Giant coercivity and spin clusters in high pressure polymorphs of Mn2LiReO6
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2022
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10. E. Solana-Madruga, C. Ritter, O. Mentré, J. P. Attfield, A. M. Arévalo-López. Giant coercivity and spin clusters in high pressure polymorphs of Mn2LiReO6. J. Mater. Chem. C, 2022,10, 4336-4341. doi: 10.1039/d2tc00451h
Abstract
We present Mn2LiReO6 synthesised at high pressure in two different polymorphs. They are the only A-site manganites with an ideal +/7+ charge distribution over the B/B′ sites. The lower pressure polymorph crystallises in a polar R3 ordered-ilmenite type structure (OIL) with a calculated 26.9 μC cm−2 electrical polarisation. It shows a cluster spin glass behaviour due to Li/Mn anti-site mixing. The well-ordered higher-pressure double-perovskite polymorph (DPv, P21/n) develops weak-ferromagnetism with giant magnetic coercivity (HC = 6.9 T at 2 K) due to magnetocrystalline anisotropy enhanced by symmetry-restricted exchange interactions but in the absence of spin–orbit coupling.