Academic Journal
Enhanced high-pressure superconductivity and local structure of the Ba8 Si46 clathrate
| العنوان: | Enhanced high-pressure superconductivity and local structure of the Ba8 Si46 clathrate |
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| المؤلفون: | Morales, F., Núñez-Regueiro, M., Toulemonde, Pierre, Machon, D., Le Floch, S., Pischedda, V., Lagarde, P., Flank, A., Itié, J., San-Miguel, A. |
| المساهمون: | Instituto de Investigaciones en Materiales (Mexico, Mexico), Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), Magnétisme et Supraconductivité (NEEL - MagSup), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ), Matériaux, Rayonnements, Structure (NEEL - MRS), Institut Lumière Matière Villeurbanne (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | ISSN: 2469-9950. |
| بيانات النشر: | HAL CCSD American Physical Society |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con] |
| الوصف: | International audience ; The high-pressure superconducting properties and the local structure of the Ba8Si46 clathrate have been studied using electrical resistance and x-ray absorption spectroscopy measurements up to more than 20 GPa. At pressures above 10–13 GPa, corresponding to a well-known volume collapse phase transformation, a sudden increase in the critical temperature leads to a maximum value of the superconducting critical temperature Tc of ∼8.5–9 K at 20 GPa. In the low-pressure clathrate phase, the superconducting critical temperature decreases as pressure is applied with an electron-phonon coupling constant λ=1.1 derived from the temperature evolution of the electrical resistance at different pressures. A progressive disorder in the Ba-Si correlations in the Ba@Si24 cages of the structure is observed for pressures beyond ∼5 GPa. These observations exclude a structural homothecy at the volume collapse transition. The high-pressure collapsed phase of Ba8Si46 is then associated with local structural changes and shows enhanced superconducting properties. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | hal-01692100; https://hal.science/hal-01692100; https://hal.science/hal-01692100/document; https://hal.science/hal-01692100/file/Morales2016.pdf |
| DOI: | 10.1103/PhysRevB.94.104507 |
| الاتاحة: | https://hal.science/hal-01692100 https://hal.science/hal-01692100/document https://hal.science/hal-01692100/file/Morales2016.pdf https://doi.org/10.1103/PhysRevB.94.104507 |
| Rights: | http://creativecommons.org/licenses/by/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.B1D1CAE3 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1103/PhysRevB.94.104507 |
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