Repozytorium publikacji - Politechnika Gdańska

Three new double corundum derivative compounds, Fe3−xInSnxO6 (x = 0. 0.25, or 0.5), were synthesized at high pressure and temperature (6 GPa and 1400− 1450 °C). All of the compounds order antiferromagnetically well above room temperature (TN = 608, 532, and 432 K for x = 0, 0.25, and 0.5, respectively). The x = 0 phase crystallizes as centrosymmetric R3̅c, but the inclusion of closed-shell d10 Sn4+ induces x = 0.25 and 0.5 to crystallize as noncentrosymmetric R3c. Microprobe measurements indicate that for x = 0.25 and 0.5, the substitution of Sn4+ is not offset by vacancies, which implies the presence of Fe2+, as corroborated by X-ray absorption near-edge spectroscopy and single-crystal X-ray structure refinements. Neutron powder diffraction experiments on x = 0.5 indicate that these compounds are canted A-type antiferromagnets that, like Fe2O3 and InFeO3, consist of ferromagnetic layers that stack antiferromagnetically with a single magnetic transition. Weak ferromagnetic interactions persist to very high temperatures. Temperature-dependent second harmonic generation (SHG) measurements on x = 0.25 and 0.5 show a SHG response with ferroelectric-like hysteretic maxima that correspond with the respective magnetic transitions, which suggest coupling of the magnetic and polarization order. These new compounds provide more information about fine-tuning the electronic, magnetic, and structural properties of corundum-derived mutlferroics in the search for tunable high-temperature magnetoelectric materials.

Autorzy

• Corey E. Frank,
• Emma E. McCabe,
• Fabio Orlandi,
• Pascal Manuel,
• Xiaoyan Tan,
• Zheng Deng,
• Changqing Jin,
• Mark Croft,
• Thomas Emge,
• Shukai Yu,
• Huaiyu Wang,
• Venkatraman Gopalan,
• Saul Lapidus,
• MeiXia Wu,
• Man-Rong Li,
• Juliane Gross,
• Paul Burger,
• dr hab. inż. Aleksandra Mielewczyk-Gryń link otwiera się w nowej karcie ,
• prof. dr hab. inż. Tomasz Klimczuk link otwiera się w nowej karcie ,
• Weiwei Xie,
• David Walker,
• Martha Greenblatt