<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">k</mml:mi></mml:math>-Dependent Electronic Structure, a Large “Ghost” Fermi Surface, and a Pseudogap in a Layered Magnetoresistive Oxide

Dessau, D. S.; Saitoh, T.; Park, C.-H.; Shen, Zhi‐Xun; Villella, P.; Hamada, Nobuyuki; Moritomo, Y.; Tokura, Y.

doi:10.1103/physrevlett.81.192

Cited by 211 publications

(189 citation statements)

References 25 publications

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“…The existence of this pseudogap feature was remarked theoretically in [24]. Photoemission experiments have also unveiled a similar behavior in bilayer manganites [25]. It is expected that pseudogaps would appear in the density of states in the regimes of inhomogeneities, as a natural consequence of the competition between a metal (flat DOS) and an insulator (gapped DOS).…”

Section: Electronic Phase Separation In Manganitesmentioning

confidence: 72%

Nanoscale phase separation in colossal magnetoresistance materials: lessons for the cuprates?

Dagotto

Burgy

Moreo

2003

Solid State Communications

107

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A recent vast experimental and theoretical effort in manganites has shown that the colossal magnetoresistance effect can be understood based on the competition of charge-ordered and ferromagnetic phases. The general aspects of the theoretical description appear to be valid for any compound with intrinsic phase competition. In high temperature superconductors, recent experiments have shown the existence of intrinsic inhomogeneities in many materials, revealing a phenomenology quite similar to that of manganese oxides. Here, the results for manganites are briefly reviewed with emphasis on the general aspects. In addition, theoretical speculations are formulated in the context of Cu-oxides by mere analogy with manganites. This includes a tentative explanation of the spin-glass regime as a mixture of antiferromagnetic and superconducting islands, the rationalization of the pseudogap temperature T * as a Griffiths temperature where clusters start forming upon cooling, the prediction of "colossal" effects in cuprates, and the observation that quenched disorder may be far more relevant in Cu-oxides than previously anticipated.

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Section: Electronic Phase Separation In Manganitesmentioning

confidence: 72%

Nanoscale phase separation in colossal magnetoresistance materials: lessons for the cuprates?

Dagotto

Burgy

Moreo

2003

Solid State Communications

107

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“…Note that this does not correspond to the usual atomic, anti-adiabatic limit [35], where it is assumed from the beginning that D → 0 is the smallest energy scale in the problem, resulting in dispersionless high energy features. The present theory is valid in the opposite limit, D ≫ ω 0 , which is more often realized in solids [36,37,38]. Due to the large transfer integrals between molecular units, the discrete shakeoff spectrum characteristic of isolated molecules is converted here into a continuous gaussian spectral density [16], and a sizeable high-energy dispersion is recovered.…”

Section: B Strong Coupling Limitmentioning

confidence: 80%

Spectral properties and isotope effect in strongly interacting systems: Mott-Hubbard insulator versus polaronic semiconductor

Fratini

Ciuchi

2005

Phys. Rev. B

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We study the electronic spectral properties in two examples of strongly interacting systems: a Mott-Hubbard insulator with additional electron-boson interactions, and a polaronic semiconductor. An approximate unified framework is developed for the high energy part of the spectrum, in which the electrons move in a random field determined by the interplay between magnetic and bosonic fluctuations. When the boson under consideration is a lattice vibration, the resulting isotope effect on the spectral properties is similar in both cases, being strongly temperature and energy dependent, in qualitative agreement with recent photoemission experiments in the cuprates.

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“…This last observation is puzzling given the general expectation of strong interactions in the manganites. Moreover, the value for the inplane conductivity calculated with the ARPES parameters is nearly one order of magnitude higher than that measured by transport [9][10][11] .…”

mentioning

confidence: 96%

“…For a single polaron the spectral function consists of a low-energy 'zero-phonon' quasiparticle peak representing the centre of mass of the quantum motion of the polaron, and a high-energy incoherent resonance. It was recently demonstrated that in general the peak position of the incoherent resonance has to track closely the bare dispersion 9,[15][16][17] . This reflects the motions of the undressed electron confined in the polaron cloud, and a similar picture has been suggested for underdoped copper oxides 15 .…”

mentioning

confidence: 99%

Nodal quasiparticle in pseudogapped colossal magnetoresistive manganites

Mannella

Yang

Zhou

et al. 2005

Nature

Self Cite

255

207

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A characteristic feature of the copper oxide high-temperature superconductors is the dichotomy between the electronic excitations along the nodal (diagonal) and antinodal (parallel to the Cu-O bonds) directions in momentum space, generally assumed to be linked to the 'd-wave' symmetry of the superconducting state. Angle-resolved photoemission measurements in the superconducting state have revealed a quasiparticle spectrum with a d-wave gap structure that exhibits a maximum along the antinodal direction and vanishes along the nodal direction 1 . Subsequent measurements have shown that, at low doping levels, this gap structure persists even in the high-temperature metallic state, although the nodal points of the superconducting state spread out in finite 'Fermi arcs' 2 . This is the so-called pseudogap phase, and it has been assumed that it is closely linked to the superconducting state, either by assigning it to fluctuating superconductivity 3 or by invoking orders which are natural competitors of d-wave superconductors 4,5 . Here we report experimental evidence that a very similar pseudogap state with a nodal-antinodal dichotomous character exists in a system that is markedly different from a superconductor: the ferromagnetic metallic groundstate of the colossal magnetoresistive bilayer manganite La 1.2 Sr 1.8 Mn 2 O 7 . Our findings therefore cast doubt on the assumption that the pseudogap state in the copper oxides and the nodal-antinodal dichotomy are hallmarks of the superconductivity state. La 1.2 Sr 1.8 Mn 2 O 7 (LSMO) is a prototypical bilayer manganite that exhibits the colossal magnetoresistance (CMR) effect-the extremely large drop in resistivity induced by application of a magnetic field near the Curie temperature (T C ) 6,7 . The CMR effect exploits a metalinsulator transition between a low-temperature ferromagnetic-metallic ground state and a high-temperature paramagnetic-insulating phase. The nature of the ferromagnetic-metallic ground state in LSMO remains highly controversial. On the one hand, the underlying Fermi surface and band structure have clear resemblance to those of the copper oxides 8 (Lin, H., Sahrakorpi, S., Barbiellini, B. & Bansil, A., personal communication on full potential band structure and Fermi surface computations for x ¼ 0.4). On the other hand, previous angle-resolved photoemission (ARPES) investigations revealed no quasiparticle peak, a suppression of spectral weight at the Fermi level (E F ) (the pseudogap), and an unusually light effective mass, a factor of two lighter than the calculated band structure value. This last observation is puzzling given the general expectation of strong interactions in the manganites. Moreover, the value for the inplane conductivity calculated with the ARPES parameters is nearly one order of magnitude higher than that measured by transport 9-11 .Our ARPES experiments resolve the controversy of the lowtemperature ferromagnetic-metallic groundstate of LSMO by demonstrating that its electronic structure is strikingly similar to that found in th...

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k-Dependent Electronic Structure, a Large “Ghost” Fermi Surface, and a Pseudogap in a Layered Magnetoresistive Oxide

Cited by 211 publications

References 25 publications

Nanoscale phase separation in colossal magnetoresistance materials: lessons for the cuprates?

Nanoscale phase separation in colossal magnetoresistance materials: lessons for the cuprates?

Spectral properties and isotope effect in strongly interacting systems: Mott-Hubbard insulator versus polaronic semiconductor

Nodal quasiparticle in pseudogapped colossal magnetoresistive manganites

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