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

Kong, Tai; Meier, William R.; Lin, Qisheng; Saunders, Scott M.; Bud'ko, Sergey L.; Flint, Rebecca; Canfield, Paul C.

doi:10.1103/PhysRevB.94.144434

Title: Physical properties of single crystalline $R {Mg}_{2} {Cu}_{9}$ $(R = Y, Ce - Nd, Gd - Dy, Yb)$ and the search for in-plane magnetic anisotropy in hexagonal systems

Journal Article · Mon Oct 24 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.144434· OSTI ID:1347414

Kong, Tai ^[1]; Meier, William R. ^[1]; Lin, Qisheng ^[1]; Saunders, Scott M. ^[1]; Bud'ko, Sergey L. ^[1]; Flint, Rebecca ^[1]; Canfield, Paul C. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)

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 non-local-moment-bearing metal with an electronic specific heat coefficient, γ ~ 15 mJ/mol K². 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 (Y_0.99Tb_0.01)Mg₂Cu₉ and (Y_0.99Dy_0.01)Mg₂Cu₉. Despite the strong, planar magnetization anisotropy, the in-plane magnetic anisotropy is weak and field-dependent. Finally, a set of crystal electric field parameters are proposed to explain the observed magnetic anisotropy.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358; GBMF4411

OSTI ID:: 1347414

Alternate ID(s):: OSTI ID: 1329957

Report Number(s):: IS-J-9195; PRBMDO; TRN: US1701336

Journal Information:: Physical Review B, Vol. 94, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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