Superconductivity in MgB2 and Alloys

First-principles calculations of the electronic band structure and lattice dynamics for the new superconductor MgB (2) are carried out and found to be in excellent agreement with our inelastic neutron scattering measurements. The numerical results reveal that the E(2g) in-plane boron phonons near the zone center are v…

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• LÜTFİ ÖZYÜZER

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The structural, mechanical, and electronic properties of ${\text{MnB}}_{2}$, ${\text{TcB}}_{2}$, and ${\text{ReB}}_{2}$ have been studied by performing first-principles calculations at the level plane-wave basis pseudopotential formalism in both aluminum diboride- and rhenium diboride-type structures. The results of l…

• SEZGİN AYDIN

Persistent current joints are crucial components of superconducting magnets—enabling the production of the high and ultra-stable magnetic fields required, for instance, for magnetic resonance measurements. At this critical juncture when persistent mode magnets containing commercial high temperature superconductors may…

Charge-density-wave (CDW) correlations within the quintessential CuO$_2$ planes have been argued to either cause [1] or compete with [2] the superconductivity in the cuprates, and they might furthermore drive the Fermi-surface reconstruction in high magnetic fields implied by quantum oscillation (QO) experiments for Y…

We study the temperature dependence of the upper critical field H c2 ( T ) for superconducting magnesium diboride, MgB 2 in the vicinity of T c using a two-band Ginzburg-Landau (G-L) theory. The temperature dependence of H c2 ( T ) near T c exhibits a positive curvature. In addition, the calculated temperature depende…

• NUSRET GÜÇLÜ

We study the temperature dependence of the upper critical field H c2 ( T ) for superconducting magnesium diboride, MgB 2 in the vicinity of T c using a two-band Ginzburg-Landau (G-L) theory. The temperature dependence of H c2 ( T ) near T c exhibits a positive curvature. In addition, the calculated temperature depende…

• ALİ GENÇER

We have investigated the thermoelasticity of body-centered-cubic (bcc) tantalum from first principles by using the linearized augmented plane wave and mixed-basis pseudopotential methods for pressures up to 400 GPa and temperatures up to 10 000 K. Electronic excitation contributions to the free energy were included fr…

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• ÖZLEM BİLGİLİ

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• ÇETİN ÇAKANYILDIRIM

An important question is, if the gap in the high-temperature cuprates has ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ symmetry, what does that tell us about the underlying interaction responsible for pairing? Here we explore this by determining how three different types of electron-phonon interactions affect the ${d}_{{x}^{2…

• NEJAT BULUT