Upper critical field H c2 in anisotropic superconductors with varying charge carrier density: Application of the theory to doped MgB2

Palistrant, M. E.; Chebotar, I. D.; Ursu, V. A.

doi:10.1134/s106377610908007x

Cited by 2 publications

(5 citation statements)

References 17 publications

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“…The technique of calculations of this sort is given in Appendix A. In this way, we obtain (see [31]) , which corresponds to the trimming of the integrals in the impulse space by definition of the parameters ij [26,36].…”

Section:  Directed Parallel To the (Ab) Planementioning

confidence: 99%

“…In this work, the results are presented briefly and concisely, they allow understanding the overall picture of occurring processes. For more details of this problem, in addition to [9], see [27] and [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…The technique of calculations of this sort is given in Appendix A. In this way, we obtain (see [31] , which corresponds to the trimming of the integrals in the impulse space by definition of the parameters ij [26,36]. If the interband interaction is neglected, what can be done when 11 , 22 >> 12 , 21 , then on the basis of (3.9) and (3.10) we shall obtain two independent equations, from which it follows that, at 0  , * 1 (x) does not depend on the magnetic field value.…”

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confidence: 99%

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The Upper Critical Field H c2 in Advanced Superconductors with Anisotropic Energy Spectrum

Palistrant

2010

J Supercond Nov Magn

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A brief review of works on the microscopic theory of determining the upper critical field in twoband isotropic and anisotropic superconductors is given. The research is based on a set of the Ginzburg-Landau equations for the order parameters in a magnetic field that are studied in terms of the classical approach to a superconducting system in a magnetic field. Two inequivalent energy bands with different topology of Fermi surface cavities overlapping on the Fermi surface are discussed. The cases of the direction of the external magnetic field // the (ab) plane and // the crystallographic c axis are studied. The equations for determining H c2 (ab) and H c2 (c) for a pure superconductor and a superconductor doped with electrons and holes are derived. The analytical solutions to these equations in the vicinity of the superconducting transition temperature (T c -T<

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Section:  Directed Parallel To the (Ab) Planementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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The Upper Critical Field H c2 in Advanced Superconductors with Anisotropic Energy Spectrum

Palistrant

2010

J Supercond Nov Magn

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“…If we use the values of λ nm , v 1 , v 2 and other theory parameters from [19] and [20] in order to compare this theoretical approach with experiments on MgB 2 , we will obtain a qualitative agreement between them [32][33][34][35][36]; this can be explained, in particular, by inexact determination of the theory parameters (the spread of these values in the literature is quite substantial). In this work we transform the expressions for H c2 (ab) and H c2 (c) in the studied temperature range introducing coefficients at all temperature dependent terms (see, e.g., (21)).…”

Section: Calculation Of the Temperature Dependence Of The Upper Critimentioning

confidence: 98%

“…Note that technique [29] contains two main parts: the execution, if possible, of all operations on the right-hand side of Eq. (4) (for details see [36], Appendix A) and the execution of a number of mathematical transformations in terms of the microscopic theory of superconductivity [34][35][36]. In this way, set of Eq.…”

Section: Calculation Of the Temperature Dependence Of The Upper Critimentioning

confidence: 99%

Analytical solutions of the microscopic two-band theory for the temperature dependence of the upper critical fields of pure MgB2 compared with experimental data

Palistrant

Surdu

Ursu

et al. 2011

Low Temperature Physics

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Main theoretical results of the microscopic two-band theory for the temperature dependence of the upper critical fields H c2 (ab) and H c2 (c) in pure two-band systems like MgB 2 are presented. The analytical solutions for the upper critical fields near the superconducting transition temperature and near the zero temperature were transformed to be directly compared with experimental data. The experimental H c2 (ab) and H c2 (c) temperature dependences of textured MgB 2 films near the superconducting transition temperature were measured and compared with the respective theoretical formulas. The results of this theoretical approach were also compared with earlier published experimental data of other authors. The chosen method allows obtaining an accurate match between the theoretical expressions and experimental results.PACS: 74.20.-z Theories and models of superconducting state.

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Upper critical field H c2 in anisotropic superconductors with varying charge carrier density: Application of the theory to doped MgB2

Cited by 2 publications

References 17 publications

The Upper Critical Field H c2 in Advanced Superconductors with Anisotropic Energy Spectrum

The Upper Critical Field H c2 in Advanced Superconductors with Anisotropic Energy Spectrum

Analytical solutions of the microscopic two-band theory for the temperature dependence of the upper critical fields of pure MgB2 compared with experimental data

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