Rare-earth and actinide compounds

Just as Invar describes a system with a smaller than ``normal'' thermal expansion in a magnetically ordered state, a system with a larger than ``normal'' thermal expansion in a magnetically disordered state can be described as anti-Invar. Anti-Invar had been already observed in a number of fcc binary and ternary alloy…

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…

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• ENGİN DELİGÖZ
• GÖKHAN SÜRÜCÜ

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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• HACI ÖZIŞIK

The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons we…

• MEHMET BEKTAŞOĞLU

The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons we…

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

We have investigated the thermal equation of state of bcc tantalum from first principles using the full-potential linearized augmented plane wave (LAPW) and mixed-basis pseudopotential methods for pressures up to 300 GPa and temperatures up to 10 000 K. The equation of state at zero temperature was computed using LAPW…

We complement our study on the doping and disorder in Co2MnZ compounds [I. Galanakis, K. Özdoğan, B. Aktaş, and E. Şaşıoğlu, Appl. Phys. Lett. 89, 042502 (2006) and K. Özdoğan, E. Şaşıoğlu, B. Aktaş, and I. Galanakis, Phys. Rev. B 74, 172412 (2006)] to cover also the quaternary Co2[Y1−xYx∗]Z compounds with the lower-v…

We complement our study on the doping and disorder in Co2MnZ compounds [I. Galanakis, K. Özdoğan, B. Aktaş, and E. Şaşıoğlu, Appl. Phys. Lett. 89, 042502 (2006) and K. Özdoğan, E. Şaşıoğlu, B. Aktaş, and I. Galanakis, Phys. Rev. B 74, 172412 (2006)] to cover also the quaternary Co2[Y1−xYx∗]Z compounds with the lower-v…

• KEMAL ÖZDOĞAN

We report a high resolution neutron diffraction investigation of the coupling of structural and magnetic transitions in Ba${}_{1\ensuremath{-}x}$K${}_{x}$Fe${}_{2}$As${}_{2}$. The tetragonal-orthorhombic and antiferromagnetic transitions are suppressed with potassium doping, falling to zero at $x\ensuremath{\lesssim}0…

• SEVDA ŞAHİNBAY