Flux growth of Yb6.6Ir6Sn16 having mixed valent ytterbium

Published

June 12, 2014

Author(s)

Sebastian Peter, Udumula Subbarao, Sudhindra Rayaprol, Joshua B. Martin, Mahalingam Balasubramanian, Christos D. Malliakas, Mercouri G. Kanatzidis

Abstract

The new compound Yb6.6Ir6Sn16 was obtained as single crystals in high yield from the reaction of Yb with Ir and Sn run in excess indium. Single crystal X-ray diffraction analysis shows that Yb6.6Ir6Sn16 crystallizes in the tetragonal space group P42/nmc with a = b = 9.6972(8) Å and c = 13.7139(16) Å. The crystal structure is composed of a [Ir6Sn16] polyanionic network with cages in which the Yb atoms are embedded. The Yb sublattice features extensive vacancies on one crystallographic site. Magnetic susceptibility measurements on single crystals samples indicate Curie-Weiss law behavior < 100K with no magnetic ordering down to 2 K. The magnetic moment within the linear region (< 100 K) is 3.21 µB/Yb, which is ≈70% of the expected value for a free ion Yb3+ suggesting the presence of mixed valent ytterbium atoms. X-ray absorption near edge spectroscopy (XANES) confirms that Yb6.6Ir6Sn16 exhibits mixed valence. Resistivity and heat capacity measurements for Yb6.6Ir6Sn16 indicate non-Fermi liquid metallic behavior.

Citation

Inorganic Chemistry

Pub Type

Journals

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DOI Link

Keywords

Intermetallics, mixed valency, magnetism, resistivity, heat capacity

Citation

Peter, S. , Subbarao, U. , Rayaprol, S. , Martin, J. , Balasubramanian, M. , Malliakas, C. and Kanatzidis, M. (2014), Flux growth of Yb6.6Ir6Sn16 having mixed valent ytterbium, Inorganic Chemistry, [online], https://doi.org/10.1021/ic500204t (Accessed October 8, 2024)