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Browning, V. M.; Skelton, E. F.; Osofsky, M. S.; Qadri, S. B.; Hu, Jing; Finger, L. W.; Caubet, P.

doi:10.1103/physrevb.56.2860

Cited by 24 publications

(17 citation statements)

References 64 publications

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“…Also, there is a problem of a genesis of structural inhomogeneities in a single crystal of the YBaCuO type observed by the experiments using Raman spectroscopy [16] and mesoscopic structural date [17]. Our results show the possibility of dielectric type mechanism of the appearance of the mentioned instabilities.…”

Section: Discussionmentioning

confidence: 60%

The Phase Separation Effects in a Pseudospin-Electron Model

Danyliv¹,

Stasyuk²

2002

Condens. Matter Phys.

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The two-sublattice pseudospin-electron model of high temperature superconductors is studied with respect to phase separations. Such a model can be used for the description of dielectric properties of YBaCuO-type crystals along c -axis (the pseudospins represent an anharmonic motions of apical oxygen O4). The model is treated within different approximations. It is shown that the model has got phase transitions to the phase with pseudospin ordering as well as phase separation. The effect of separation on the appearance of the ordered state is discussed.

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Section: Discussionmentioning

confidence: 60%

The Phase Separation Effects in a Pseudospin-Electron Model

Danyliv¹,

Stasyuk²

2002

Condens. Matter Phys.

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“…However, simple numerical calculations show that, e. g., for YBa 2 Cu 3 O 7−δ , the scaling does not work for fields H < 2 T. Therefore, we derive new, low-field approximation for conductivity from Eqs. (1) and (3). For h ≪ 1 one can replace summation for n ≥ 1 by integration using Euler-Maklaurin formula 21 and obtain the following analytical expressions for conductivity:…”

Section: Doniachmentioning

confidence: 99%

“…This approximation predicts transition at T = T c in contradiction to basic equations of UD model, Eqs. (1) and (3). In order to make the high-field approximation merge all other curves in Fig.…”

Section: Doniachmentioning

confidence: 99%

“…Meanwhile, experimental x-ray data show that δ variation can be substantially higher even for crystals exhibiting excellent transport properties. 3 Another origin of T c -inhomogeneity is variation in cation (Y, Ba, Cu) composition. This origin can be dominant in thin YBCO films, as shown by simultaneous spatially resolved studies of cation composition and T c using electron probe microanalysis and low-temperature scanning electron microscopy (LTSEM), respectively.…”

Section: Introductionmentioning

confidence: 99%

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Temperature and magnetic-field dependence of the conductivity ofYBa2Cu3O
Shantsev
¹
,
Gaevski
²
,
Suris
³

et al. 1999
Phys. Rev. B
7
0
7
0
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Temperature and magnetic-field dependence of the conductivity of YBa 2 Cu 3 O 7−δ films in the vicinity of superconducting transition: Effect of T C -inhomogeneity Temperature and magnetic field dependences of the conductivity of YBa2Cu3O 7−δ films in the transition region are analyzed taking into account spatial inhomogeneity in transition temperature, Tc. (i) An expression for the superconducting contribution to conductivity, σs(T, H, Tc), of a homogeneous superconductor for low magnetic fields, H ≪ Hc2 (0) (ii) The error in σs(T, H, Tc) occurring due to the presence of Tc-inhomogeneity is calculated and plotted on an H − T plane diagram. These calculations use an effective medium approximation and a Gaussian distribution of Tc. (iii) Measuring the temperature dependences of a voltage, induced by a focused electron beam, we determine spatial distributions of the critical temperature for YBa2Cu3O 7−δ microbridges with a 2 µm resolution. A typical Tc-distribution dispersion is found to be ≈1 K. For such dispersion, error in σs(T, H, Tc) due to Tc-inhomogeneity exceeds 30% for magnetic fields H < 1 T and temperatures |T − Tc| < 0.5 K . (iv) Experimental R(T, H) dependences of resistance are well described by a numerical solution of a set of Kirchoff equations for the resistor network based on the measured spatial distributions of Tc and the expression for σs(T, H, Tc).

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“…It should be mentioned in this connection that the problem of the genesis of structural inhomogeneities (which is manifest, for example, in the Raman scattering spectra [8,9] or mesoscopic structural data [31]) in single crystals of the YBa 2 Cu 3 O 7−δ type has become urgent in the last years. This situation opens up new possibilities for the application of locally anharmonic models of HTSC systems.…”

Section: Introductionmentioning

confidence: 99%

LOCAL ANHARMONIC EFFECTS IN HIGH-T_c SUPERCONDUCTORS. PSEUDOSPIN-ELECTRON MODEL

Stasyuk¹

1999

Condens. Matter Phys.

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Some aspects of physical phenomena in high-T c crystals caused by anharmonicity of the crystal lattice are discussed. Appropriate theoretical models are considered. A review is given of the results obtained while investigating the pseudospin-electron model (PEM) when applied to the description of structural and dielectric instabilities, phase separations and bistability phenomena. The theoretical problems are analyzed arising in PEM when the strong short-range correlations and electron transfer are taken into account simultaneously.

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Structural inhomogeneities observed inYBa2Cu3O7

Cited by 24 publications

References 64 publications

The Phase Separation Effects in a Pseudospin-Electron Model

The Phase Separation Effects in a Pseudospin-Electron Model

Temperature and magnetic-field dependence of the conductivity ofYBa2Cu3O
Shantsev
¹
,
Gaevski
²
,
Suris
³

et al. 1999
Phys. Rev. B
7
0
7
0
View full text Add to dashboard Cite

LOCAL ANHARMONIC EFFECTS IN HIGH-T_c SUPERCONDUCTORS. PSEUDOSPIN-ELECTRON MODEL

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Structural inhomogeneities observed inYBa2Cu3O7

Cited by 24 publications

References 64 publications

The Phase Separation Effects in a Pseudospin-Electron Model

The Phase Separation Effects in a Pseudospin-Electron Model

Temperature and magnetic-field dependence of the conductivity ofYBa2Cu3OShantsev1, Gaevski2, Suris3 et al. 1999Phys. Rev. B7070View full textAdd to dashboardCite

LOCAL ANHARMONIC EFFECTS IN HIGH-T_c SUPERCONDUCTORS. PSEUDOSPIN-ELECTRON MODEL

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Product

Resources

About

Temperature and magnetic-field dependence of the conductivity ofYBa2Cu3O
Shantsev
¹
,
Gaevski
²
,
Suris
³

et al. 1999
Phys. Rev. B
7
0
7
0
View full text Add to dashboard Cite