Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 51: Focus Session: Broken Time Reversal Symmetry in Multiband Superconductors

Donnerstag, 4. April 2019, 09:30–13:00, H2

A broken time-reversal symmetry (BTRS) superconducting state is observed for several unconventional superconductors (SC) such as Sr2RuO4, SrPtAs, and UPt3. This state can be described as a coherent chiral state of degenerate order parameter symmetries such as px +/- i py or dx2y2 +/- dxy which form since they avoid the formation of node lines on the Fermi surface. The main experimental evidence for BTRS SC comes from the observation of a polar Kerr effect and the appearance of small static internal magnetic fields in muon spin relaxations measurements at zero external field below Tc. However, a clear experimental proof for a specific order parameter symmetry is difficult. Recently, a new strategy has been developed to identify these states in Sr2RuO4 by applying uniaxial strain which triggered many new experimental studies in this field. For multi-band iron-based superconductors a new route to chiral sc order parameters based on the frustrated competition of different sc phases has been proposed. This state is now found in the hole-doped B1−xKxFe2As2 system.

Organized by: Hans-Henning Klauss (TU Dresden), Ilya Eremin (RU Bochum), Dimitry V. Efremov (IFW Dresden)

09:30 TT 51.1 Hauptvortrag: Evaluation of chiral superconductivity in Sr2RuO4 — •Clifford Hicks
10:00 TT 51.2 Hauptvortrag: Magnetic excitations and their possible role in the superconducting pairing in Sr2RuO4 — •Markus Braden, Stefan Kunkemöller, Kevin Jenni, Paul Steffens, Yvan Sidis, Zhiqiang Q. Mao, Yoshiteru Maeno, and Igor Mazin
10:30 TT 51.3 Hauptvortrag: Topologically protected Bogoliubov Fermi surfaces — •Daniel Agterberg, Philip Brydon, Henri Menke, and Carsten Timm
  11:00 15 min. break.
11:15 TT 51.4 Hauptvortrag: Time-reversal symmetry breaking in Fe-based superconductors — •Andrey Chubukov
11:45 TT 51.5 Hauptvortrag: Emerging superconductivity with broken time reversal symmetry inside a superconducting s-wave state — •Vadim Grinenko, Rajib Sarkar, Philipp Materne, Kunihiro Kihou, Chul-Ho Lee, Saicharan Aswartham, Igor Morozov, Bernd Buechner, Ruben Huehne, Nielsch Kornelius, Konstantin Nenkov, Dmitriy Efremov, Stefan-Ludwig Drechsler, Paul Chekhonin, Werner Skrotzki, Vasiliy Vadimov, Mihail Silaev, Pavel Volkov, Ilya Eremin, Hubertus Luetkens, and Hans-Henning Klauss
12:15 TT 51.6 Muon spin relaxation studies of Sr2RuO4 under uniaxial stress — •Shreenanda Ghosh, Rajib Sarkar, Vadim Grinenko, Jean-Christophe Orain, Felix Brückner, Artem Nikitin, Joonbum Park, Mark Barber, Dmitry Sokolov, Naoki Kikugawa, Jake Bobowski, Yoshiteru Maeno, Hubertus Luetkens, Andrew Mackenzie, Clifford Hicks, and Hans-Henning Klauss
12:30 TT 51.7 Unconventional pairing states based on first-principles — •Balazs Ujfalussy, Gabor Csire, and James Annett
12:45 TT 51.8 Anomalous Nonlocal Conductance in Superconductor/Ferromagnets Hybrids with Chiral p-wave pairing symmetry — •Satoshi Ikegaya and Dirk Manske
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