Iron-based superconductors research

New break-junction tunneling data are reported in ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ over a wide range of hole concentration from underdoped $({T}_{c}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}74\phantom{\rule{0ex}{0ex}}\mathrm{K})$ to optimal doped $({T…

• LÜTFİ ÖZYÜZER

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

Measurements of the de Haas--van Alphen effect in the normal state of the heavy-fermion superconductor ${\mathrm{CeCoIn}}_{5}$ have been carried out using a torque cantilever at temperatures ranging from 20 to 500 mK and in fields up to 18 T. Angular-dependent measurements of the extremal Fermi surface areas reveal a…

Monte Carlo results for a two-dimensional Hubbard model in the intermediate-coupling regime U=4t are compared with a diagrammatic spin-fluctuation approximation. Simulations on an 8\ifmmode\times\else\texttimes\fi{}8 lattice doped away from half filling were carried out down to temperatures of order 140 of the bandwid…

• NEJAT BULUT

The de Haas--van Alphen effect and energy-band calculations are used to study angular-dependent extremal areas and effective masses of the Fermi surface of the highly correlated antiferromagnetic material ${\mathrm{CeRhIn}}_{5}.$ The agreement between experiment and theory is reasonable for the areas measured with the…

• ÜMİT ALVER

The two-leg Hubbard ladder is characterized by the ratio of the inter- to intra-leg hopping ${t}_{\ensuremath{\perp}}/t$, the relative interaction strength $U/t,$ and the electron filling. Here, using density matrix renormalization group and Monte Carlo simulations, we examine the dependence of the pairing correlation…

• NEJAT BULUT

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• MURAT DURANDURDU

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• ÖZGÜR ÖZTÜRK

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• CABİR TERZİOĞLU
• ÖZGÜR ÖZTÜRK

The single phase clathrate-I Ba(8)Ge(43)square(3) (space group Ia3d (no. 230), a = 21.307(1) A) was synthesized by quenching the melt between cold steel plates. Specimens for physical property measurements were characterized by microstructure analysis and X-ray diffraction on polycrystalline samples as well as single…

Using first-principles calculations, we demonstrate that hexagonal monolayers of chromium pnictides $\mathrm{Cr}X (X\text{=P},\mathrm{As},\mathrm{Sb})$ are ferromagnetically ordered systems with the Curie temperature well above 300 K. All three systems are found to be dynamically stable, having no anomalies in the pho…

• AYBEY MOĞULKOÇ