Document Detail

Intrinsic crystal phase separation in the antiferromagnetic superconductor Rb(y)Fe(2-x)Se(2): a diffraction study.
MedLine Citation:
PMID:  23032696     Owner:  NLM     Status:  Publisher    
The crystal and magnetic structures of the superconducting iron-based chalcogenides Rb(y)Fe(2-x)Se(2) have been studied by means of single-crystal synchrotron x-ray and high-resolution neutron powder diffraction in the temperature range 2-570 K. The ground state of the crystal is an intrinsically phase-separated state with two distinct-by-symmetry phases. The main phase has the iron vacancy ordered [Formula: see text] superstructure (I4/m space group) with AFM ordered Fe spins. The minority phase does not have [Formula: see text]-type of ordering and has a smaller in-plane lattice constant a and larger tetragonal c-axis and can be well described by assuming the parent average vacancy disordered structure (I4/mmm space group) with the refined stoichiometry Rb(0.60(5))(Fe(1.10(5))Se)(2). The minority phase amounts to 8-10% mass fraction. The unit cell volume of the minority phase is 3.2% smaller than the one of the main phase at T = 2 K and has quite different temperature dependence. The minority phase merges with the main vacancy ordered phase on heating above the phase separation temperature T(P) = 475 K. The spatial dimensions of the phase domains strongly increase above T(P) from 1000 to >2500 Å due to the integration of the regions of the main phase that were separated by the second phase at low temperatures. Additional annealing of the crystals at a temperature T = 488 K, close to T(P), for a long time drastically reduces the amount of the minority phase.
V Yu Pomjakushin; A Krzton-Maziopa; E V Pomjakushina; K Conder; D Chernyshov; V Svitlyk; A Bosak
Related Documents :
24945906 - Solvation and protonation of coumarin 102 in aqueous media ‒ a fluorescence spectrosc...
25484726 - Crystal structures of the co-crystalline adduct 5-(4-bromo-phen-yl)-1,3,4-thia-diazol-2...
17302406 - Rare-earth metal-rich antimonides: syntheses, structures, and properties of tm(3)sb and...
25110896 - Fabrication of nickel-foam-supported layered zinc-cobalt hydroxide nanoflakes for high ...
16085086 - Modification of fibrous silicates surfaces with organic derivatives: an infrared spectr...
22590436 - Bis(cyclo-hexyl-ammonium) terephthalate.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-03
Journal Detail:
Title:  Journal of physics. Condensed matter : an Institute of Physics journal     Volume:  24     ISSN:  1361-648X     ISO Abbreviation:  J Phys Condens Matter     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101165248     Medline TA:  J Phys Condens Matter     Country:  -    
Other Details:
Languages:  ENG     Pagination:  435701     Citation Subset:  -    
Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Safety and efficacy of pralatrexate in the management of relapsed or refractory peripheral T-cell ly...
Next Document:  Reactive deposition of nano-films in deep polymeric microcavities.