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 dx2−y2 +/- 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)
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09:30 | TT 51.1 | Hauptvortrag: Evaluation of chiral superconductivity in Sr2RuO4 — •Clifford Hicks |
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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 |
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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. | ||
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11:15 | TT 51.4 | Hauptvortrag: Time-reversal symmetry breaking in Fe-based superconductors — •Andrey Chubukov |
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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 |
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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 |
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12:30 | TT 51.7 | Unconventional pairing states based on first-principles — •Balazs Ujfalussy, Gabor Csire, and James Annett |
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12:45 | TT 51.8 | Anomalous Nonlocal Conductance in Superconductor/Ferromagnets Hybrids with Chiral p-wave pairing symmetry — •Satoshi Ikegaya and Dirk Manske |