Magnetocrystalline anisotropy in the Kondo-lattice compound CeAgAs2

Article

关键词: HEAVY-FERMION SYSTEMS;    MAGNETIC-PROPERTIES;    CRYSTAL-STRUCTURE;    CERIUM COMPOUND;    MIXED-VALENT;    LA-ND;    SUPERCONDUCTIVITY;    TRANSPORT;    GD;    SM;   

DOI  :  10.1103/PhysRevB.98.115160

来源: SCIE

【 摘 要 】

( )We report on the single-crystal growth and anisotropic physical properties of CeAgAs2. The compound crystallizes as an ordered variant of the HfCuSi2-type crystal structure and adopts the orthorhombic space group Pmca (No. 57) with two symmetry-inequivalent cerium atomic positions in the unit cell. The orthorhombic crystal structure of the single crystal was confirmed from the powder x-ray diffraction and from electron diffraction patterns obtained from the transmission electron microscope. The anisotropic physical properties have been investigated on a good-quality single crystal by measuring the magnetic susceptibility, isothermal magnetization, electrical transport, and heat capacity. The magnetic susceptibility and magnetization measurements revealed that this compound orders antiferromagnetically with two closely spaced magnetic transitions at T-N1 = 6 K and T-N2 = 4.9 K. Magnetization studies have revealed a large magnetocrystalline anisotropy due to the crystalline electric field with an easy axis of magnetization along the [010] direction. The magnetic susceptibility measured along the [001] direction exhibited a broad hump in the temperature range 50 to 250 K, while typical Curie-Weiss behavior was observed along the other two orthogonal directions. The electrical resistivity and the heat capacity measurements revealed that CeAgAs2 is a Kondo-lattice system with a magnetic ground state.

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