Papers by Heshmatollah Yavari
Japanese Journal of Applied Physics, 1987
We examine effects of magnetic and non-magnetic impurities on superconductors with anisotropic Co... more We examine effects of magnetic and non-magnetic impurities on superconductors with anisotropic Cooper pairs of spin-singlet and calculate the tunneling density of states. When the Cooper pair has no component with s-symmetry, magnetic impurities result in the same pair-breaking effect as non-magnetic ones, which is weaker than the usual time-reversal symmetry breaking. The recently discovered high T c magnetic superconducting oxides, R-Ba-Cu-O with R being rare-earth ions, are discussed in the light of the present theory.
Iranian Journal of Physics Research, 2009
كچ ي هد هدافتسا اب تسخن م ناشن نيرگ عبات شور زا ي م شنک مهرب هک ميهد ؤ طساو هب نورتکلا ود نيب رث ... more كچ ي هد هدافتسا اب تسخن م ناشن نيرگ عبات شور زا ي م شنک مهرب هک ميهد ؤ طساو هب نورتکلا ود نيب رث ة نومسلاپ لدابت م ي ياناسرربا تلاح داجيا بجوم هک دشاب بذاج دناوت ي امد اب ي هلول ونان رد لااب راذگ اه ي نبرک ي م هراويد کت ي ددرگ . امد ي رجت جياتن اب راکوزاس نيا نتفرگ رظن رد اب هدما تسد هب راذگ ب ي تـسا قفاوت رد . اـب هـک داد ميهاوـخ ناشـن نيـنچمه م شهاک نومسلاپ دماسب هلولونان عاعش شيازفا ي امد شهاک هب رجنم هک دباي ي م راذگ ي ددرگ .
Journal of Low Temperature Physics, 2014
ABSTRACT
Journal of Superconductivity and Novel Magnetism, 2016
Low-temperature dependence of the shear viscosity components in superconductor Sr2RuO4 is investi... more Low-temperature dependence of the shear viscosity components in superconductor Sr2RuO4 is investigated within the framework of the Boltzmann equation. We will show that this dissipative viscosity has a power-law temperature dependence as T2 for the γ band of the Fermi surface with the isotropic gap. Lupien et al. experimentally found that the shear viscosity components of superconductor Sr2RuO4 change as T1.8 at low temperatures. This relative consistency between the temperature dependence for the isotropic gap and experimental results implies that the gap node of Sr2RuO4 may be a horizontal line node.
Journal of the Optical Society of America B, 2015
Solid State Communications, 2012
Solid State Communications, 2010
The spin–lattice relaxation rate of nuclear magnetic resonance (NMR) in a superconductor without ... more The spin–lattice relaxation rate of nuclear magnetic resonance (NMR) in a superconductor without inversion symmetry by considering a Cooper pairing model with a two-component order parameter composed of spin–singlet and spin–triplet pairing components in the presence of impurity effect is investigated. By using the Green’s function method and linear response theory we calculate the appropriate correlation function to evaluate the
Solid State Communications, 2011
The shear viscosity of spin-polarized Fermi gas at low temperatures is calculated by using the Gr... more The shear viscosity of spin-polarized Fermi gas at low temperatures is calculated by using the Green’s functions method. In the BEC limit where a Feshbach resonance gives rise to tightly bound dimer molecules, the contributions of the interactions between dimer–atom and imer–dimer take into account to the viscous relaxation rate.
Physica B: Condensed Matter, 2011
Using the Kubo formula approach and Green's function method, the temperature dependence of th... more Using the Kubo formula approach and Green's function method, the temperature dependence of the transmittance and effective surface resistance of high quality MgB2 film are calculated in the framework of the two-band model. For large interval of temperatures below TC our results are in agreement with experimental data. We show a single-gap model based on BCS theory, which is insufficient
Journal of Low Temperature Physics, 2013
ABSTRACT
Journal of Applied Physics, 2014
The effects of impurity and Bose-Fermi interactions on the transition temperature of a dipolar Bo... more The effects of impurity and Bose-Fermi interactions on the transition temperature of a dipolar Bose–Einstein condensation in trapped Bose-Fermi mixture, by using the two-fluid model, are investigated. The shift of the transition temperature consists of four contributions due to contact, Bose-Fermi, dipole-dipole, and impurity interactions. We will show that in the presence of an anisotropic trap, the Bose-Fermi correction to the shift of transition temperature due to the excitation spectra of the thermal part is independent of anisotropy factor. Applying our results to trapped Bose-Fermi mixtures shows that, by knowing the impurity effect, the shift of the transition temperature due to Bose-Fermi interaction could be measured for isotropic trap (dipole-dipole contributions is zero) and Feshbach resonance technique (contact potential contribution is negligible).
Physica B: Condensed Matter, 2010
Superconductor Science and Technology, 2020
Low Temperature Physics, 2016
Physica C: Superconductivity, 2010
The magnetic penetration depth of a superconductor without inversion symmetry by considering a Co... more The magnetic penetration depth of a superconductor without inversion symmetry by considering a Cooper pairing model with a two-component order parameter composed of spin-singlet and spin-triplet pairing components in the presence of nonlineary, nonlocality, and impurity effects is investigated. By using Green’s function method and linear response theory we calculate the appropriate correlation function to evaluate the magnetic penetration depth.For
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Papers by Heshmatollah Yavari