Effect of phase fluctuations on the single-particle properties of underdoped cuprates

Kwon, H. Dharma; Dorsey, Alan T.

doi:10.1103/physrevb.59.6438

Cited by 90 publications

(106 citation statements)

References 41 publications

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“…19,22,23,24,25,26,27,28,29,30,31,32,33,34,3 They are classified into some kinds. The scenario based on the phase fluctuations has been proposed by Emery and Kivelson 21) and calculated by other authors.…”

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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Section: §1 Introductionmentioning

confidence: 99%

“…The scenario based on the phase fluctuations has been proposed by Emery and Kivelson 21) and calculated by other authors. 22,23) The strong phase fluctuations in the ordered state are expected in the under-doped region since the London …”

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confidence: 99%

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

2001

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“…The expression (14) yields the correct limiting behaviour of S C (q) for q → 0 and should be valid for temperatures not too close to T c . Inserting expression (14) into Eq.…”

Section: Diamagnetic Responsementioning

confidence: 99%

“…(11) gives a similar form of the current-current correlation function C(q) as used by Kwon and Dorsey. 14 (ii) For a strong anisotropy and for the considered temperature range the effective interlayer coupling will be very weak. For evaluating expression (12), we split the double sum over n and n ′ into two parts.…”

Section: Diamagnetic Responsementioning

confidence: 99%

Fluctuating diamagnetism in underdoped high-temperature superconductors

Sewer

Beck

2001

Phys. Rev. B

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The fluctuation induced diamagnetism of underdoped high temperature superconductors is studied in the framework of the Lawrence-Doniach model. By taking into account the fluctuations of the phase of the order parameter only, the latter reduces to a layered XY-model describing a liquid of vortices which can be either thermally excited or induced by the external magnetic field. The diamagnetic response is given by a current-current correlation function which is evaluated using the Coulomb gas analogy. Our results are then applied to recent measurements of fluctuation diamagnetism in underdoped YBCO. They allow to understand both the observed anomalous temperature dependence of the zero-field susceptibility and the two distinct regimes appearing in the magnetic field dependence of the magnetization.

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“…Due to the different physical parameters of HTSC's as mentioned above, there is a wide region in between the normal and the superconducting state which is controlled by fluctuations of the order parameter. In addition to their unique superconducting parameters, HTSC's have a rich temperature-doping (T-δ) phase diagram [5] which affects both the superconducting properties and the strength of fluctuations. of the transition) increases the electrical conductivity of the material above T c ( paraconductivity ).…”

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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Effect of phase fluctuations on the single-particle properties of underdoped cuprates

Cited by 90 publications

References 41 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

Fluctuating diamagnetism in underdoped high-temperature superconductors

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

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Effect of phase fluctuations on the single-particle properties of underdoped cuprates

Cited by 90 publications

References 41 publications

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

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

Fluctuating diamagnetism in underdoped high-temperature superconductors

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