Quantum oscillations and upper critical magnetic field of the iron-based superconductor FeSe

Audouard, Alain; Duc, F.; Drigo, L.; Toulemonde, Pierre; Karlsson, Sandra; Strobel, Pierre; Sulpice, A.

doi:10.1209/0295-5075/109/27003

Cited by 69 publications

(82 citation statements)

References 46 publications

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“…All frequencies are lower than 1 kT in agreement with previous reports 12,13 . This is smaller than the frequencies of other ironbased superconductors that do not show any Fermi surface reconstruction, such as LaFePO 31 or LiFeAs 32 .…”

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confidence: 93%

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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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confidence: 93%

“…The quantum oscillations frequencies, F (T), and effective masses, m * (me), for our sample S4 and S5 (shown in Fig.3) are compared with those from Refs. 12,13 . .…”

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confidence: 99%

Emergence of the nematic electronic state in FeSe

et al. 2015

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“…One possibility is that it is the nematic response of electrons that are not sharply defined quasiparticles. Such an interpretation would be in line with the observed bad metal behavior (9,13), and the fact that the Fermi energy of FeSe is rather small (9,11,12).…”

Section: Significancesupporting

confidence: 68%

“…Its superconducting transition temperature T c is relatively low at ambient pressure (∼ 9 K), but it reaches up to 37 K upon application of hydrostatic pressure (7,8). Its Fermi energy is small (9)(10)(11)(12), and in the normal state it shows bad metal behavior (9,13). Its nematic properties are peculiar as well.…”

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confidence: 99%

Charge-induced nematicity in FeSe

Massat

Farina

Paul

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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The spontaneous appearance of nematicity, a state of matter that breaks rotation but not translation symmetry, is one of the most intriguing properties of the iron-based superconductors (Fe SC), and has relevance for the cuprates as well. Establishing the critical electronic modes behind nematicity remains a challenge, however, because their associated susceptibilities are not easily accessible by conventional probes. Here, using FeSe as a model system, and symmetry-resolved electronic Raman scattering as a probe, we unravel the presence of critical charge nematic fluctuations near the structural/nematic transition temperature, T S ∼ 90 K. The diverging behavior of the associated nematic susceptibility foretells the presence of a Pomeranchuk instability of the Fermi surface with d-wave symmetry. The excellent scaling between the observed nematic susceptibility and elastic modulus data demonstrates that the structural distortion is driven by this d-wave Pomeranchuk transition. Our results make a strong case for chargeinduced nematicity in FeSe.nematicity | superconductivity | Raman scattering

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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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Quantum oscillations and upper critical magnetic field of the iron-based superconductor FeSe

Cited by 69 publications

References 46 publications

Emergence of the nematic electronic state in FeSe

Emergence of the nematic electronic state in FeSe

Charge-induced nematicity in FeSe

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

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