Anomalous Fermi surface in FeSe seen by Shubnikov–de Haas oscillation measurements

Terashima, Taichi; Kikugawa, Naoki; Kiswandhi, Andhika; Choi, Eun Sang; Brooks, J. S.; Kasahara, S.; Watashige, Tatsuya; Ikeda, Hiroaki; Shibauchi, T.; Matsuda, Yuji; Wolf, Thomas; Böhmer, Anna E.; Hardy, F.; Meingast, C.; Löhneysen, H. v.; Suzuki, Michi To; Arita, Ryotaro; Uji, Shinya

doi:10.1103/physrevb.90.144517

Cited by 183 publications

(260 citation statements)

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“…An intuitive explanation for this would be that parts of the FS where scattering is particularly strong, dubbed hot spots, contribute little to the electrical transport and hence they are missed, although a recent theory suggests a more involved explanation [58]. In fact, the actual carrier density at P = 0 kbar as T → 0 is estimated from SdH oscillations [37] to be ∼ 3 × 10 20 cm −3 [59], approximately three times larger than the present estimate at T = 10 K (Fig. 4), as pointed out in [40].…”

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confidence: 99%

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Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe

Terashima¹,

Kikugawa²,

Kasahara³

et al. 2016

Phys. Rev. B

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The resistivity ρ and Hall resistivity ρH are measured on FeSe at pressures up to P = 28.3 kbar in magnetic fields up to B = 14.5 T. The ρ(B) and ρH (B) curves are analyzed with multicarrier models to estimate the carrier density and mobility as a function of P and temperature (T 110 K). It is shown that the pressure-induced antiferromagnetic transition is accompanied by an abrupt reduction of the carrier density and scattering. This indicates that the electronic structure is reconstructed significantly by the antiferromagnetic order.PACS numbers: 74.70. Xa, 72.15.Gd, 74.25.Dw, 74.25.Jb Since the discovery of superconductivity (SC) at T c = 26 K in LaFeAs(O 1−x F x ) by Kamihara et al.[1], the iron-based high-T c materials have intensively been studied. Yet, the paring mechanism is still highly controversial: some propose spin fluctuations as the glue [2, 3], while others orbital ones [4, 5]. Intimately related to this issue is the origin of the nematic transition [6]. Typical iron-pnictide parent compounds such as LaFeAsO or BaFe 2 As 2 [7,8] exhibit a tetragonal-toorthorhombic structural transition at T s , slightly above or at the same temperature as a stripe-type antiferromagnetic (AFM) order at T N . Electronic properties below T s exhibit in-plane anisotropy that is much stronger than expected from the slight orthorhombic distortion [9][10][11][12]. It is therefore believed that the structural transition is driven by electronic (i.e., spin or orbital) degrees of freedom and thus it is called a nematic transition. T s and T N are reduced simultaneously by pressure or chemical substitution, resulting in a phase diagram where the AFM phase is enclosed by the nematic one [9]. This is consistent with scenarios of spin-driven nematicity [6,13]. An SC dome appears around points where T s and T N reach zero.) initially attracted attention because of a remarkable enhancement of T c by pressure [15][16][17][18]. A report of T c > 50 K in single-layer films [19] has also aroused considerable interest. At the same time, FeSe may be crucial in determining the paring glue and the origin of the nematicity in the iron-based superconductors. It undergoes a structural transition at T s ∼ 90 K but does not order magnetically at ambient pressure [20]. A large splitting of the d xz and d yz bands below ∼ T s found by angle-resolved photoemission spectroscopy indicates that the transition at T s is a nematic one accompanied by orbital polarization [21][22][23]. An AFM transition can be induced by pressure [24][25][26]. However, the phase diagram (see Fig. 1 and [26][27][28]) is distinct from the typical one described above for the iron-pnictide compounds. This casts some doubts on the spin-nematic scenarios. It is however to be noted that low-energy AFM spin fluctuations have been observed below T s in NMR and inelastic neutron scattering measurements [29][30][31][32][33][34]. In addition, very recent reports suggest that at high pressures (P 18 kbar, Fig. 1) where no separate structural transition at T s is seen the AFM tr...

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confidence: 99%

“…So far Shubnikovde Haas (SdH) measurements have been performed at ambient pressure [37][38][39][40] and under high pressure [41]. The Fermi surface (FS) at ambient pressure is anomalous, deviating significantly from that predicted by bandstructure calculations [37].…”

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confidence: 99%

Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe

Terashima¹,

Kikugawa²,

Kasahara³

et al. 2016

Phys. Rev. B

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“…[7][8][9][10] In this respect, as the structurally simplest Fe-based superconductor, FeSe has unexpectedly emerged in the frontier of Fe-based superconductivity research. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Up to date, few consensuses have been reached on either the electronic structure of FeSe or its nematic and superconducting mechanisms. For example, very recent angle-resolved photoemission spectroscopy (ARPES) has indicated a small Fermi surface (FS) above T s that cannot be reproduced by density functional theory calculations.…”

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confidence: 99%

Unveiling the hidden nematicity and spin subsystem in FeSe

et al. 2017

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The nematic order (nematicity) is considered as one of the essential ingredients to understand the mechanism of Fe-based superconductivity. In most Fe-based superconductors (pnictides), nematic order is reasonably close to the antiferromagnetic order. In FeSe, in contrast, a nematic order emerges below the structure phase transition at T s = 90 K with no magnetic order. The case of FeSe is of paramount importance to a universal picture of Fe-based superconductors. The polarized ultrafast spectroscopy provides a tool to probe simultaneously the electronic structure and the magnetic interactions through quasiparticle dynamics. Here we show that this approach reveals both the electronic and magnetic nematicity below and, surprisingly, its fluctuations far above T s to at least 200 K. The quantitative pump-probe data clearly identify a correlation between the topology of the Fermi surface and the magnetism in all temperature regimes, thus providing profound insight into the driving factors of nematicity in FeSe and the origin of its uniqueness.

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“…ARPES has found evidence of a large band splitting caused by orbital ordering below the structural transition 10,11 but the resolution of the available data cannot clarify the changes that occur at the Fermi level. Moreover, quantum oscillation experiments at low temperatures have detected an unusually small Fermi surface 12,13 . As magnetic fluctuations are detected only below the structural transition in FeSe, it is expected that they are not the driving force for this transition 14,15 .…”

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Emergence of the nematic electronic state in FeSe

et al. 2015

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We present a comprehensive study of the evolution of the nematic electronic structure of FeSe using high resolution angle-resolved photoemission spectroscopy (ARPES), quantum oscillations in the normal state and elastoresistance measurements. Our high resolution ARPES allows us to track the Fermi surface deformation from four-fold to two-fold symmetry across the structural transition at ~87 K which is stabilized as a result of the dramatic splitting of bands associated with dxz and dyz character. The low temperature Fermi surface is that a compensated metal consisting of one hole and two electron bands and is fully determined by combining the knowledge from ARPES and quantum oscillations. A manifestation of the nematic state is the significant increase in the nematic susceptibility as approaching the structural transition that we detect from our elastoresistance measurements on FeSe. The dramatic changes in electronic structure cannot be explained by the small lattice effects and, in the absence of magnetic fluctuations above the structural transition, points clearly towards an electronically driven transition in FeSe stabilized by orbital-charge ordering.Comment: Latex, 8 pages, 4 figure

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Anomalous Fermi surface in FeSe seen by Shubnikov–de Haas oscillation measurements

Cited by 183 publications

References 44 publications

Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe

Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe

Unveiling the hidden nematicity and spin subsystem in FeSe

Emergence of the nematic electronic state in FeSe

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