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Zhou, Jianshi; Chen, H.; Goodenough, John B

doi:10.1103/physrevb.49.9084

Cited by 33 publications

(16 citation statements)

References 31 publications

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“…The form of the anomaly -a minimum in the sound velocity -is suggestive of a low-frequency relaxation process, such as domain wall motion [605]. A resistive anomaly is found in the same regime (≈ 37K) in overdoped LSCO [278]. Similar anomalies are reported above T c , at 95K in LSCO (x = 0.2) and at 120K in YBCO [606].…”

Section: Anomalies At Tcsupporting

confidence: 70%

“…At even higher doping levels (so far, only found in thin films) an even higher, 55-60K superconductor is found [158]. In overdoped LSCO, Zhou, et al [278] find several doping ranges in which there are two coexisting superconducting phases, even though x-ray analysis finds only one phase present.…”

Section: Superconductivitymentioning

confidence: 99%

“…LSCO provides an exception to the universal scaling behavior: dT c /dp is large and roughly doping dependent around the optimum doping [275,276]; in the overdoped phase, it remains positive in the orthorhombic phase, and essentially zero in the tetragonal phase [277,278]. This can be understood readily: for most cuprates, the doping of the CuO 2 planes is delicately controlled by charge transfer from other layers, and the main effect of pressure is to alter that balance, producing an excess hole doping.…”

Section: Pressure Dependence Of Tcmentioning

confidence: 99%

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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 Tcsupporting

confidence: 70%

Section: Superconductivitymentioning

confidence: 99%

Section: Pressure Dependence Of Tcmentioning

confidence: 99%

See 1 more Smart Citation

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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“…In the case of the copper-oxide superconductors, which are also at a cross-over from localized to itinerant electronic behavior, we have argued that pseudo J-T deformations in the copper-oxide superconductors are dynamic and stabilize non-adiabatic, multi-copper dielectric polarons that condense into mobile stripes consisting of alternating hole-rich and hole-poor ribbons within the superconductive CuO 2 planes (67)(68)(69)(70)(71)(72)(73).…”

Section: At Temperatures T > T C the Paramagnetic Susceptibility Ofmentioning

confidence: 99%

Jahn-Teller Phenomena in Solids

Goodenough

1998

Annu. Rev. Mater. Sci.

Self Cite

259

217

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Jahn-Teller phenomena encountered in oxides are reviewed briefly. High-spin Mn(III) in an octahedral site illustrates an ion with twofold orbitally degenerate σ -bonding orbitals having a quenched orbital angular momentum; octahedral V(III) and high-spin Co(II), as well as tetrahedral high-spin Ni(II), are examples of ions with threefold orbitally degenerate π-bonding orbitals that retain orbital angular momentum. Cooperative local deformations that are static give rise, below a transition temperature T t , to a lowering of the lattice symmetry, anisotropic interactions, and the possibility of a ferromagnetism that is oriented in opposition to a magnetic field applied on cooling through the transition. Dynamic local deformations can influence the physical properties of a solid in a variety of ways. Of special interest is the influence of dynamic deformations at a cross-over from localized to itinerant electronic behavior in a mixed-valent system.

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“…1c) and simultaneously the superconducting transition temperature ¹ decreases sharply (1,3). Measurements on samples with z40.18 under hydrostatic pressure showed that ¹ J J increases linearly with pressure but does not vary as soon as the tetragonal phase is induced by pressure (4,5). This change in *¹ J J /*P is believed to be related with the orthorhombic}tetragonal transition (3) and thus, the maximum in ¹ occurs when the CuO planes are #at or almost #at.…”

Section: Lamentioning

confidence: 90%