Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.
J Phys Condens Matter. 2011 May 4;23(17):175701. doi: 10.1088/0953-8984/23/17/175701. Epub 2011 Apr 8.
A cerium-containing pnictide, CeNiAsO, crystallized in the ZrCuSiAs-type structure, has been investigated by measuring transport and magnetic properties, as well as specific heat. We found that CeNiAsO is an antiferromagnetic dense Kondo lattice metallic compound with Kondo scale T(K) ∼15 K and shows an enhanced Sommerfeld coefficient of γ(0) ∼203 mJ mol K(-2). While no superconductivity can be observed down to 30 mK, Ce ions exhibit two successive antiferromagnetic (AFM) transitions. We propose that the magnetic moment of the Ce ion could align in the G-type AFM order below the first transition at T(N1)=9.3 K, and it might be modified into the C-type AFM order below a lower transition at T(N2)=7.3 K. Our results indicate that the 3d-4f interlayer Kondo interactions play an important role in Ni-based Ce-containing pnictides.
一种含铈的磷化物 CeNiAsO，具有 ZrCuSiAs 型结构，其输运和磁性质以及比热已通过测量进行了研究。我们发现 CeNiAsO 是一种反铁磁密近藤晶格金属化合物，具有近藤标度 T(K)∼15 K，并表现出增强的 Sommerfeld 系数 γ(0)∼203 mJ mol K(-2)。虽然在 30 mK 以下没有观察到超导性，但 Ce 离子表现出两个连续的反铁磁 (AFM) 转变。我们提出 Ce 离子的磁矩可能在 T(N1)=9.3 K 以下的第一个转变下沿 G 型 AFM 序排列，并且可能在 T(N2)=7.3 K 以下的较低转变下被修改为 C 型 AFM 序。我们的结果表明，3d-4f 层间 Kondo 相互作用在 Ni 基含 Ce 的磷化物中起着重要作用。
