Infrared properties of high Tc superconductors

Schlesinger, Z.; Rotter, L. D.; Collins, R. T.; Holtzberg, F.; Feild, C.; Welp, U.; Crabtree, G. W.; Liu, J.Z.; Fang, Y.; Vandervoort, K. G.

doi:10.1016/0921-4534(91)91950-9

Cited by 43 publications

(20 citation statements)

References 23 publications

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“…Further evidence for the charged 2e Bose liquid was provided by the quantitative mapping of the specific heat of several high-T c cuprates in zero magnetic field to the l curve of He 4 [12]. Also the in-plane and c axes transport as well as the normal state gap observed in the NMR [13], the infrared reflectivity [14], and the angle-resolved photoemission [15], all find a satisfactory explanation in the preformed boson model [16 -19].…”

mentioning

confidence: 99%

Contrasting Effects of Magnetic Field on Thermodynamic and Resistive Transitions in High-TcCuprates

Alexandrov¹,

Beere²,

Kabanov³

et al. 1997

Phys. Rev. Lett.

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confidence: 99%

Contrasting Effects of Magnetic Field on Thermodynamic and Resistive Transitions in High-TcCuprates

Alexandrov¹,

Beere²,

Kabanov³

et al. 1997

Phys. Rev. Lett.

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“…Analysis of experimental data has shown [2][3][4] that all such compounds are ion semiconductors and their "metal" conductivity is connected with defects i.e. Analysis of experimental data has shown [2][3][4] that all such compounds are ion semiconductors and their "metal" conductivity is connected with defects i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Analysis of experimental data has shown [2][3][4] that all such compounds are ion semiconductors and their "metal" conductivity is connected with defects i.e. It has been shown that, for the exchange energy 1 00 meV and the doping level (n) 0.1 hole/cell, the temperature T decrease below the critical point T* 1 50 K leads to formation of a spatially non-unilorm distribution of holes (the 'stripe-structure") and to appearance of corresponding energy gap in the electronic structure.…”

mentioning

confidence: 99%

<title>Kinetics of stripes and pseudogap in high-temperature superconductors</title>

2002

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To interpret the data of transient nonlinear spectroscopy of cooper-oxide high-temperature superconductors, a phenomenological model, describing "magneto-dipole" self-organization of holes in 2 planes and kinetics of the corresponding phase transition, has been developed. It has been shown that, for the exchange energy 1 00 meV and the doping level (n) 0.1 hole/cell, the temperature T decrease below the critical point T* 1 50 K leads to formation of a spatially non-unilorm distribution of holes (the 'stripe-structure") and to appearance of corresponding energy gap in the electronic structure. Calculated steady-state dependencies of T* on (n) and ofthe gap width on T agree with the known experimental data. The predicted phase transition kinetics depends on the initial temperature T . When T* < T < Tm (i .4 ÷ 1 .5) T* the stripe-structure decay is rather slow (-4O s and more) two-stage process. During the first stage, a large-scale fluctuation of an average dipole moment is formed and after that the spatial region, entrained in the fluctuation, broadens as the phase switching wave. . INTRODUCTIONDiscovery [1] ofhigh-temperature superconductivity (HTSC) of copper-oxide compounds has led to explosion of scientific activity. Analysis of experimental data has shown [2][3][4] that all such compounds are ion semiconductors and their "metal" conductivity is connected with defects i.e. with violations ofstoichiometry ("doping"). Electronic structure of the compounds is determined by an interaction of"well" and "badly" localized electronic states, which are sensitive to shortrange ordering of atoms. Strong anisotropy leads to quasi-two-dimensional (2D) character ofthe Fermi surface.A general property of all such compounds is ordered spins s of Cu ions in so-called Cu02 planes. In stochiometric compositions, these ions (usually denoted as Cu2) have "holes" ( s = 1/2 ) inside their 3d-shells. Indirect (through 0 ions) L'\haflgc interaction establishes long-range antiferromagnetic order with rather high critical temperature TN = 300 ÷ 500K [5]. Neutron-scattering studying of metal-phase La2CuO4 and YBa2Cu3O7_ has not found long-range magnetic order but has revealed rather strong and broadband spin fluctuations [6]. It has been shown that magnetic moments of Cu2 ions are ordered in antiferromagnetic way and magnetic moment localized on so-called Cul ions (in Cu -0 chains) is zeroed.Diffusion magnetic scattering has enabled one to determine the dependence ofthe spin correlation length m on the mean concentration ofholes (n) in Cu02 planes [7]. Inelastic neutron scattering has enabled one to find the constants of exchange interaction between two nearest Cu2 ions ( 2J 0,170 eV), Cu2 ions oftwo nearest CuO2 planes ( 2b 10_2 2J ), Cu2 and Cul ions ( 2J' iO-5 2J ) for YBa2Cu3O7_ [8]. Analogous data have been obtained for La26SrCuO4 [9]. These measurements have proved quasi-2D character of spin dynamics in copper-oxide compounds.The nature of energy gap in electronic structure is very important for understanding of HTSC phenomena. In ...

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“…Far-infrared spectroscopy of high-T c superconductors has provided much valuable information about low-energy electronic excitations [1][2][3][4][5][6][7]. The in-plane optical conductivity σ 1 (ω, T ) is believed to provide a sensitive probe for detecting the dynamic properties of the carriers in the CuO 2 plane.…”

Section: Introductionmentioning

confidence: 99%

In-plane optical conductivity due to scattering from spin fluctuations in d-wave superconductors

Zhao¹,

Li²,

Gong³

et al. 2002

J. Phys.: Condens. Matter

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The in-plane optical conductivity of high-Tc cuprates in the superconducting (SC) and normal states is studied on the basis of the slave-boson mean-field approach to the 2D t–t′–J model and the antiferromagnetic spin fluctuation correction in the framework of the renormalized random-phase approximation. The mid-infrared contribution to the conductivity in the normal state and the peak/dip/hump feature of the spectra in the SC state are reproduced, and are shown to be caused by coupling to spin fluctuations, in particular by coupling to the resonance mode of the spin fluctuations.

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Infrared properties of high Tc superconductors

Cited by 43 publications

References 23 publications

Contrasting Effects of Magnetic Field on Thermodynamic and Resistive Transitions in High-TcCuprates

Contrasting Effects of Magnetic Field on Thermodynamic and Resistive Transitions in High-TcCuprates

<title>Kinetics of stripes and pseudogap in high-temperature superconductors</title>

In-plane optical conductivity due to scattering from spin fluctuations in d-wave superconductors

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