Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 51: Focus Session: Broken Time Reversal Symmetry in Multiband Superconductors
TT 51.5: Hauptvortrag
Donnerstag, 4. April 2019, 11:45–12:15, H2
Emerging superconductivity with broken time reversal symmetry inside a superconducting s-wave state — •Vadim Grinenko1,2, Rajib Sarkar1, Philipp Materne1, Kunihiro Kihou3, Chul-Ho Lee3, Saicharan Aswartham2, Igor Morozov2,4, Bernd Buechner2, Ruben Huehne2, Nielsch Kornelius2, Konstantin Nenkov2, Dmitriy Efremov2, Stefan-Ludwig Drechsler2, Paul Chekhonin1, Werner Skrotzki1, Vasiliy Vadimov5, Mihail Silaev6, Pavel Volkov7, Ilya Eremin7, Hubertus Luetkens8, and Hans-Henning Klauss1 — 1TU Dresden, Germany — 2IFW Dresden, Germany — 3AIST, Tsukuba, Japan — 4Lomonosov Moscow State University, Russia — 5Institute for Physics of Microstructures, Russia — 6University of Jyvaskyla, Finland — 7Ruhr-Universitat Bochum, Germany — 8PSI, Switzerland
In general, magnetism and superconductivity are antagonistic to each other. However, there are several families of superconductors, in which superconductivity may coexist with magnetism, and only a few examples are known, when superconductivity itself induces a magnetism. Here, we report the finding of a narrow dome of a novel s+is′ superconducting (SC) phase with broken time-reversal symmetry (BTRS) inside the broad s-wave SC region of the centrosymmetric multiband superconductor Ba1−xKxFe2As2 (0.7 x 0.8). The BTRS dome appears very close to a Lifshitz transition. With this, we experimentally demonstrate the emergence of a novel quantum state at topological changes of the electronic system [1].
Phys. Rev. B 95, 214511 (2017); arXiv: 1809.03610 (2018)