Antipolar transitions in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>GaNb</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>GaTa</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>
نویسندگان
چکیده
Applying dielectric spectroscopy and other techniques, the authors find antipolar ordering at structural magnetic transitions of lacunar spinels GaNb${}_{4}$Se${}_{8}$ GaTa${}_{4}$Se${}_{8}$, materials with substantial spin-orbit coupling. It arises from polar distortions moleculelike Nb${}_{4}$Se${}_{4}$ Ta${}_{4}$Se${}_{4}$ clusters, typical for crystalline lattice spinels. Moreover, aside dipolar relaxations weak ferroelectric ordering, charge transport governed by in-gap impurity states is found low temperatures, as previously suggested to explain resistive switching in these compounds.
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ژورنال
عنوان ژورنال: Physical review
سال: 2022
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevb.106.115146