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Fermi surface reconstruction in FeSe under high pressure

TitleFermi surface reconstruction in FeSe under high pressure
Publication TypeJournal Article
Year of Publication2016
AuthorsTerashima, T, Kikugawa, N, Kiswandhi, A, Graf, D, Choi, ES, Brooks, JS, Kasahara, S, Watashige, T, Matsuda, Y, Shibauchi, T, Wolf, T, Bohmer, AE, Hardy, F, Meingast, C, Lohneysen, HV, Uji, S
JournalPhysical Review B
Date Published03
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000371401700003
Keywordsmagnetic-field, nematicity, phase, superconductivity

We report Shubnikov-de Haas (SdH) oscillation measurements on FeSe under high pressure up to P = 16.1 kbar. We find a sudden change in SdH oscillations at the onset of the pressure-induced antiferromagnetism at P similar to 8 kbar. We argue that this change can be attributed to a reconstruction of the Fermi surface by the antiferromagnetic order. The negative dT(c)/dP observed in a range between P similar to 8 and 12 kbar may be explained by the reduction in the density of states due to the reconstruction. The ratio of the transition temperature to the effective Fermi energy remains high under high pressure: k(B)T(c)/E-F similar to 0.1 even at P = 16.1 kbar.

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