A T(c) formula and the isotope effect for strong-coupled superconductors

Date

1994-01-01

Author

Tüblek, Aytekin
Yurtseven, Hasan Hamit

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In this study we obtain analytically the transition temperature T(c) which is similar to the one due to Allen and Dynes, and the isotope effect. Using the Eliashberg theory that includes both the electron-electron and electron-phonon interactions in superconductors, we calculate the transition temperature T(c) and the coefficient alpha of the isotope effect for a group of superconductors under study.

Subject Keywords

Instrumentation, General Materials Science

URI

https://hdl.handle.net/11511/57344

Journal

PHASE TRANSITIONS

DOI

https://doi.org/10.1080/01411599408200376

Collections

Department of Physics, Article

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T-X-Br phase diagram for the NH4BrxCl1-x system Tari, O; Yurtseven, Hasan Hamit; Salihoglu, S (Informa UK Limited, 2000-01-01) In this study using a mean field model we calculate the phase line equations for the beta-delta, beta-gamma and gamma-delta phase transitions in the NH4BrxCl1-x system. We then fit our phase line equations to the experimentally observed T-X-Br phase diagram for this system. Our calculated phase diagram agrees well with the observed one for the NH4BrxCl1-x system.
The lambda-phase transition in NH4Br Yurtseven, Hasan Hamit; Sherman, WF (Informa UK Limited, 1996-01-01) This study gives the predicted frequencies for the Raman modes of v(7)TA(56 cm(-1)), v(5)LO(177 cm(-1)) and v(2)(1684 cm(-1)) of NH4Br at various temperatures for zero pressure across the lambda-phase transition in this crystal system. We calculate the Raman frequencies by means of a constant mode Gruneisen parameter for each mode across the lambda-phase change region of NH4Br.
A phase diagram near the NAC* point in liquid crystals Salihoglu, S; Tublek, A; Yurtseven, Hasan Hamit (Informa UK Limited, 2000-01-01) Wt study here a mean field model to obtain the phase diagram (concentration versus temperature) near the NAC* point in a binary mixture of liquid crystal. Wr have Fitted our phase line equations to the experimental data for the mixture of SCE9 + SCE10 liquid crystals. We deduce fi om our analysis that there should exist a tricritical point close to the NAC* point on the AC* phase line.
A phase diagram for ammonium halides Yurtseven, Hasan Hamit; Tublek, A (Informa UK Limited, 1995-01-01) In this study we have developed a mean field model to obtain the phase diagrams for NH4Cl and NH4Br. The phase diagrams obtained from our macroscopic theory are in good agreement with those obtained experimentally.
The mean field model with P-2 theta(2) coupling for the smectic A-smectic C* phase transition in liquid crystals Salihoglu, S; Yurtseven, Hasan Hamit; Giz, A; Kayisoglu, D; Konu, A (Informa UK Limited, 1998-01-01) Using mean field theory with a P(2)theta (2) coupling term in the free energy expansion, we calculate the polarization as a function of temperature for the smectic A-smectic C* phase transition in a liquid crystalline material. Our calculated polarization values are in good agreement with the experimental data.

Citation Formats

A. Tüblek and H. H. Yurtseven, “A T(c) formula and the isotope effect for strong-coupled superconductors,” PHASE TRANSITIONS, pp. 219–225, 1994, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57344.