Magnetic and transport properties of YBNIGe with a TiNiSi-type structure

Koji Araki, Takeru Kohei, Hiroki Tanaka, Shintaro Nakamura, Tsutomu Nojima, Akira Ochiai, Kenichi Katoh

研究成果: Article査読

抄録

The magnetic and transport properties of a single crystal of YbNiGe with an orthorhombic TiNiSi-type structure are presented here. The experimental results indicate that YbNiGe undergoes two successive antiferromagnetic transitions at TN = 3.6K and Tm = 3.0K at zero field. The magnetic susceptibility and magnetization for the three principal axes show large anisotropy with the magnetic easy-axis along the a-axis, reflecting the orthorhombic crystal structure. The electrical resistivity for the current along the three principal axes shows a metallic behavior with a Kondo increase below around 50K. The magnetic entropy released at TN is 54% of Rln2 for the Kramers doublet ground state. The Sommerfeld coefficient γ is estimated to be 83.3mJ=mol K2 below 1K. The obtained value of A=γ2, where A is the coefficient of the T2 dependence of the resistivity at low temperatures, is larger than the universal value of the Kadowaki–Woods relation for heavy-fermion systems, i.e., A=γ2 = 1.0 × 10−5µΩ·cm(mol·K=mJ)2. Furthermore, this paper discusses the possible nature of two successive antiferromagnetic transitions of YbNiGe in comparison with related isostructural YbTGe compounds.

本文言語English
論文番号114709
ジャーナルjournal of the physical society of japan
88
11
DOI
出版ステータスPublished - 2019 1 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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