\, especially th
 e normal state above Tc near optimal doping\, a region commonly referr
 ed to as the strange metal phase. New avenues for studying this physic
 s were opened up by the discovery of the iron-based high-Tc materials\
 , which also exhibit strange metal characteristics\, particularly a T-
 linear resistivity and a roughly 1/T Hall coefficient near optimal dop
 ing. In this talk I will present measurements of the Hall coefficient 
 in phosphorous-doped BaFe2As2 in fields of up to 65 tesla\, which is e
 nough to suppress superconductivity even at optimal doping. These meas
 urements reveal a striking parallel between the effects of increasing 
 magnetic field and the effects of increasing temperature\, a phenomeno
 n that is reminiscent of the field-temperature scaling seen in the res
 istivity of this compound. This characteristic field dependence allows
  us to clearly identify the extent of strange metal physics in the ent
 ire phosphorous-doping phase diagram. Intriguingly\, the presence of s
 trange metal behavior in the Hall coefficient is directly related to t
 he presence of the superconductivity across the phase diagram. I will 
 discuss the implications of these observations for different approache
 s to the strange metal as well as the opportunities they present for f
 uture research.
URL:https://www.physics.wisc.edu/events/?id=8166
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