Structural and magnetic transitions in the crystalline approximant Cd6Sm

Article

关键词: ORDER-DISORDER TRANSITION;    PHASE-TRANSITION;    QUASI-CRYSTAL;    CUBIC CD6YB;   

DOI  :  10.1103/PhysRevB.85.014203

来源: SCIE

【 摘 要 】

Electrical resistivity, specific heat, magnetic susceptibility, and magnetization of the crystalline approximant Cd6Sm are investigated in a temperature range 1.8-300 K. Both structural and magnetic transitions are clearly evidenced. A sharp structural phase transition is observed at T-c = 179 K in the electrical resistivity as well as in the specific heat, which is attributed to orientational ordering of the Cd-4 tetrahedron located at the center of the icosahedral cluster. In addition, three successive magnetic transitions are found at T-M1 = 12.5, T-M2 = 10.2, and T-M3 = 6.5 K. The anomaly at T-M1 is attributed to an antiferromagnetic transition, whereas those at T-M2 and T-M3 are to ferrimagnetic transitions. The observation of the ferrimagnetic orders indicates that (pseudo) icosahedra made of localized Sm spins have a nonzero net magnetic moment, and the moments of the magnetic clusters form a long-range magnetic order.

【 授权许可】

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