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- W3087468082 abstract "We report the observation of an antiferroelectric (AFE) transition in cubic GaNb$_4$S$_8$ driven by an unconventional microscopic mechanism, the Jahn-Teller effect of Nb$_4$S$_4$ clusters. At T$_mathrm{JT}$ = 31 K, we observed a strong drop of the dielectric constant, a clear signature of frst-order AFE transitions. The frst-order character is also verifed by specifc heat and magnetic susceptibility measurements. Below T$_mathrm{JT}$, the combination of single-crystal and high-resolution powder X-ray dffraction revealed a violation of the previously reported space-group $Pbar{4}21m$, in favor of a lower-symmetric distortionpattern of the Nb$_4$S$_4$ clusters. In addition, weak ferroelectric polarization was found below T$_mathrm{JT}$, likely emerging due to the presence of polar domain walls within the otherwise AFE bulk structure." @default.
- W3087468082 created "2020-09-25" @default.
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- W3087468082 date "2020-09-16" @default.
- W3087468082 modified "2023-09-27" @default.
- W3087468082 title "Antiferroelectricity Driven by Cluster Jahn-Teller Effect in the Lacunar Spinel GaNb$_4$S$_8$" @default.
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