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Tranquada, J. M.; Heald, S. M.; Moodenbaugh, A. R.; Suenaga, M.

doi:10.1103/physrevb.35.7187

Cited by 186 publications

(30 citation statements)

References 14 publications

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“…In La 2−x Sr x NiO 4 , the spin excitations emerging from the magnetic superlattice peaks disperse two-dimensionally into cones of spin waves that eventually merge at high energy. 23 A recent study 24 on La 2 NiO 4.11 finds that, at energies below ∼20 meV, where constant-energy scans through a spin-wave cone cannot resolve its structure, there is a small dispersion of the spin excitations toward Q AF , which has not been reproduced by spin-wave models. A similar inward dispersion of the low-energy magnetic excitations was observed 15 in LSCO with x = 0.04 and there are slight indications of such a dispersion in the present sample.…”

Section: Discussionmentioning

confidence: 99%

“…23,24 Of course, a significant difference is that the stripe order in the nickelates is only observed in a substantially higher range of doping, so that the spin-stripe period is considerably smaller. In La 2−x Sr x NiO 4 , the spin excitations emerging from the magnetic superlattice peaks disperse two-dimensionally into cones of spin waves that eventually merge at high energy.…”

Section: Discussionmentioning

confidence: 99%

“…Of course, a big difference is that in the cuprates these effects are seen in close proximity to E cross , while the effect in La 2 NiO 4.11 occurs at energies well below the anticipated merging of the spin-wave cones. 24 The spin modulation that orders at low temperatures in our LSCO crystal is oriented by the anisotropy of the LTO lattice structure. In terms of the electronic liquid crystal metaphor, 41 the ordered state would correspond to a smectic phase, as in the bond-parallel stripe ordered phase of La 2−x Ba x CuO 4 (LBCO) within the low-temperature tetragonal structure.…”

Section: Discussionmentioning

confidence: 99%

“…Note that despite the formation of the AF regime near the Mott transition, there is no noticeable enhancement of the optical mass. Bottom panels show CONSTANT EFFECTIVE MASS ACROSS THE PHASE… PHYSICAL ments on LSCO showed an absence of significant change with doping [24], as indicated in Fig. 15.…”

Section: X-ray Absorption Spectroscopymentioning

confidence: 99%

“…According to Ref. [24], this point in the phase diagram is a quantum critical point associated with the doping-induced disappearance of a putative order parameter characterizing the pseudogap phase. Therefore, it is tempting to relate the anomalous hole doping dependencies shown in Fig.…”

Section: Spin Resonancementioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%