Electronic structure near the 1/8-anomaly in La-based cuprates

Chang, J.; Sassa, Yasmine; Guerrero, Sebastian; Må̊nsson, Martin; Shi, M.; Pailhés, S.; Bendounan, A.; Mottl, Rafael; Claesson, Thomas; Tjernberg, Oscar; Patthey, L.; Ido, M.; Oda, Masahiro; Momono, N.; Mudry, Christopher; Mesot, J.

doi:10.1088/1367-2630/10/10/103016

Cited by 66 publications

(74 citation statements)

References 40 publications

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“…4i). This is distinct from that reported in Nd−LSCO system [23] which is symmetrical with respect to the (π,0)−(0,π) line, similar to the "shadow band" commonly observed in Bi2201 and Bi2212 [18]. This particular location makes it impossible to originate from the d-density-wave "hidden order" that gives a holelike Fermi pocket centered around (π/2,π/2) point [24,25].…”

contrasting

confidence: 75%

Coexistence of Fermi arcs and Fermi pockets in a high-Tc copper oxide superconductor

Meng

Liu

Zhang

et al. 2009

Nature

217

198

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1In the pseudogap state of the high−T c copper-oxide (cuprate) superconductors [1], angle-resolved photoemission (ARPES) measurements have seen an Fermi arc, i.e., an open-ended gapless section in the large Fermi surface [2,3,4,5,6,7,8], rather than a closed loop expected of an ordinary metal. This is all the more puzzling because Fermi pockets (small closed Fermi surface features) have been suggested from recent quantum oscillation measurements [9,10,11,12,13,14]. The Fermi arcs have worried the high−T c community for many years because they cannot be understood in terms of existing theories. Theorists came up with a way out in the form of conventional Fermi surface pockets associated with competing order, with a back side that is for detailed reasons invisible by photoemission [15]. Here we report ARPES measurements of La-Bi2201 that give direct evidence of the Fermi pocket.The charge carriers in the pocket are holes and the pockets show an unusual dependence upon doping, namely, they exist in underdoped but not overdoped samples. A big surprise is that these Fermi pockets appear to coexist with the Fermi arcs. This coexistence has not been expected theoretically and the understanding of the mysterious pseudogap state in the high-T c cuprate superconductors will rely critically on understanding such a new finding.The high resolution Fermi surface mapping (Fig. 1a) on the underdoped La-Bi2201 UD18K sample using VUV laser reveals three Fermi surface sheets with low spectral weight (labeled as LP, LS and LPS in Fig. 1a) in the covered momentum space, in addition to the prominent main Fermi surface (LM). One particular Fermi surface sheet LP crosses the main band LM, forming an enclosed loop, an Fermi pocket, near the nodal region. Quantitative Fermi surface data measured from both VUV laser (Fig. 2a) and Helium discharge lamp ( (Fig. 2a) and HP band observed in Helium lamp measurement (Fig. 2b) are intrinsic; they can not be attributed to any of the umklapp bands or shadow bands (Fig. 2c). The location of the three bands can be well connected by the same superlattice vector, indicating that the HP and LPS bands correspond to the first order umklapp bands of the main Fermi pocket LP. The shape 2 and area of the Fermi pockets are also consistent in these two independent measurements, making a convincing case on the presence of the Fermi pocket. We note that in both the laser (Fig. 2a) and Helium lamp (Fig. 2b and SFig. 2 in the Supplementary) measurements, all the observed bands except for the "Fermi pocket bands" can be assigned by only one regular superstructure wavevector (0.24,0.24). The presence of additional superstructure, which would give rise to new bands, appears to be unlikely because there is no indication of such additional bands observed in our measurements.The Fermi pocket is observed both in the normal state and superconducting state, as shown in Fig. 3 for the La-Bi2201 UD18K sample. Moreover, its location, shape and area show little change with temperature (Figs. 3a and 3f). Below T c , the openi...

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confidence: 75%

Coexistence of Fermi arcs and Fermi pockets in a high-Tc copper oxide superconductor

Meng

Liu

Zhang

et al. 2009

Nature

217

198

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“…They find that the gap should be large in the antinodal regions, but that there should be a gapless nodal arc. A gap of this sort is typically seen in the pseudogap phase, for example in Bi 2 Sr 2 CaCu 2 O 8+δ [31], and it has also been observed in a study of La 1.48 Nd 0.4 Sr 0.12 CuO 4 [158]. Nevertheless, a puzzle is left by the ARPES results on LBCO [156] pseudogap ground state that is directly pseudogap 15,16 , our observation of an ap function suggests a very different pictu pseudogap physics with its two aspect distinct momentum regions, that is, t and the antinodal pseudogap of diffe These two aspects might be emphasiz experimental probes in the normal stat extremes of ideas for the pseudogap, in a direct relationship with pairing.…”

