Effect of external pressure on the magnetic properties of LnFeAsO (Ln = La, Ce, Pr, Sm)
Academic Article
Publication Date:
2012
abstract:
Abstract. We investigate the eect of external pressure on magnetic order in
undoped LnFeAsO (Ln = La, Ce, Pr, La) by using muon-spin relaxation measurements
and ab-initio calculations. Both magnetic transition temperature Tm and Fe magnetic
moment decrease with external pressure. The eect is observed to be lanthanide
dependent with the strongest response for Ln = La and the weakest for Ln = Sm. The
trend is qualitatively in agreement with our DFT calculations. The same calculations
allow us to assign a value of 0.68(2) B to the Fe moment, obtained from an accurate
determination of the muon sites. Our data further show that the magnetic lanthanide
order transitions do not follow the simple trend of Fe, possibly as a consequence of the
dierent f-electron overlap.
Iris type:
01.01 Articolo in rivista
Keywords:
Ab initio calculations; Density functional theory calculations; External pressures; F-electrons; Magnetic orders; Magnetic transition temperature; Muon site; Muon-spin-relaxation measurements
List of contributors:
Palenzona, Andrea; Bernardini, Fabio; Massidda, Sandro; Tropeano, Matteo; Vignolo, Maurizio
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