Publisher’s Note: Dichotomy between the Hole and Electron Behavior in Multiband Superconductor FeSe Probed by Ultrahigh Magnetic Fields [Phys. Rev. Lett.<b>115</b>, 027006 (2015)]

Watson, M. D.; Yamashita, T.; Kasahara, S.; Knafo, William; Nardone, Marc; Béard, J.; Hardy, F.; McCollam, A.; Narayanan, A.; Blake, S. F.; Wolf, Th.; Haghighirad, Amir-Abbas; Meingast, C.; Schofield, A. J.; Löhneysen, H. v.; Matsuda, Yasuhiro; Coldea, A. I.; Shibauchi, T.

doi:10.1103/physrevlett.115.219902

Cited by 30 publications

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“…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]. The present estimated density at P = 0 kbar increases with decreasing temperature below 30 K. This may be regarded as asymptotic behavior toward the true density because the scattering rate becomes less anisotropic as T → 0.…”

Section: Fig 2 (Color Online)mentioning

confidence: 65%

“…The MR is enhanced not suddenly at T s but gradually with decreasing temperature. In previous reports [40,50], the nonlinear ρ H (B) has been ascribed to the existence of a third carrier with a high mobility and has been explained with a compensated three-carrier model [40]. The model consists of one hole (h) and two electron carriers (e1 and e2), and one of the two electron carriers (e2) has a larger mobility [45].…”

Section: Fig 2 (Color Online)mentioning

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%

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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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Section: Fig 2 (Color Online)mentioning

confidence: 65%

Section: Fig 2 (Color Online)mentioning

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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“…As a candidate of such factors, it will be in-teresting to theoretically incorporate the argument 16,19 that FeSe is possibly in the so-called BCS-BEC-crossover regime. We also suggest other possibilities such that the interband asymmetry neglected in our model may be important or that an additional small electron pocket 38,39 may contribute to SCFs.…”

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confidence: 87%

Fluctuation diamagnetism in two-band superconductors

Adachi

Ikeda

2016

Phys. Rev. B

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Anomalously large fluctuation diamagnetism around the superconducting critical temperature has been recently observed on iron selenide (FeSe) [S. Kasahara et al., unpublished]. This indicates that superconducting fluctuations (SCFs) play a more significant role in FeSe, which supposedly has twoband structure, than in the familiar single-band superconductors. Motivated by the data in FeSe, SCF-induced diamagnetism is examined in a two-band system, on the basis of a phenomenological approach with a Ginzburg-Landau functional. The obtained results indicate that the SCF-induced diamagnetism may be more enhanced than that in a single-band system due to the existence of two distinct fluctuation modes. Such enhancement of diamagnetism unique to a two-band system seems consistent with the large diamagnetism observed on FeSe, though still far from a quantitative agreement.

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“…[1][2][3] In the last decade, following their first observation in cuprate high-temperature superconductors, [4] they have been extensively used to investigate the electronic structure of cuprates, both hole- [5] and electrondoped, [6] as well as in Fe-based superconductors. [7][8][9][10][11][12][13] Probably most surprising are the data for the underdoped yttrium barium copper oxide (YBCO) compounds YBa 2 Cu 3 O 6+δ ( [4,[14][15][16][17][18][19][20][21] reviewed in [5,[22][23][24]). The Fourier transform of these quantum oscillations has a prominent peak at frequency F α ≈ 530T with two smaller shoulders at F ± = F α ± ∆F α , where ∆F α ≈ 90T .…”

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confidence: 99%

Slow quantum oscillations without fine-grained Fermi surface reconstruction in cuprate superconductors

Grigoriev

Ziman

2017

Jetp Lett.

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The Fourier transform of the observed magnetic quantum oscillations (MQO) in YBa2Cu3O 6+δ high-temperature superconductors has a prominent low-frequency peak with two smaller neighbouring peaks. The separation and positions of these three peaks are almost independent of doping. This pattern has been explained previously by rather special, exquisitely detailed, Fermi-surface reconstruction. We propose that these MQO have a different origin, and their frequencies are related to the bilayer and inter-bilayer electron hopping rather than directly to the areas of tiny Fermi-surface pockets. Such so-called "slow oscillations" explain more naturally many features of the observed oscillations and allow us to estimate the inter-layer transfer integrals and in-plane Fermi momentum.Magnetic quantum oscillations (MQO) provide a traditional and powerful tool to study the Fermi surface and other electronic structure parameters of various metals. [1][2][3] ([4, 14-21] reviewed in [5,[22][23][24]). The Fourier transform of these quantum oscillations has a prominent peak at frequency F α ≈ 530T with two smaller shoulders at F ± = F α ± ∆F α , where ∆F α ≈ 90T . All these frequencies are much smaller than expected from closed pockets of the Fermi surface(FS). Many different theoretical models have been proposed to explain such a set of frequencies ([25-29], reviewed in [5,22,23]). While these interpretations vary in detail, such as inclusion of spin-orbit or Zeeman splittings, they are all based on Fermi-surface reconstruction due to the periodic potential created by a charge density wave (CDW). A weak, probably, inhomogeneous or fluctuating CDW order has been detected in YBa 2 Cu 3 O 6+δ compounds by X-Ray scattering [30][31][32][33], nuclear magnetic resonance [34,35], and sound velocity measurements [36]. High magnetic fields suppress superconductivity and lead to long-range CDW coherence.[33] Static CDW order can indeed lead to Fermi surface reconstruction, seen in new MQO frequencies, but only if the CDW potential is sufficiently strong. More precisely, the CDW energy gap must be larger than the magnetic-breakdown gapwhere ω c is the cyclotron energy, i.e. the separation between the Landau levels, and E F ∼ 1eV is the Fermi energy of the unreconstructed electron dispersion. The oscillations in cuprates are measured in magnetic fields B higher than 30 tesla, where ∆ MB 40meV is rather large and a fluctuating CDW ordering may not be enough to form new frequencies with amplitudes sufficient for experimental observation. Note that a frequency pattern somewhat similar to that of YBa 2 Cu 3 O 6+δ is observed in the closely related stoichiometric compound YBa 2 Cu 4 O 8 , [37][38][39] where there is no experimental indication of a static superstructure. Even if this CDW is sufficiently strong, it is hard to explain the observed three-peak frequency pattern of MQO in YBCO without additional frequencies of similar amplitude from the CDW wave vector seen in X-ray experiments. [30][31][32][33] Moreover, if FS reconstruction really i...

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Publisher’s Note: Dichotomy between the Hole and Electron Behavior in Multiband Superconductor FeSe Probed by Ultrahigh Magnetic Fields [Phys. Rev. Lett.115, 027006 (2015)]

Cited by 30 publications

References 0 publications

Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe

Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe

Fluctuation diamagnetism in two-band superconductors

Slow quantum oscillations without fine-grained Fermi surface reconstruction in cuprate superconductors

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