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Quantum criticality in AFe2As2 with A = K, Rb, and Cs suppresses superconductivity
Felix Eilers, Kai Grube, Diego A. Zocco +10
Superconductors close to quantum phase transitions often exhibit a simultaneous increase of electronic correlations and superconducting transition temperatures. Typical examples ar…
Fermi surface reconstruction in FeSe under high pressure
Taichi Terashima, Naoki Kikugawa, Andhika Kiswandhi +13
We report Shubnikov-de Haas (SdH) oscillation measurements on FeSe under high pressure up to = 16.1 kbar. We find a sudden change in SdH oscillations at the onset of the pressu…
Two-band superconductivity of bulk and surface states in Ag thin films on Nb
Tihomir Tomanic, Michael Schackert, Wulf Wulfhekel +2
We use epitaxial strain to shift the energy of the two-dimensional Ag(111) surface states of Ag islands on Nb(110) substrates, allowing to spatially tune the bottom of the surface-…
Evidence for time-reversal symmetry breaking of the superconducting state near twin-boundary interfaces in FeSe
T. Watashige, Y. Tsutsumi, T. Hanaguri +9
Junctions and interfaces consisting of unconventional superconductors provide an excellent experimental playground to study exotic phenomena related to the phase of the order param…
Dichotomy between the hole and electrons behavior in the multiband FeSe probed by ultra high magnetic fields
M. D. Watson, T. Yamashita, S. Kasahara +15
Magnetoresistivity \r{ho}xx and Hall resistivity \r{ho}xy in ultra high magnetic fields up to 88T are measured down to 0.15K to clarify the multiband electronic structure in high-q…
Pressure-induced antiferromagnetic transition and phase diagram in FeSe
Taichi Terashima, Naoki Kikugawa, Shigeru Kasahara +9
We report measurements of resistance and ac magnetic susceptibility on FeSe single crystals under high pressure up to 27.2 kbar. The structural phase transition is quickly suppress…