Section: Arpes Studiesmentioning

confidence: 57%

Spins, stripes, and superconductivity in hole-doped cuprates

Tranquada¹

2013

AIP Conference Proceedings

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Abstract. One of the major themes in correlated electron physics over the last quarter century has been the problem of high-temperature superconductivity in hole-doped copper-oxide compounds. Fundamental to this problem is the competition between antiferromagnetic spin correlations, a symptom of strong Coulomb interactions, and the kinetic energy of the doped carriers, which favors delocalization. After discussing some of the early challenges in the field, I describe the experimental picture provided by a variety of spectroscopic and transport techniques. Then I turn to the technique of neutron scattering, and discuss how it is used to determine spin correlations, especially in model systems of quantum magnetism. Neutron scattering and complementary techniques have determined the extent to which antiferromagnetic spin correlations survive in the cuprate superconductors. One experimental case involves the ordering of spin and charge stripes. I first consider related measurements on model compounds, such as La 2−x Sr x NiO 4+δ , and then discuss the case of La 2−x Ba x CuO 4 . In the latter system, recent transport studies have demonstrated that quasi-two-dimensional superconductivity coexists with the stripe order, but with frustrated phase order between the layers. This has led to new concepts for the coexistence of spin order and superconductivity. While the relevance of stripe correlations to high-temperature superconductivity remains a subject of controversy, there is no question that stripes are an intriguing example of electron matter that results from strong correlations.Keywords: superconductivity, antiferromagnetism, charge order, stripes, cuprates, nickelates, neutron scattering PACS: 78.70.Nx OPENING REMARKSCuprate superconductivity is a fascinating field, with an enormous literature. There have been a great many measurements done on a wide variety of cuprate families. There are numerous theoretical perspectives on the nature of these materials and on the mechanism of superconductivity.I approach this topic not as an unbiased outside observer, but as a participant who has been around from the beginning. My purpose here is not to present a balanced review of all work and perspectives in the field, as there would be too much to cover. Instead, I will present one story about hole-doped cuprates, based largely on experiment and especially on neutron scattering studies. Since one of the main advantages of neutrons is their ability to follow dynamic antiferromagnetic spin correlations, it should come as no surprise that they will play a key role in the story.I have tried to cite sufficient references (especially review articles) so that the curious reader can find further information and potentially a starting point in searching the broader literature. I have not attempted to cite all relevant work, as that would have been

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“…The crystal structure is orthorhombic at x = 0.07 and 0.15 and tetragonal at x = 0.22. The shadow Fermi surface is observed in ARPES of Bi2212 192,193 , Bi2201 194 , and LSCO 140,195 . The Fermi pocket is observed in Bi2212…”

Section: Pseudogapmentioning

confidence: 93%

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La_2−xSr_xCuO₄

Sugai

Takayanagi

Hayamizu

et al. 2013

J. Phys.: Condens. Matter

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The individual k|| and k ⊥ stripe excitations in fluctuating spin-charge stripes have not been observed yet. Raman scattering has a unique selection rule that the combination of two electric field directions of incident and scattered light determines the observed symmetry. If we set, for example, two electric fields to two possible stripe directions, we can observe the fluctuating stripe as if it is static. Using the different symmetry selection rule between the B1g two-magnon scattering and the B1g and B2g isotropic electronic scattering, we succeeded to obtain the k|| and k ⊥ strip magnetic excitations separately in La2−xSrxCuO4. Only the k ⊥ stripe excitations appear in the wide-energy isotropic electronic Raman scattering, indicating that the charge transfer is restricted to the direction perpendicular to the fluctuating stripe. This surprising restriction is reminiscent of the Burgers vector of an edge dislocation in metal. The edge dislocation easily slides perpendicularly to an inserted stripe and causes ductility in metal. Hence charges at the edge of a stripe move together with the edge dislocation perpendicularly to the stripe, while other charges are localized. A looped edge dislocation has lower energy than a single edge dislocation. The superconducting coherence length is close to the inter-charge stripe distance at x ≤ 0.2. Therefore we conclude that Cooper pairs are formed at looped edge dislocations. The restricted charge transfer direction naturally explains the opening of a pseudogap around (0, π) for the stripe parallel to the b axis and the reconstruction of the Fermi surface to have a flat plane near (0, π). They break the four-fold rotational symmetry. Furthermore the systematic experiments revealed the carrier density dependence of the isotropic and anisotropic electronic excitations, the spin density wave and/or charge density wave gap near (π/2, π/2), and the strong coupling between the electronic states near (π/2, π/2) and the zone boundary phonons at (π, π).

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Electronic structure near the 1/8-anomaly in La-based cuprates

Cited by 66 publications

References 40 publications

Coexistence of Fermi arcs and Fermi pockets in a high-Tc copper oxide superconductor

Coexistence of Fermi arcs and Fermi pockets in a high-Tc copper oxide superconductor

Spins, stripes, and superconductivity in hole-doped cuprates

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La_2−xSr_xCuO₄

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Electronic structure near the 1/8-anomaly in La-based cuprates

Cited by 66 publications

References 40 publications

Coexistence of Fermi arcs and Fermi pockets in a high-Tc copper oxide superconductor

Coexistence of Fermi arcs and Fermi pockets in a high-Tc copper oxide superconductor

Spins, stripes, and superconductivity in hole-doped cuprates

Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La2−xSrxCuO4

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Superconducting pairing and the pseudogap in the nematic dynamical stripe phase of La_2−xSr_xCuO₄