Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 13: Superconductivity: Fe-based Superconductors - 122
TT 13.8: Vortrag
Montag, 20. März 2017, 17:00–17:15, HSZ 103
Selective quantum criticality in a multi-band system: BaFe2(As1−xPx)2 — •Vadim Grinenko1,2,3, Kazumasa Iida2, Fritz Kurth3, Dmitriy Efremov3, Stefan-Ludwig Drechsler3, Ivan Cherniavskii4, Igor Morozov4, Jens Hänisch5, Tobias Förster6, Chiara Tarantini7, Jan Jaroszynski7, Boris Maiorov8, Marcelo Jaime8, Akiyasu Yamamoto9, Ibuki Nakamura2, Hiroyuki Fujimoto2, Takafumi Hatano2, Hiroshi Ikuta2, and Ruben Hühne3 — 1TU Dresden, Germany — 2Nagoya University, Japan — 3IFW Dresden, Germany — 4Lomonosov Moscow State University, Russian Federation — 5Karlsruhe Institute of Technology, Germany — 6Hochfeld-Magnetlabor Dresden (HLD-EMFL), Germany — 7NHMFL, Florida State University, USA — 8MPA-CMMS, Los Alamos National Laboratory, USA — 9Tokyo University of Agriculture and Technology, Japan
A quantum phase transition was recently reported for BaFe2(As1−xPx)2 at xc ∼ 0.3. For such a transition all thermodynamic and transport properties are believed to scale with a single characteristic energy, given by the quantum fluctuations. Here we reconsider this statement. We report the superconducting upper critical field Hc2 for BaFe2(As1−xPx)2 single crystalline thin films in a wide range of P-doping by measuring the resistivity under high magnetic fields. The temperature and doping dependencies of Hc2 signal that some parts of the Fermi surface exhibit no mass divergence at xc in contrast to the common belief. We anticipate that the observed dual behavior could be found also in other quantum critical multi-band systems.