The electron transport phenomena in Y based HTSC's and their analysis on the basis of phenomenological narrow-band theory the band structure transformation with oxygen content and substitution for Cu

Gasumyants, V. É.; Kaidanov, V. I.; Vladimirskaya, E. V.

doi:10.1016/0921-4534(95)00173-5

Cited by 100 publications

(85 citation statements)

References 38 publications

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“…(2) S(T) exhibits a broad maximum which shifts towards lower temperature with increasing x. These features have been reported for a variety of holedoped cuprate systems [9,10,[13][14][15]23].…”

Section: Properties Of S(t)mentioning

confidence: 78%

“…Data on S(T) in hole-doped cuprates have been analyzed in terms of several theoretical models, other than a simple Fermi-liquid picture which leads to S(T) ∝ T, including a narrow conduction-band model [9,10], a Boson-Fermion theory [13], a pseudogap model [14] and a two-band theory [15]. Because of the wide availability to both metallic and degenerated semiconducting systems, we will adopt the first model in which spectrum of the conduction-band is assumed to contain a sharp peak near the Fermi level.…”

Section: Methods Of Experiments and Analysismentioning

confidence: 99%

“…A comparison to this model can provide insight into the band spectrum through three adjustable parameters: the band-filling factor F, the effective width of the conduction band W D and that of the delocalized states W σ . The expression for S(T) takes the form [9,10]:…”

Section: Methods Of Experiments and Analysismentioning

confidence: 99%

“…The thermoelectric power is analyzed in terms of a narrow band model [9,10], from which we could obtain variations of band-spectrum parameters against the Ce content. As far as the present analysis is concerned, we conclude that a main feature of the thermoelectric power in both p-type and n-type cuprates is attributed from the same modifications of the band structure upon carrier doping.…”

Section: Introductionmentioning

confidence: 99%

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Thermoelectric power and resistivity in Nd2−Ce CuO4 system

Môri

Kameyama

Enomoto

et al. 2006

Journal of Alloys and Compounds

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Section: Properties Of S(t)mentioning

confidence: 78%

Section: Methods Of Experiments and Analysismentioning

confidence: 99%

Section: Methods Of Experiments and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermoelectric power and resistivity in Nd2−Ce CuO4 system

Môri

Kameyama

Enomoto

et al. 2006

Journal of Alloys and Compounds

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“…Therefore, the respective contributions to the total conductivity were zero. The widths of the narrow bands were both set equal to 0.05 eV which corresponds to the upper limit of the CB1 band width at 8 --~ 0 [18]. Also, (14) the respective densities of states in the narrow bands we assumed to be invariable and approximately equal to 10 states.eV-l.cel1-1 at the first stage of calculations.…”

Section: E2 E1 N(e)mentioning

confidence: 99%

Thermodynamics of the movable oxygen and conducting properties of the solid solution YBa2Cu3-xCoxO6+δ at high temperatures

Патракеев

Митберг

Lakhtin

et al. 1998

Ionics

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Abstract. High precision coulometric measurements of the equilibrium oxygen content in the solid solution YBa2Cu3_xCOxO6+6, where x = 0, 0.2, 0.4, 0.6 and 0.8, were carded out using a double-cell technique in the temperature range 600 -850 ~ and at oxygen pressure varying between 10 .5 and 1 atm. The data were employed to determine the partial molar enthalpy and entropy of the movable oxygen depending on 8 and x. The electrical conductivity and thermopower were also measured in the same range of the external parameters, and their dependence on the oxygen concentration was determined at different cobalt content. The data reveal several types of oxygen sites participating in the gas-solid equilibrium. The behavior of thermodynamic functions is indicative of the partial ordering of the complex species which form the structural layer Cul_xCoxO 6 with variable content of oxygen and cobalt. It was shown that replacement of copper by cobalt does not result in appearance of the electronic charge carriers. The behavior of the thermopower and electric conductivity was explained with a narrow band model. The energy change with 8 and x of the p-band, which dominates the conductivity, was found to follow the respective change in the oxygen partial enthalpy. Thus, electronic carriers in the layered structure of the cuprate are strongly influenced by the labile oxygen ions.

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A comparative study of thermoelectric properties in (Pr,Y)Ba₂Cu₃O₇ and PrBa₂Cu₃O₇–Ag percolative systems

Môri

Okano

Furuya

2006

Physica Status Solidi (a)

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PACS 72. 74.25.Fy, 74.72.Bk Measurements of the temperature-dependent thermoelectric power S(T) and resistivity ρ(T) were performed to characterize two kinds of polycrystalline systems (Pr 1-x Y x )Ba 2 Cu 3 O 7 and Ag-doped PrBa 2 Cu 3 O 7 , each of which exhibits percolative behaviour at a certain doping level. At room temperature, Jonker plots of the thermoelectric power against logarithm of the conductivity in both systems show a similar tendency that two different fitting lines are intercrossed at the percolation thresholds. The ρ(T) behaviour below 100 K in each system with low dopant content obeys the variable-range-hopping conduction. Variations of S(T) in both systems could be reconciled with the Boson -Fermion theory based on the resonating-valence-bond model with reasonable dependences of fitting parameters upon doping.

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The electron transport phenomena in Y based HTSC's and their analysis on the basis of phenomenological narrow-band theory the band structure transformation with oxygen content and substitution for Cu

Cited by 100 publications

References 38 publications

Thermoelectric power and resistivity in Nd2−Ce CuO4 system

Thermoelectric power and resistivity in Nd2−Ce CuO4 system

Thermodynamics of the movable oxygen and conducting properties of the solid solution YBa2Cu3-xCoxO6+δ at high temperatures

A comparative study of thermoelectric properties in (Pr,Y)Ba₂Cu₃O₇ and PrBa₂Cu₃O₇–Ag percolative systems

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The electron transport phenomena in Y based HTSC's and their analysis on the basis of phenomenological narrow-band theory the band structure transformation with oxygen content and substitution for Cu

Cited by 100 publications

References 38 publications

Thermoelectric power and resistivity in Nd2−Ce CuO4 system

Thermoelectric power and resistivity in Nd2−Ce CuO4 system

Thermodynamics of the movable oxygen and conducting properties of the solid solution YBa2Cu3-xCoxO6+δ at high temperatures

A comparative study of thermoelectric properties in (Pr,Y)Ba2Cu3O7 and PrBa2Cu3O7–Ag percolative systems

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A comparative study of thermoelectric properties in (Pr,Y)Ba₂Cu₃O₇ and PrBa₂Cu₃O₇–Ag percolative systems