Negative thermal expansion near two structural quantum phase transitions Connor
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| Autores: | , |
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| Formato: | artículo preliminar |
| Fecha de Publicación: | 2017 |
| Descripción: | Recent experimental work has revealed that the unusually strong, isotropic structural negative thermal expansion in cubic perovskite ionic insulator ScF3 occurs in excited states above a ground state tuned very near a structural quantum phase transition, posing a question of fundamental interest as to whether this special circumstance is related to the anomalous behavior. To test this hypothesis, we report an elastic and inelastic x-ray scattering study of a second system Hg2I2 also tuned near a structural quantum phase transition while retaining stoichiometric composition and high crystallinity. We find similar behavior and significant negative thermal expansion below 100 K for dimensions along the body-centered-tetragonal c axis, bolstering the connection between negative thermal expansion and zero-temperature structural transitions.We identify the common traits between these systems and propose a set of materials design principles that can guide discovery of newmaterials exhibiting negative thermal expansion |
| País: | Kérwá |
| Institución: | Universidad de Costa Rica |
| Repositorio: | Kérwá |
| OAI Identifier: | oai:kerwa.ucr.ac.cr:10669/73706 |
| Acceso en línea: | https://link.aps.org/doi/10.1103/PhysRevMaterials.1.070603 https://hdl.handle.net/10669/73706 |
| Palabra clave: | quantum phase transitions inelastic light scattering x-ray diffraction |