Investigation of the spin dynamics in YBa2Cu3O6+x by inelastic neutron scattering

Rossat‐Mignod, J.; Regnault, L.P.; Vettier, C.; Burlet, P.; Henry, J.Y.; Lapertot, G.

doi:10.1016/0921-4526(91)90208-v

Cited by 364 publications

(136 citation statements)

References 7 publications

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“…8) The calculated results show that the imaginary part is remarkably suppressed at the low frequency in the pseudogap state (Fig. 11(b)).…”

Section: /Tmentioning

confidence: 79%

“…First, the pseudogap was found in the magnetic excitation channel by the nuclear magnetic resonance (NMR) experiment. 1) At present, the pseudogap phenomena have been observed in various quantities which include NMR, 1, 2, 3, 4, 5, 6, 7) neutron scattering, 8) transport, 9, 10) optical spectrum, 11) electronic specific heat, 12) density of states 13) and the single particle spectral weight. 14) The experimental results are reviewed in ref.…”

Section: §1 Introductionmentioning

confidence: 99%

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Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-T_cCuprates

2001

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The pseudogap phenomena in High-Tc cuprates are investigated on the basis of the Hubbard model which includes only the on-site repulsive interaction U . We consider the pairing scenario for the pseudogap. The pseudogap arises from the resonance scattering due to the strong superconducting fluctuations. First, the electronic state and the anti-ferromagnetic spin fluctuations are calculated by using the fluctuation exchange (FLEX) approximation. The T-matrix which is the propagator of the superconducting fluctuations is calculated by extending theÉliashberg equation. The characteristics of the superconducting fluctuations due to the pairing interaction arising from the spin fluctuations are represented in the T-matrix. The self-energy due to the superconducting fluctuations is calculated by the T-matrix approximation. The pseudogap is shown in the single particle properties and the magnetic properties. Moreover, a comprehensive explanation of the doping dependence of the pseudogap is obtained. Furthermore, we apply the theory to the electron-doped cuprates and obtain the consistent results with the recent experiments. Finally, the self-consistent calculation for the spin fluctuations, superconducting fluctuations and the single particle properties are carried out within the FLEX and the self-consistent T-matrix approximations. The relation between the superconducting fluctuations and the spin fluctuations are clarified. The calculated superconducting critical temperature Tc is remarkably reduced from the results of the mean field (FLEX) calculation. In particular, it is shown that the critical temperature decreases with decreasing doping in the under-doped region with large U . The pseudogap phenomena in under-doped High-T c cuprates have been interested for many years. The pseudogap is considered to be a key issue for the comprehensive understanding of the High-T c superconductivity.The pseudogap phenomena mean the suppression of the spectral weight above T c without any long range order. They are universal phenomena observed in various compounds of High-T c cuprates in the under-doped region. First, the pseudogap was found in the magnetic excitation channel by the nuclear magnetic resonance (NMR) experiment. 1) At present, the pseudogap phenomena have been observed in various quantities which include NMR, 1, 2, 3, 4, 5, 6, 7) neutron scattering, 8) transport, 9, 10) optical spectrum, 11) electronic specific heat, 12) density of states 13) and the single particle spectral weight. 14) The experimental results are reviewed in ref. 15.There are many theoretical scenarios proposed for the pseudogap phenomena. An important one is the resonating valence bond (RVB) theory. The RVB theory is an approach from the non-Fermi liquid state and attributes the pseudogap to the singlet pairing of the spinons. 16) As an approach from the Fermi liquid state, the magnetic * E-mail: yanase@hosi.phys.s.u-tokyo.ac.jp * * Present address: Department of Physics, University of Tokyo, Tokyo 113-0033 scenario has been investigated. 17,18) ...

