Carrier-density-dependent momentum shift of the coherent peak and the LO phonon mode in<i>p</i>-type high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors

Sugai, S.; Suzuki, Haruyuki; Takayanagi, Y.; Hosokawa, Takehiko; Hayamizu, N.

doi:10.1103/physrevb.68.184504

Cited by 128 publications

(186 citation statements)

References 79 publications

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“…The nature of the 2-magnon process could change when antiferromagnetic CuO 2 layers are doped, but the energy of the peak intensity provides a measure of the effective J describing the magnetic correlations. Figure 46 shows B 1g -symmetry Raman spectra for four cuprate families as a function of doping, from Sugai et al [80]. For each of the antiferromagnetic parent compounds, one can see a strong 2-magnon peak centered at 2500-3000 cm −1 ≈ 310-380 meV.…”

Section: -Magnon Raman Scatteringmentioning

confidence: 99%

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: -Magnon Raman Scatteringmentioning

confidence: 99%

Spins, stripes, and superconductivity in hole-doped cuprates

Tranquada¹

2013

AIP Conference Proceedings

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“…For the case of the hole-doped high-T c cuprates, while the two-magnon peak of the AF parent compounds is relatively sharp in the B 1g spectra, it becomes broader and the peak energy becomes smaller with hole doping. 44 However, because Se substitution is isovalent doping and the parent compound Fe 1.074 Te is an itinerant antiferromagnet, while the parent compound of the high-T c cuprates is an antiferromagnetic insulator, it may be reasonable that doping dependence is so different from the cuprates. Anyway from these results, we can say that almost the same magnetic excitations and/or magnetic fluctuations exist even in the superconducting FeTe 0.6 Se 0.4 with the antiferromagnetic Fe 1.074 Te.…”

Section: B Two-magnon Raman Scatteringmentioning

confidence: 99%

Phonon, two-magnon, and electronic Raman scattering of Fe1+yTe1−xSe
Okazaki
¹
,
Sugai
²
,
Niitaka
³

et al. 2011
Phys. Rev. B
Self Cite

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We have measured Raman scattering spectra of single-crystalline FeTe0.6Se0.4 (Tc ∼ 14.5 K) and its parent compound Fe1.074Te at various temperatures. In the parent compound Fe1.074Te, A1g and B1g modes have been observed at 157.5 and 202.3 cm −1 , respectively, at 5 K. These frequencies qualitatively agree with the calculated results. Two-magnon excitation has been observed around 2300 cm −1 for both compounds. Temperature dependence between the electronic Raman spectra below and above Tc has been observed and 2∆ and 2∆/kB TC have been estimated as 5.0 meV and 4.0, respectively.

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“…The energy scale given by two-magnon excitations in optimally doped Bi2212 cuprates [43] is J ~ ω(2M)/2.7 = = 833 K (573 cm -1 ), which is almost two times less than in the parent compound (J ~ 1150 cm -1 [44] provide an estimate T c ~ 0.3J = 250 K, which is well above the experimental value. For estimates below, we will use empirical relation T c ~ 0.1J, calculated for T c ~90 K, J = = 833 K. One of the missing parameters for discussion is doping dependence of J, which we derive from the paper by Sugai et al [43] to be dJ/dδ = -6.4·10 3 K, δ -doping parameter, δ = 0.16 for optimum doping [43].…”

Section: Antiferromagnetic Fluctuations As Pairing Glue For High-t C mentioning

confidence: 56%

“…For estimates below, we will use empirical relation T c ~ 0.1J, calculated for T c ~90 K, J = = 833 K. One of the missing parameters for discussion is doping dependence of J, which we derive from the paper by Sugai et al [43] to be dJ/dδ = -6.4·10 3 K, δ -doping parameter, δ = 0.16 for optimum doping [43]. It is interesting to note here that pairing temperature T * = 0.3J, as estimated from the Hubbard model [44], follows closely pseudogap dependence [45] in Bi2212 material.…”

Section: Antiferromagnetic Fluctuations As Pairing Glue For High-t C mentioning

confidence: 99%

Magnon–phonon coupling and implications for charge-density wave states and superconductivity in cuprates

Struzhkin

Chen

2016

Low Temperature Physics

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The mechanism of high-temperature superconductivity of copper oxides (cuprates) remains unsolved puzzle in condensed matter physics. The cuprates represent extremely complicated system, showing fascinating variety of quantum phenomena and rich phase diagram as a function of doping. In the suggested "superconducting glue" mechanisms, phonon and spin excitations are invoked most frequently, and it appears that only spin excitations cover the energy scale required to justify very high transition temperature T c ~ 165 K (as in mercury-based triple layer cuprates compressed to 30 GPa). It appears that pressure is quite important variable helping to boost the T c record by almost 30 degrees. Pressure may be also considered as a clean tuning parameter, helping to understand the underlying balance of various energy scales and ordered states in cuprates. In this paper, a review of mostly our work on cuprates under pressure will be given, with the emphasis on the interactions between phonon and spin excitations. It appears that there is a strong coupling between superexchange interaction and stretching in-plane oxygen vibrations, which may give rise to a variety of complex phenomena, including the charge-density wave state intertwined with superconductivity and attracting a lot of interest recently. PACS

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Carrier-density-dependent momentum shift of the coherent peak and the LO phonon mode inp-type high-Tcsuperconductors

Cited by 128 publications

References 79 publications

Spins, stripes, and superconductivity in hole-doped cuprates

Spins, stripes, and superconductivity in hole-doped cuprates

Phonon, two-magnon, and electronic Raman scattering of Fe1+yTe1−xSe
Okazaki
¹
,
Sugai
²
,
Niitaka
³

et al. 2011
Phys. Rev. B
Self Cite

Magnon–phonon coupling and implications for charge-density wave states and superconductivity in cuprates

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Carrier-density-dependent momentum shift of the coherent peak and the LO phonon mode inp-type high-Tcsuperconductors

Cited by 128 publications

References 79 publications

Spins, stripes, and superconductivity in hole-doped cuprates

Spins, stripes, and superconductivity in hole-doped cuprates

Phonon, two-magnon, and electronic Raman scattering of Fe1+yTe1−xSeOkazaki1, Sugai2, Niitaka3 et al. 2011Phys. Rev. BSelf Cite

Magnon–phonon coupling and implications for charge-density wave states and superconductivity in cuprates

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Resources

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Phonon, two-magnon, and electronic Raman scattering of Fe1+yTe1−xSe
Okazaki
¹
,
Sugai
²
,
Niitaka
³

et al. 2011
Phys. Rev. B
Self Cite