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| Home > Publications database > Successive ferroelectric orders and magnetoelectric coupling without long-range magnetic order in highly frustrated pyrochlore compounds: Sm$_2$Ti$_{2−x}$V$_x$O$_7$ |
| Home > Publications database > Successive ferroelectric orders and magnetoelectric coupling without long-range magnetic order in highly frustrated pyrochlore compounds: Sm$_2$Ti$_{2−x}$V$_x$O$_7$ |
| Journal Article | PUBDB-2025-04567 |
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2025
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/c2zb-17n9 doi:10.3204/PUBDB-2025-04567
Abstract: Sm$_2$Ti$_{2−x}$V$_x$O$_7$, a member of the rare-earth titanate pyrochlores, exhibits dipolar-octupolar antiferromagnetism below 𝑇$_𝑁$=0.35K. We observed two ferroelectric transitions at 182 (𝑇$_{FE1}$) and 52 K (𝑇$_{FE2}$), significantly higher than 𝑇$_𝑁$ for Sm$_2$Ti$_{2−𝑥}$V$_𝑥$O$_7$ (𝑥=0,0.1). Although the ferroelectric transition temperatures remain unchanged, the polarization value decreases with V doping. A structural transition to a polar 𝑅3𝑚 rhombohedral phase from the cubic 𝐹𝑑$\bar{3}$𝑚 structure occurs at 𝑇$_{FE1}$ for the pristine compound, involving a distortion in the pyrochlore lattices formed by the Sm atoms. Remarkably, linear magnetoelectric coupling is observed in both compounds, with further enhancement of magnetoelectric (ME) coupling due to magnetic V doping. The existence of magnetoelectric coupling without long-range magnetic order is of fundamental interest for advancing the understanding and development of ME coupling.
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