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“…8) The calculated results show that the imaginary part is remarkably suppressed at the low frequency in the pseudogap state (Fig. 11(b)).…”

Section: /Tmentioning

confidence: 79%

Section: §1 Introductionmentioning

confidence: 99%

Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-T_cCuprates

2001

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“…In this subsection, we concentrate on the spin sector of the present model (1). The development of the string correlation (9) indicates the presence of a short-range RVB state which is essentially the same as the VBS state; the state is thus concluded to have a spin gap corresponding to exiting one of the valence bonds to a triplet.…”

Section: Spin Sectormentioning

confidence: 99%

“…Since the existence of a spin gap on high-T c Cu-oxides was reported [1,2], electron systems with a spin gap have been studied in the context of the superconductivity. In order to cause a spin gap, a number of generalizations of interactions have been made by restricting the dimensionality within one dimension: the t-J model with alternating magnetic interaction [3], the t-J model with next-nearest-neighbor magnetic frustration [4], and the double-chain t-J model [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of the hole doping into the Haldane-gap state on the one-dimensional S = 1 t−J model

Nishiyama

Suzuki

1996

Physica B: Condensed Matter

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arXiv:cond-mat/9511035v1 7 Nov 1995 Effect of the hole doping into the Haldane-gap state on the one-dimensional S = 1 t-J model Yoshihiro Nishiyama and Masuo Suzuki Department of Physics, University of Tokyo Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan (Received ) AbstractThe ground state and excitation spectra of the S = 1 Heisenberg spin chain with hole hopping are investigated by means of the numerical-diagonalization method and by the help of the Zhang-Arovas picture. As for the charge sector, two phases are found. It is shown that in the weak-hopping region, a phase separation occurs, while in the strong-hopping region, the system is in the Tomonaga-Luttinger liquid phase. Irrespective of the presence of the spin gap, the present phase diagram is similar to that reported for the S = 1/2 t-J chain with gapless spin excitation rather than to that for the magnetically-frustrated t-J chain with spin gap. For the spin sector, the string correlation is found to develop withstanding the hole doping except in a region, whose region is characterized by a generalized string correlation.This remains an open question to be studied in future.

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“…According to this theory, Cooper pairs are created below T MF and, although there is no phase coherence between them, they suppress the intensity of low energy excitations which looks like a pseudogap, which was directly observed in various experiments including NMR [12], neutron scattering [13], infrared conductivity [14], angle resolved photo emission [15] and scanning tunneling spectroscopy [16]. At a lower temperature, T c , the macroscopic phase coherence sets in and material becomes superconducting.…”

Section: Introductionmentioning

confidence: 99%

Measurement of fluctuation-induced diamagnetism in BSCCO-2212 single crystals using magneto-optics

Sözeri

Dorosinskii

Topal

2006

Physica C: Superconductivity and its Applications

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TurkeyFluctuation induced diamagnetism in BSCCO single crystals with different doping levels ( i.e., different oxygen stoichiometry ) was measured using magneto-optics (MO) in a wide frequency range up to several MHz. A shift in T c onset, measured by MO, of up to 6 K towards higher temperatures was observed at high frequencies in those samples which are far from the optimally doped condition. An explanation of the observed effect in terms of the phase fluctuations of the superconducting order parameter is proposed.

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Investigation of the spin dynamics in YBa2Cu3O6+x by inelastic neutron scattering

Cited by 364 publications

References 7 publications

Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-T_cCuprates

Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-T_cCuprates

Effect of the hole doping into the Haldane-gap state on the one-dimensional S = 1 t−J model

Measurement of fluctuation-induced diamagnetism in BSCCO-2212 single crystals using magneto-optics

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Investigation of the spin dynamics in YBa2Cu3O6+x by inelastic neutron scattering

Cited by 364 publications

References 7 publications

Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-TcCuprates

Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-TcCuprates

Effect of the hole doping into the Haldane-gap state on the one-dimensional S = 1 t−J model

Measurement of fluctuation-induced diamagnetism in BSCCO-2212 single crystals using magneto-optics

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Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-T_cCuprates

Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-T_cCuprates