ACTA

Magnetic Properties of Icosahedral (Au,Cu)-Al-Yb Quasicrystals

S. Oki^a, T. Hiroto^a, Y. Muro^b and R. Tamura^a
^aDepartment of Materials Science and Technology, Tokyo University of Science, Katsushika-ku,Tokyo, 125-8585, Japan
^bDepartment of Liberal Arts and Sciences, Toyama Prefectural University, Imizu Toyama, 939-0398, Japan

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We have synthesized Cu-substituted (Au,Cu)-Al-Yb quasicrystals in order to investigate the relationship between the quasilattice constant and the magnetic property. The quasilattice constant a_R is found to decrease as Au is replaced by Cu, and the maximum reduction of 2.18% in a_R was observed for x=0.60 in (Au_1-xCu_x)₄₉Al₃₄Yb₁₇. Magnetic measurements of (Au_1-xCu_x)₄₉Al₃₄Yb₁₇ (x=0, 0.10, 0.20, 0.50) show that the intermediate-valence state of Yb persists in all the studied compositions. The effective magnetic moment is found to depend on r̅/a_R rather than on the quasilattice constant a_R. This suggests that r̅/a_R can be regarded as a measure of the chemical pressure induced on the Yb atoms.

DOI: 10.12693/APhysPolA.126.553
PACS numbers: 75.50.Kj, 75.20.Hr