Reference : Phase transitions in LaFeAsO: Structural, magnetic, elastic, and transport properties, h...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/4609
Phase transitions in LaFeAsO: Structural, magnetic, elastic, and transport properties, heat capacity and Mossbauer spectra
English
McGuire, Michael A [> > > >]
Christianson, Andrew D [> > > >]
Sefat, Athena S [> > > >]
Sales, Brian C [> > > >]
Lumsden, Mark D [> > > >]
Jin, Rongying [> > > >]
Payzant, E Andrew [> > > >]
Mandrus, David [> > > >]
Luan, Yanbing [> > > >]
Keppens, Veerle [> > > >]
Varadarajan, Vijayalaksmi [> > > >]
Brill, Joseph W [> > > >]
Hermann, Raphaël mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Sougrati, Moulay Tahar mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Grandjean, Fernande mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Long, Gary J [> > > >]
2008
Physical Review. B
American Physical Society
78
9
Yes (verified by ORBi)
International
1098-0121
College Pk
[en] LaFeAsO ; oxypnictide ; superconductors
[en] We present results from a detailed experimental investigation of LaFeAsO, the parent material in the series of "FeAs" based oxypnictide superconductors. Upon cooling, this material undergoes a tetragonal-orthorhombic crystallographic phase transition at similar to 160 K followed closely by an antiferromagnetic ordering near 145 K. Analysis of these phase transitions using temperature dependent powder x-ray and neutron-diffraction measurements is presented. A magnetic moment of similar to 0.35 mu(B) per iron is derived from Mossbauer spectra in the low-temperature phase. Evidence of the structural transition is observed at temperatures well above the transition temperature (up to near 200 K) in the diffraction data as well as the polycrystalline elastic moduli probed by resonant ultrasound spectroscopy measurements. The effects of the two phase transitions on the transport properties (resistivity, thermal conductivity, Seebeck coefficient, and Hall coefficient), heat capacity, and magnetization of LaFeAsO are also reported, including a dramatic increase in the magnitude of the Hall coefficient below 160 K. The results suggest that the structural distortion leads to a localization of carriers on Fe, producing small local magnetic moments which subsequently order antiferromagnetically upon further cooling. Evidence of strong electron-phonon interactions in the high-temperature tetragonal phase is also observed.
http://hdl.handle.net/2268/4609
10.1103/PhysRevB.78.094517
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000078000009094517000001&idtype=cvips&gifs=yes

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