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Haga, T.; Yamaya, K.; Abe, Yutaka; Tajima, Yukimichi; Hidaka, Y.

doi:10.1103/physrevb.41.826

Cited by 72 publications

(14 citation statements)

References 16 publications

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“…However, while a second group also reported channeling anomalies [589], the two studies are not mutually consistent. A more recent study on films found no evidence for channeling anomalies [590].…”

Section: Anomalies At Tcmentioning

confidence: 89%

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Markiewicz

1997

Journal of Physics and Chemistry of Solids

371

280

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The Van Hove singularity (VHS) provides a paradigm for the study of the role of peaks in the density of states (dos) on electronic properties. More importantly, it appears to play a major role in the physics of the high-Tc superconductors, particularly since recent photoemission studies have found that the VHS is close to the Fermi level in most of the high-Tc cuprates near the composition of optimum Tc. This paper offers a comprehensive survey of the VHS model, describing both theoretical properties and experimental evidence for the picture. Special topics discussed include a survey of the Fermi surfaces of the cuprates and related compounds, and an analysis of the reliability of the slave boson approach to correlation effects. While many properties of the cuprates can be qualitatively understood by a simple rigid-band-filling model, this is inadequate for more quantitative results, since correlation effects tend to pin the Fermi level near the VHS over an extended doping range, and can lead to a nanoscale phase separation. Furthermore, the peaks in the dos lead to competition from other instabilities, both magnetic and structural (related to charge density waves). A novel form of dynamic structural instability, involving dynamic VHS-Jahn-Teller effects has been predicted. Scattered through the literature, there is considerable experimental evidence for both nanoscale phase separation of holes, and for local, possibly dynamic, structural disorder. This review attempts to gather these results into a comprehensive database, to sort the results, and to see how they fit into the Van Hove scenario. Recent experiments on underdoped cuprates are found to provide a strong confirmation that the pseudogap is driven by a splitting of the VHS degeneracy.

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Section: Anomalies At Tcmentioning

confidence: 89%

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Markiewicz

1997

Journal of Physics and Chemistry of Solids

371

280

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“…[1]. More specifically, a number of local probes has shown this connection: neutron scattering studies [2,3] of the probability distribution function for atoms in the CuO 2 plane show clear local distortions at the transition temperature T c in several systems; ion-channeling [4] shows anomalous changes in the oscillation amplitudes of Cu and O atoms not only at T c , but also at temperatures above it; EXAFS experiments [5] show changes in the environments of both Cu and apical O atoms; ultrasound measurements [6] show alterations of the elastic constants of the crystal. Among the more general probes, there have been various reports from Raman scattering and infrared reflectivity investigations [7,8,9] which indicate anomalous temperature-dependences in the frequency shift and linewidth of phonons around and above the superconducting transition.…”

Section: Introductionmentioning

confidence: 99%

Spin-phonon coupling in the single-layer extendedt-Jmodel

1996

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We consider the implications of spin-phonon coupling within the slave-boson, meanfield treatment of the extended t-J model of a high-temperature superconductor. In bilayer cuprates such as YBaCuO, where the CuO 2 plane is buckled, this interaction is linear in O displacement along the c-axis, and the coupling constant is found to be large. The formation of a spin singlet causes additional contributions to the phonon self-energy, and we calculate from these the superconductive phonon anomalies. The magnitude and sign of the frequency shift and linewidth broadening for various mode symmetries correspond well with Raman and infra-red light scattering experiments, and with neutron scattering studies. In the t-J model, spin singlet formation and superconductivity do not coincide in the low-doping regime, giving rise to spin-gap features and a variety of temperature scales in the spin response observed by NMR and neutron investigations. Phonon anomalies in underdoped YBaCuO compounds indeed show evidence of spingap phenomena with the same characteristic temperature, suggesting that the theory may offer the possibility of a unified understanding of the anomalies in magnetic and lattice properties. While the origin of the superconducting interaction is electronic, this spin-phonon coupling affords the possibility of a small isotope effect, and our estimate is in good agreement with recent site-selective O-substitution experiments.

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“…Further, the complicated band structures for these materials make analysis of carrier density changes between them equally challenging, although their Fermi surfaces are rather similar. 24,25 As discussed above, the coexistence of magnetism and superconductivity, rather than their competition, appears to be the rule and not the exception for U-based heavy …”

mentioning

confidence: 97%

Coexistence of magnetism and superconductivity inCeRh1−xIrxIn
Pagliuso
¹
,
Petrović
²
,
Movshovich
³

et al. 2001
Phys. Rev. B
177
5
129
0
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We report a thermodynamic and transport study of the phase diagram of CeRh 1-x Ir x In 5 . Superconductivity is observed over a broad range of doping, 0.3 < x < 1, including a substantial range of concentration (0.3 < x <0.6) over which it coexists with magnetic order (which is observed for 0 < x < 0.6). The anomalous transition to zero resistance that is observed in CeIrIn 5 is robust against Rh substitution. In fact, the observed bulk T c in CeRh 0.5 Ir 0.5 In 5 is more than double that of CeIrIn 5 , whereas the zeroresistance transition temperature is relatively unchanged for 0.5 < x < 1. PACS number(s) 74.70.Tx, 71.27.+a, 75.40.Cx Submitted to PRL

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Ion-channeling anomalies at the superconducting transition temperature in single-crystalYBa2Cu3<

Cited by 72 publications

References 16 publications

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Spin-phonon coupling in the single-layer extendedt-Jmodel

Coexistence of magnetism and superconductivity inCeRh1−xIrxIn
Pagliuso
¹
,
Petrović
²
,
Movshovich
³

et al. 2001
Phys. Rev. B
177
5
129
0
View full text Add to dashboard Cite

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Ion-channeling anomalies at the superconducting transition temperature in single-crystalYBa2Cu3<

Cited by 72 publications

References 16 publications

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

A survey of the Van Hove scenario for high-tc superconductivity with special emphasis on pseudogaps and striped phases

Spin-phonon coupling in the single-layer extendedt-Jmodel

Coexistence of magnetism and superconductivity inCeRh1−xIrxInPagliuso1, Petrović2, Movshovich3 et al. 2001Phys. Rev. B17751290View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Coexistence of magnetism and superconductivity inCeRh1−xIrxIn
Pagliuso
¹
,
Petrović
²
,
Movshovich
³

et al. 2001
Phys. Rev. B
177
5
129
0
View full text Add to dashboard Cite