Giant coercivity and spin clusters in high pressure polymorphs of Mn2LiReO6

Giant coercivity and spin clusters in high pressure polymorphs of Mn2LiReO6

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...

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Veröffentlicht in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2022-03, Vol.10 (11), p.4336-4341
Hauptverfasser: Solana-Madruga, Elena, Ritter, Clemens, Mentré, Olivier, Attfield, J Paul, Arévalo-López, Ángel M
Format: Artikel
Sprache:eng
Schlagworte:
Anisotropy
Charge distribution
Coercivity
Ferromagnetism
High pressure
Ilmenite
Perovskites
Spin glasses
Spin-orbit interactions
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Zusammenfassung: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.
ISSN:2050-7526
2050-7534
DOI:10.1039/d2tc00451h