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Suppression of spin density wave by isoelectronic substitution in PrFe(1-x)Ru(x)AsO

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arxiv 0904.1570 v2 pith:6XKFPPB6 submitted 2009-04-09 cond-mat.supr-con cond-mat.str-el

Suppression of spin density wave by isoelectronic substitution in PrFe(1-x)Ru(x)AsO

Michael A. McGuire , David J. Singh , Athena S. Sefat , Brian C. Sales , David Mandrus This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords substitutiondensityincreasesisoelectronicspinsuppressedsuppressionwave
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have studied the effects of the isoelectronic substitution of Ru for Fe in polycrystalline samples of the spin density wave (SDW) material PrFeAsO. Crystal structures from powder x-ray diffraction at room temperature and transport properties from 2-300 K are reported. The SDW is completely suppressed upon Ru substitution. The distortion of the tetrahedral coordination environment of the transition metal site increases as the Ru concentration increases, which may be related to the absence of superconductivity above 2 K. Band structure calculations show that the larger size of Ru 4$d$ orbitals is primarily responsible for the suppression of magnetism as Ru is substituted into the Fe layer. The experimental results indicate that long-ranged magnetic order of Pr moments is suppressed at Ru concentrations as low as 10%.

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