BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Kyuil Cho\, The Ames Laboratory and Iowa State University\n\nTh e quantum critical point (QCP)\, where the transitions occur at absolute z ero temperature\, usually induces a new phase\, such as unconventional sup erconductivity in organic\, cuprate\, heavy fermion and Fe-based supercond uctors. Whether the quantum critical point still exists beneath the superc onducting phase is a long-standing question\, but very tricky task since m ost of physical and magnetic properties are useless inside of superconduct ing phase. Here we have measured the zero-temperature penetration depth in BaFe2(As1-x\,Px)2 by using tu nnel diode resonator technique and identified the existence of the QCP ben eath the superconducting dome [1]. In addition\, the low-temperature analy sis of the penetration depth measurements revealed that the superconductin g gap structure shows a universal dome-like evolution as the dopant concen tration increases. The details of experimental and theoretical considerati on will be discussed.\n
\n[1] K. Hashimoto\, Kyuil Cho\, et al.\, Scien ce 336\, 1554 (2012).\n DTSTART:20121018T193000Z LOCATION:Physics Building\, Room 204 SUMMARY:Quantum criticality and superconducting gap evolution in Fe-based s uperconductors END:VEVENT END:VCALENDAR