PubMed期刊
期刊
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作者:Yildirim T
来源:[J].Physical Review Letters(IF 7.943), 2009, Vol.102 (3), pp.037003PubMed
摘要:From first-principles calculations, we unravel surprisingly strong interactions between arsenic ions in iron pnictides, the strength of which is controlled by the Fe-spin state. Reducing the Fe-magnetic moment weakens the Fe-As bonding, and in turn, increases As-As interactions, ...
作者:Yildirim T
来源:[J].Physical Review Letters(IF 7.943), 2008, Vol.101 (5), pp.057010PubMed
摘要:From all-electron fixed-spin-moment calculations we show that ferromagnetic and checkerboard antiferromagnetic ordering in LaFeAsO are not stable and the stripe antiferromagnetic configuration with M(Fe)=0.48 microB is the only stable ground state. The main exchange interactions ...
作者:Yildirim T , Ciraci S
来源:[J].Physical Review Letters(IF 7.943), 2005, Vol.94 (17), pp.175501PubMed
摘要:We report a first-principles study, which demonstrates that a single Ti atom coated on a single-walled nanotube (SWNT) binds up to four hydrogen molecules. The first H2 adsorption is dissociative with no energy barrier while the other three adsorptions are molecular with signific...
作者:Yildirim T , Hartman M R
来源:[J].Physical Review Letters(IF 7.943), 2005, Vol.95 (21), pp.215504PubMed
摘要:The hydrogen adsorption sites in MOF5 were determined using neutron powder diffraction along with first-principles calculations. The metal-oxide cluster is primarily responsible for the adsorption while the organic linker plays only a secondary role. Equally important, at low tem...
作者:Yildirim T , Ceyhanli K T
来源:[J].International Endodontic Journal, 2011, Vol.44 (6), pp.505-9PubMed
摘要:To compare the efficacy of several techniques for the removal of calcium hydroxide (Ca(OH)(2)) from root canals.;;The root canals of 24 freshly extracted human mandibular premolars were prepared with ProTaper rotary instruments. The teeth were sectioned longitudinally along the l...
作者:... Er K , Yildirim T , Celik D
来源:[J].International Endodontic Journal(IF 2.051), 2007, Vol.41 (3), pp.191-6PubMed
摘要:To investigate the ability of three rotary nickel-titanium instruments and hand instrumentation to remove gutta-percha and sealer.;;Sixty freshly extracted human single-rooted teeth, each with one root canal, were instrumented with K-files and filled using cold lateral compa...
作者:Yildirim T , Garip Y ...
来源:[J].International Endodontic Journal, 2008, Vol.41 (10), pp.836-42PubMed
摘要:To determine the quality of root fillings in teeth with artificial internal resorptive cavities filled with Thermafil, JS Quick-Fill, Soft Core, System B and Microseal, and by cold lateral compaction (LC) technique.;;Sixty maxillary incisor teeth were selected. After access cavit...
作者:Yildirim T , Nojiri H ...
来源:[J].Physical Review Letters(IF 7.943), 2008, Vol.101 (10), pp.107201PubMed
摘要:We report bulk magnetization, and elastic and inelastic neutron scattering measurements under an external magnetic field H on the weakly coupled distorted kagome system, Cu2(OD)3Cl. Our results show that the ordered state below 6.7 K is a canted antiferromagnet and consists of la...
作者:Yildirim T , Simmons J M ...
来源:[J].Physical Review Letters(IF 7.943), 2008, Vol.101 (25), pp.257002PubMed
摘要:The transition temperature T{C} approximately 26 K of the recently discovered superconductor LaFeAsO1-xFx is extremely sensitive to the lanthanide ion, reaching 55 K for the Sm containing oxypnictides. Therefore, it is important to determine how the moment on the lanthanide affec...

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