Magnetic properties of double perovskite Ln2CoIrO6 (Ln=Eu,&nbsp;Tb,&nbsp;Ho) : Hetero-tri-spin 3d-5d-4f systems

Ding, Xiaxin; Gao, Bin; Krenkel, Elizabeth; Dawson, Charles; Eckert, James C.; Cheong, Sang-Wook; Zapf, Vivien

doi:10.1103/PhysRevB.99.014438

Magnetic properties of double perovskite $L n_{2} {CoIrO}_{6}$ $(L n = Eu, Tb, Ho)$ : Hetero-tri-spin $3 d - 5 d - 4 f$ systems

Journal Article · Wed Jan 30 23:00:00 EST 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.014438· OSTI ID:1494471

^[1]; Gao, Bin ^[2]; Krenkel, Elizabeth ^[3]; Dawson, Charles ^[3]; Eckert, James C. ^[3]; Cheong, Sang-Wook ^[2]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Rutgers Center for Emergent Materials, Piscataway, NJ (United States). Dept. of Physics and Astronomy
Harvey Mudd College, Claremont, CA (United States). Dept. of Physics

The field of double perovskites is now advancing to three magnetic elements on the A, B and B' sites. A series of iridium-based double perovskite compounds, Ln₂ CoIrO₆ (Ln = Eu, Tb, Ho), with three magnetic elements was synthesized as polycrystalline samples. The compounds crystalize in monoclinic structures with the space group P2₁/n. Magnetic properties of these hetero-tri-spin 3 d-5 d-4 f systems were studied by magnetic susceptibility and field dependent magnetization in both DC and pulsed magnetic fields. All these compounds show ferrimagnetic transitions at temperatures T C above 100 K, which are attributable to antiferromagnetic coupling between Co²⁺ and Ir⁴⁺ spins. For Eu₂ CoIrO₆, the magnetic properties are similar to those of La₂CoIrO₆. The Eu³⁺ spins show Van Vleck paramagnetism, and do not significantly interact with transition-metal cations. In contrast, Tb₂ CoIrO₆ and Ho₂ CoIrO₆ reveal a second transition to antiferromagnetic order below a lower temperature T_N. The temperature-induced ferrimagnetic-to-antiferromagnetic phase transition might be explained by a spin-reorientation transition. Moreover, a magnetic-field-induced spin-flop-like transition with a small hysteresis was observed below T_N in these two compounds. The magnetic moments of all three compounds do not saturate up to 60 T at low temperatures. A moderate magnetocaloric effect was also observed in all three compounds. Our results should motivate further investigation of the spin configuration on single crystals of these iridium-based double perovskites.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1494471

Alternate ID(s):: OSTI ID: 1493088

Report Number(s):: LA-UR-18-30816

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 99; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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