Large Magnetoresistance Effects in $Ln$CoAsO with a Ferromagnetic-Antiferromagnetic Transition

Abstract

A large magnetoresistance (MR) effect was observed in the layered compounds NdCoAsO and SmCoAsO, in which ferromagnetically ordered itinerant-electrons of Co are sandwiched by localized 4$f$-electrons of $L{n}^{3+}$, below ferromagnetic-antiferromagnetic transition (FAFT) temperature $T_{\mathrm{N}}$ as observed in other FAFT compounds. In SmCoAsO, the large MR effect is also observed up to the Curie temperature $T_{\mathrm{C}}$, and it is found to be originating in the presence of another antiferromagnetic phase in the low-magnetic field region of the ferromagnetic phase.

5 pages, 5 figures

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Cited by in corpus (5)

• Common effect of chemical and external pressures on the magnetic properties of RECoPO (RE = La, Pr)
• Magnetic phase diagram in the Co-rich side of LnCo1-xFexAsO (Ln=La, Sm) system
• Common effect of chemical and external pressures on the magnetic properties of $R$CoPO ($R$ = La, Pr, Nd, Sm). II
• Effect of external pressure on the magnetic properties of $R$CoAsO ($R$ = La, Pr, Sm): a $\mu$SR study
• Magnetocrystalline anisotropic effect in GdCo${}_{1-x}$Fe${}_x$AsO ($x=0,0.05$)