Phase transition in CaFeAsH: bridging 1111 and 122 iron-based superconductors

Dalton Transactions : an International Journal of Inorganic Chemistry
Yoshinori MurabaHideo Hosono

Abstract

Iron-based superconductors can be categorized into two types of parent compounds by considering the nature of their temperature-induced phase transitions; namely, first order transitions for 122- and 11-type compounds and second-order transitions for 1111-type compounds. This work examines the structural and magnetic transitions (ST and MT) of CaFeAsH by specific heat, X-ray diffraction, neutron diffraction, and electrical resistivity measurements. Heat capacity measurements revealed a second-order phase transition that accompanies an apparent single peak at 96 K. However, a clear ST from the tetragonal to orthorhombic phase and an MT from the paramagnetic to the antiferromagnetic phase were detected. The structural (Ts) and Néel temperatures (TN) were respectively determined to be 95(2) and 96 K by X-ray and neutron diffraction and resistivity measurements. This small temperature difference, Ts-TN, was attributed to strong magnetic coupling in the inter-layer direction owing to CaFeAsH having the shortest lattice constant c among parent 1111-type iron arsenides. Considering that a first-order transition takes place in 11- and 122-type compounds with a short inter-layer distance, we conclude that the nature of the ST and MT in ...Continue Reading

References

Feb 26, 2008·Journal of the American Chemical Society·Yoichi KamiharaHideo Hosono
May 27, 2008·Nature·X H ChenD F Fang
Sep 4, 2008·Physical Review Letters·L BoeriA A Golubov
Sep 4, 2008·Physical Review Letters·H-H KlaussB Büchner
Oct 10, 2008·Journal of the American Chemical Society·Satoru MatsuishiHideo Hosono
Oct 15, 2008·Physical Review Letters·Marianne RotterDirk Johrendt
Feb 24, 2009·Nature Materials·H LuetkensB Büchner
Jan 15, 2011·Physical Review Letters·R M FernandesJ Schmalian
Mar 11, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Walter O UhoyaSamuel T Weir
Mar 17, 2011·Physical Review Letters·O J LipscombePengcheng Dai
Jul 12, 2012·Nature Communications·Soshi IimuraHideo Hosono

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Methods Mentioned

BETA
X-ray
AFM
neutron diffraction
neutron total scattering
inelastic neutron scattering

Software Mentioned

TOPAS
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