Superconductivity and magnetism in Rb x Fe 2 − y Se 2 : Impact of thermal treatment on mesoscopic phase separation

  title={Superconductivity and magnetism in Rb x Fe 2 − y Se 2 : Impact of thermal treatment on mesoscopic phase separation},
  author={Stephen Weyeneth and Markus Bendele and Fabian O. von Rohr and P. Dluzewski and Roman Puźniak and Anna Krztoń-Maziopa and Saskia Bosma and Zurab Guguchia and Rustem Khasanov and Zurab Shermadini and A. Amato and Ekaterina Pomjakushina and Kazimierz Conder and Andreas Schilling and Hugo Keller},
  journal={Physical Review B},
An extended study of the superconducting and normal-state properties of various as-grown and post-annealed Rb${}_{x}$Fe${}_{2\ensuremath{-}y}$Se${}_{2}$ single crystals is presented. Magnetization experiments evidence that annealing of Rb${}_{x}$Fe${}_{2\ensuremath{-}y}$Se${}_{2}$ at 413 K, well below the onset of phase separation ${T}_{\mathrm{p}}\ensuremath{\simeq}489$ K, neither changes the magnetic nor the superconducting properties of the crystals. In addition, annealing at 563 K, well… 

Molecular beam epitaxy of electron-doped infinite-layer Ca1−xRxCuO2 thin films

Infinite-layer CaCuO${}_{2}$ is an isolated essential block of high-temperature superconducting cuprates while superconductivity in this phase remains elusive. Using molecular beam epitaxy equipped

Three dimensional spider-web-like superconducting filamentary paths in $K_xFe_{2-y}Se_2$ single crystals

Since the discovery of high temperature superconductivity in F-doped LaFeAsO (ref.1), many new iron based superconductors with different structures have been fabricated 2 . The observation of

High-resolution characterization of microstructural evolution inRbxFe2−ySe2crystals on annealing

The superconducting and magnetic properties of phase-separated A$_x$Fe$_{2-y}$Se$_2$ compounds are known to depend on post-growth heat treatments and cooling profiles. This paper focusses on the

Phase separation in iron chalcogenide superconductor Rb0.8+xFe1.6+ySe2 as seen by Raman light scattering and band structure calculations

We report Raman light scattering in the phase separated superconducting single crystal Rb0.77Fe1.61Se2 with Tc = 32 K over a wide temperature region 3–500 K. The observed phonon lines from the

Superconductivity in alkali metal intercalated iron selenides

The present paper reviews scientific work concerning methods of synthesis and crystal growth, structural and superconducting properties as well as pressure investigations, and assumes the iron vacancy ordering, linked with a long-range magnetic order and a mesoscopic phase separation, to be an intrinsic property of the system.

Annealing effects on superconductivity in Rb0.81Fe1.72Se2 single crystal

The annealing effects on superconductivity in Rb0.81Fe1.72Se2 are investigated. For as-grown single crystal and the one annealed with furnace cooling, magnetic susceptibility exhibits a weak

Structure, superconductivity, and magnetism in Rb1−xFe1.6Se2−zSz

The single-crystal growth, stoichiometry, and structure of Rb1-xFe2-ySe2-zSz crystals with substitution of Se by S are reported. The variation of the magnetic and thermodynamic parameters of samples

High-Pressure Single-Crystal Neutron Scattering Study of Magnetic and Fe Vacancy Orders in (Tl,Rb)2Fe4Se5 Superconductor

The magnetic and iron vacancy orders in superconducting (Tl,Rb)2Fe4Se5 single-crystals are investigated by using a high-pressure neutron diffraction technique. Similar to the temperature effect, the

Influence of microstructure on superconductivity in KxFe2−ySe2 and evidence for a new parent phase K2Fe7Se8

A three-dimensional network ofsuperconducting filaments are identified that provide clues to the structure of the parent phase of superconductivity of iron-based superconductor KxFe2−ySe2 and it is suggested that the superconducting phase consists of a single Fe vacancy for every eight Fe-sites arranged in a √8 x √10 parallelogram structure.

Effect of electron count and chemical complexity in the Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor

It is shown that the valence electron count dependence of the superconducting transition temperature in the high-entropy alloy falls between those of analogous simple solid solutions and amorphous materials and the effect of alloy complexity on the superconductor.



* Electronic address:

    La Sapienza"-P. le Aldo Moro 2, I-00185 Roma, Italy. ‡ On leave from Faculty of Chemistry

      35 V . Ambegaokar and A . Baratoff

      • Phys . Rev . Lett
      • 1966