Synthesis and crystal growth of Cs 0.8 (FeSe 0.98 ) 2 : a new iron-based superconductor with T c = 27 K
Anna Krztoń-Maziopa , Z Shermadini , E Pomjakushina , V Pomjakushin , M Bendele , A Amato , R Khasanov , H Luetkens , K Conder
AbstractWe report on the synthesis of large single crystals of a new FeSe layer superconductor Cs0.8(FeSe0.98)2. X-ray powder diffraction, neutron powder diffraction and magnetization measurements have been used to compare the crystal structure and the magnetic properties of Cs0.8(FeSe0.98)2 with those of the recently discovered potassium intercalated system KxFe2Se2. The new compound, Cs0.8(FeSe0.98)2, shows a slightly lower superconducting transition temperature (Tc = 27.4 K) in comparison to 29.5 in (K0.8(FeSe0.98)2). The volume of the crystal unit cell increases by replacing K by Cs—the c parameter grows from 14.1353(13) to 15.2846(11) Å. For the alkali metal intercalated layered compounds known so far, (K0.8Fe2Se2 and Cs0.8(FeSe0.98)2), the Tc dependence on the anion height (distance between Fe layers and Se layers) was found to be analogous to those reported for As-containing Fe superconductors and Fe(Se1 − xChx), where Ch = Te, S.
|Journal series||Journal of Physics-Condensed Matter, ISSN 0953-8984|
|Keywords in English||Superconductivity, Condensed matter: electrical, magnetic and optical, Condensed matter: structural, mechanical & thermal|
|Publication indicators||: 2011 = 2.546 (2) - 2011=2.18 (5)|
|Citation count*||262 (2015-11-27)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.