Magnetic properties of double perovskite : Hetero-tri-spin systems
- 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 TN. 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 TN 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.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
- Grant/Contract Number:
- 89233218CNA000001; DMR-1629059; DMR-1157490; DMR-1644779
- OSTI ID:
- 1494471
- Alternate ID(s):
- OSTI ID: 1493088
- Report Number(s):
- LA-UR-18-30816; PRBMDO
- Journal Information:
- Physical Review B, Vol. 99, Issue 1; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Rare earth double perovskites: a fertile soil in the field of perovskite oxides
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journal | January 2019 |
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