Iron-based superconductors research

A free web page under the name MAGNDATA , which provides detailed quantitative information on more than 400 published magnetic structures, has been developed and is available at the Bilbao Crystallographic Server (http://www.cryst.ehu.es). It includes both commensurate and incommensurate structures. This first article…

• EMRE TAŞCI

We report the results of a systematic investigation of the phase diagram of the iron-based superconductor Ba${}_{1\ensuremath{-}x}$K${}_{x}$Fe${}_{2}$As${}_{2}$ from $x$ $=$ 0 to $x$ $=$ 1.0 using high-resolution neutron and x-ray diffraction and magnetization measurements. The polycrystalline samples were prepared wi…

• SEVDA ŞAHİNBAY

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

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• SEVDA ŞAHİNBAY

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…

Superconductivity in iron selenides has experienced a rapid growth, but not without major inconsistencies in the reported properties. For alkali-intercalated iron selenides, even the structure of the superconducting phase is a subject of debate, in part because the onset of superconductivity is affected much more deli…

• SEVDA ŞAHİNBAY

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• ÖZLEM BİLGİLİ

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

Iron selenide (FeSex) crystals with lateral dimensions up to millimeters were grown via a vapor self-transport method. The crystals consist of the dominant α-phase with trace amounts of β-phase as identified by powder x-ray diffraction. With four-probe resistance measurements, we obtained a zero resistance critical te…

• SEVDA ŞAHİNBAY