Anomalous Fermi surface in FeSe seen by Shubnikov-de Haas oscillation measurements
Terashima, Taichi · Kikugawa, Naoki · Kiswandhi, Andhika · Choi, Eun-Sang · Brooks, James S. · Kasahara, Shigeru · Watashige, Tatsuya · Ikeda, Hiroaki · Shibauchi, Takasada · Matsuda, Yuji · Wolf, Thomas · Böhmer, Anna E. · Hardy, Frédéric · Meingast, Christoph · Löhneysen, Hilbert v. · Suzuki, Michi-To · Arita, Ryotaro · Uji, Shinya
Original · EN
We have observed Shubnikov-de Haas oscillations in FeSe. The Fermi surface deviates significantly from predictions of band-structure calculations and most likely consists of one electron and one hole thin cylinder. The carrier density is in the order of 0.01 carriers/ Fe, an order-of-magnitude smaller than predicted. Effective Fermi energies as small as 3.6 meV are estimated. These findings call for elaborate theoretical investigations incorporating both electronic correlations and orbital ordering.
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