Ni-impurity effects on the superconducting gap of La2−xSrxCuO4studied from the magnetic field and temperature dependence of the electronic specific heat

The article considers the oscillations of interband magneto-optical absorption in semiconductors with the Kane dispersion law. We have compared the changes in oscillations of the joint density of states with respect to the photon energy for different Landau levels in parabolic and non-parabolic zones. An analytical expression is obtained for the oscillation of the combined density of states in narrow-gap semiconductors. We have calculated the dependence of the maximum photon energy on the magnetic field at different temperatures. A theoretical study of the band structure showed that the magnetoabsorption oscillations decrease with an increase in temperature, and the photon energies nonlinearly depend on a strong magnetic field. The article proposes a simple method for calculating the oscillation of joint density of states in a quantizing magnetic field with the non-quadratic dispersion law. The temperature dependence of the oscillations joint density of states in semiconductors with non-parabolic dispersion law is obtained. Moreover, the article studies the temperature dependence of the band gap in a strong magnetic field with the non-quadratic dispersion law. The method is applied to the research of the magnetic absorption in narrow-gap semiconductors with nonparabolic dispersion law. It is shown that as the temperature increases, Landau levels are washed away due to thermal broadening and density of states turns into a density of states without a magnetic field. Using the mathematical model, the temperature dependence of the density distribution of energy states in strong magnetic fields is considered. It is shown that the continuous spectrum of the density of states, measured at the temperature of liquid nitrogen, at low temperatures turns into discrete Landau levels. Mathematical modeling of processes using experimental values of the continuous spectrum of the density of states makes it possible to calculate discrete Landau levels. We have created the three-dimensional fan chart of magneto optical oscillations of semiconductors with considering for the joint density of energy states. For a nonquadratic dispersion law, the maximum frequency of the absorbed light and the width of the forbidden band are shown to depend nonlinearly on the magnetic field. Modeling the temperature dependence allowed us to determine the Landau levels in semiconductors in a wide temperature spectrum. Using the proposed model, the experimental results obtained for narrow-gap semiconductors are analyzed. The theoretical results are compared with experimental results.

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Temperature dependence of the magnetic-field-induced strain of NiMnGa in the presence of an acoustic drive

Journal of Applied Physics ◽

10.1063/1.2824895 ◽

2008 ◽

Vol 104 (3) ◽

pp. 033918 ◽

Cited By ~ 9

Author(s):

Bradley W. Peterson ◽

Samuel M. Allen ◽

Robert C. O’Handley

Keyword(s):

Magnetic Field ◽

Temperature Dependence ◽

The Magnetic Field

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The magnetic field dependence of the low temperature (0.1K to 3K) residual specific heat of Pr2−x Ce x CuO4−δ

Czechoslovak Journal of Physics ◽

10.1007/bf02562721 ◽

1996 ◽

Vol 46 (S3) ◽

pp. 1213-1214 ◽

Cited By ~ 4

Author(s):

T. E. Hargreaves ◽

J. Akimitsu ◽

D. F. Brewer ◽

N. E. Hussey ◽

H. Noma ◽

...

Keyword(s):

Magnetic Field ◽

Low Temperature ◽

Specific Heat ◽

Field Dependence ◽

Magnetic Field Dependence ◽

The Magnetic Field

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Magnetic-field and temperature dependence of the superconducting gap through current-density functional theory for superconductors

Physical Review B ◽

10.1103/physrevb.102.014515 ◽

2020 ◽

Vol 102 (1) ◽

Author(s):

Katsuhiko Higuchi ◽

Naoki Matsumoto ◽

Yuki Kamijo ◽

Masahiko Higuchi

Keyword(s):

Magnetic Field ◽

Density Functional Theory ◽

Temperature Dependence ◽

Current Density ◽

Density Functional ◽

Superconducting Gap ◽

Functional Theory

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Effect of temperature on magnetic susceptibility and thermodynamic properties of an asymmetric quantum dot in tilted magnetic field

Modern Physics Letters B ◽

10.1142/s0217984915501274 ◽

2015 ◽

Vol 29 (23) ◽

pp. 1550127 ◽

Cited By ~ 5

Author(s):

R. Khordad

Keyword(s):

Magnetic Field ◽

Magnetic Susceptibility ◽

Quantum Dot ◽

Specific Heat ◽

Energy Levels ◽

Effect Of Temperature ◽

Magnetic Field Direction ◽

Asymmetric Quantum ◽

Gaas Quantum Dot ◽

The Magnetic Field

In this paper, the specific heat, entropy and magnetic susceptibility of an asymmetric GaAs quantum dot (QD) are studied under the influence of temperature and a tilted external magnetic field. We first calculate the analytical wave functions and energy levels using a transformation to simplify the Hamiltonian of the system. Then, we obtain the analytical expressions for specific heat, entropy and magnetic susceptibility as the function of temperature, magnetic field and its direction for various anisotropy of the system. According to the results obtained from the present work, we find that (i) the specific heat and entropy are decreased when the magnetic field increases. (ii) When anisotropy is increased, the specific heat and entropy decrease. (iii) At large magnetic fields, the anisotropy has not important effect on specific heat and entropy. In briefly, the magnetic field, magnetic field direction and anisotropy play important roles in the specific heat, entropy and magnetic susceptibility of an asymmetric QD.

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