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Nature Materials

Resumen/Descripción – provisto por la editorial en inglés

Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. Materials research is a diverse and fast-growing discipline, which has moved from a largely applied, engineering focus to a position where it has an increasing impact on other classical disciplines such as physics, chemistry and biology. Nature Materials covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties and performance of materials, where "materials" are identified as substances in the condensed states (liquid, solid, colloidal) designed or manipulated for technological ends.

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Información

Tipo de recurso:

revistas

ISSN impreso

1476-1122

ISSN electrónico

1476-4660

Editor responsable

Springer Nature

País de edición

Reino Unido

Fecha de publicación

2001-

Cobertura temática

Ciencias físicas

Ciencias químicas

Ingeniería mecánica

Ingeniería de los materiales

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doi: 10.1038/s41563-023-01483-7

Dynamic crystallography reveals spontaneous anisotropy in cubic GeTe

Simon A. J. Kimber; Jiayong Zhang; Charles H. Liang; Gian G. Guzmán-Verri; Peter B. Littlewood; Yongqiang Cheng; Douglas L. Abernathy; Jessica M. Hudspeth; Zhong-Zhen Luo; Mercouri G. Kanatzidis; Tapan Chatterji; Anibal J. Ramirez-Cuesta; Simon J. L. Billinge

<jats:title>Abstract</jats:title><jats:p>Cubic energy materials such as thermoelectrics or hybrid perovskite materials are often understood to be highly disordered<jats:sup>1,2</jats:sup>. In GeTe and related IV–VI compounds, this is thought to provide the low thermal conductivities needed for thermoelectric applications<jats:sup>1</jats:sup>. Since conventional crystallography cannot distinguish between static disorder and atomic motions, we develop the energy-resolved variable-shutter pair distribution function technique. This collects structural snapshots with varying exposure times, on timescales relevant for atomic motions. In disagreement with previous interpretations<jats:sup>3–5</jats:sup>, we find the time-averaged structure of GeTe to be crystalline at all temperatures, but with anisotropic anharmonic dynamics at higher temperatures that resemble static disorder at fast shutter speeds, with correlated ferroelectric fluctuations along the <100><jats:sub>c</jats:sub> direction. We show that this anisotropy naturally emerges from a Ginzburg–Landau model that couples polarization fluctuations through long-range elastic interactions<jats:sup>6</jats:sup>. By accessing time-dependent atomic correlations in energy materials, we resolve the long-standing disagreement between local and average structure probes<jats:sup>1,7–9</jats:sup> and show that spontaneous anisotropy is ubiquitous in cubic IV–VI materials.</jats:p>