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Physical Review Letters, том 122, издание 2, номер публикации: 027001

Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures.

Somayazulu Maddury 1
Ahart Muhtar 1
Mishra Ajay K. 2
Geballe Zachary M. 2
Baldini Maria 2
Meng Yue 3
Struzhkin Viktor V. 2
Hemley Russell J. 1
1
 
Institute for Materials Science and Department of Civil and Environmental Engineering, The George Washington University, Washington, DC 20052, USA
2
 
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
3
 
HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Тип документа
Дата публикации2019-01-14
ИздательAmerican Physical Society
Название журналаPhysical Review Letters
Квартиль по SCImagoQ1
Квартиль по Web of ScienceQ1
Импакт-фактор 20219.19
ISSN00319007, 10797114
General Physics and Astronomy
Краткое описание
Recent predictions and experimental observations of high T_{c} superconductivity in hydrogen-rich materials at very high pressures are driving the search for superconductivity in the vicinity of room temperature. We have developed a novel preparation technique that is optimally suited for megabar pressure syntheses of superhydrides using modulated laser heating while maintaining the integrity of sample-probe contacts for electrical transport measurements to 200 GPa. We detail the synthesis and characterization of lanthanum superhydride samples, including four-probe electrical transport measurements that display significant drops in resistivity on cooling up to 260 K and 180-200 GPa, and resistivity transitions at both lower and higher temperatures in other experiments. Additional current-voltage measurements, critical current estimates, and low-temperature x-ray diffraction are also obtained. We suggest that the transitions represent signatures of superconductivity to near room temperature in phases of lanthanum superhydride, in good agreement with density functional structure search and BCS theory calculations.
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