Effect of 3d Transition Metal Doping on the Superconductivity in Quaternary Fluoroarsenide CaFeAsF

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dc.creatorMatsuishi, Satoru
dc.creatorInoue, Yasunori
dc.creatorNomura, Takatoshi
dc.creatorKamihara, Youichi
dc.creatorHirano, Masahiro
dc.creatorHosono, Hideo
dc.date2008-11-07
dc.date2009-03-04
dc.date.accessioned2026-07-07T12:48:26Z
dc.date.available2026-07-07T12:48:26Z
dc.descriptionWe examined doping effect of 3d transition metal elements (TM: Cr, Mn, Co, Ni, and Cu) at the Fe site of a quaternary fluoroarsenide CaFeAsF, an analogue of 1111-type parent compound LaFeAsO. The anomaly at ~120 K observed in resistivity (rho) vs. temperature (T) plot for the parent compound is suppressed by the doping of each TM element. Furthermore, Co- and Ni-doping (CaFe1-xTMxAsF, TM = Co, Ni) induces superconductivity with a transition temperature maximized at the nominal x = 0.10 for Co (22 K) and at x = 0.05 for Ni (12 K). These optimal doping levels may be understood by considering that Ni2+(3d8) adds double electrons to the FeAs layers compared with Co2+ (3d7). Increased x for Co or Ni breaks the superconductivity while metallic nature drho/dT > 0 is still kept. These observations indicate that Co and Ni work as electron donors. In contrast, neither of Cr, Mn nor Cu-doping induce superconductivity, yielding drho/dT < 0 in the below the rho-T anomaly temperature, indicating that these transition metal ions act as scattering centers. The two different behavior of TM replacing the Fe site is discussed in relation to the changes in the lattice constants with the doping.
dc.description15 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0811.1147
dc.identifierhttp://arxiv.org/abs/0811.1147
dc.identifierNew J. Phys. 11 025012 (2009)
dc.identifierdoi:10.1088/1367-2630/11/2/025012
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/222053
dc.subjectSuperconductivity
dc.titleEffect of 3d Transition Metal Doping on the Superconductivity in Quaternary Fluoroarsenide CaFeAsF
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