Abstract
A cerium-containing pnictide, CeNiAsO, crystallized in the ZrCuSiAs-type structure, has beeninvestigated by measuring transport and magnetic properties, as well as specific heat. We foundthat CeNiAsO is an antiferromagnetic dense Kondo lattice metallic compound with Kondo scaleTK ∼ 15 K and shows an enhanced Sommerfeld coefficient ofγ0 ∼ 203 mJ mol K − 2. While no superconductivity can be observed down to 30 mK, Ce ions exhibit twosuccessive antiferromagnetic (AFM) transitions. We propose that the magnetic moment ofthe Ce ion could align in the G-type AFM order below the first transition atTN1 = 9.3 K, and it might be modified into the C-type AFM order below a lower transition atTN2 = 7.3 K. Our results indicate that the 3d–4f interlayer Kondo interactions play an important rolein Ni-based Ce-containing pnictides.
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