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Physical properties of single crystalline RMg2Cu9 (R = Y, Ce-Nd, Gd-Dy, Yb) and the search for in-plane magnetic anisotropy in hexagonal systems

TitlePhysical properties of single crystalline RMg2Cu9 (R = Y, Ce-Nd, Gd-Dy, Yb) and the search for in-plane magnetic anisotropy in hexagonal systems
Publication TypeJournal Article
Year of Publication2016
AuthorsKong, T, Meier, WR, Lin, Q, Saunders, SM, Bud'ko, SL, Flint, R, Canfield, PC
JournalPhysical Review B
Volume94
Pagination144434
Date Published10
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000390348300012
Keywordsangular-dependence, earth rhodium borides, electric-field, gadolinium compounds, honi2b2c, la-nd, metamagnetic transitions, physics, quasi-crystals, sm, transport-properties
Abstract

Single crystals of RMg2Cu9 (R = Y, Ce-Nd, Gd-Dy, Yb) were grown using a high-temperature solution growth technique and were characterized by measurements of room-temperature x-ray diffraction, temperature-dependent specific heat, and temperature-and field-dependent resistivity and anisotropic magnetization. YMg2Cu9 is a nonlocal-moment-bearing metal with an electronic specific heat coefficient, gamma similar to 15 mJ/mol K-2. Yb is divalent and basically non-moment-bearing in YbMg2Cu9. Ce is trivalent in CeMg2Cu9 with two magnetic transitions being observed at 2.1 K and 1.5 K. PrMg2Cu9 does not exhibit any magnetic phase transition down to 0.5 K. The other members being studied (R = Nd, Gd-Dy) all exhibit antiferromagnetic transitions at low temperatures ranging from 3.2 K for NdMg2Cu9 to 11.9 K for TbMg2Cu9. Whereas GdMg2Cu9 is isotropic in its paramagnetic state due to zero angular momentum (L = 0), all the other local-moment-bearing members manifest an anisotropic, planar magnetization in their paramagnetic states. To further study this planar anisotropy, detailed angular-dependent magnetization was carried out on magnetically diluted (Y0.99Tb0.01) Mg2Cu9 and (Y0.99Dy0.01) Mg2Cu9. Despite the strong, planar magnetization anisotropy, the in-plane magnetic anisotropy is weak and field-dependent. A set of crystal electric field parameters are proposed to explain the observed magnetic anisotropy.

DOI10.1103/PhysRevB.94.144434
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Complex States

Alternate JournalPhys. Rev. B