Volume 128, Number 6, December 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 February 2020|
Superconductivity at 4.6 K in the Cr-based nitride La3Cr10–x N11
1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190, China
2 School of Physical Sciences, University of Chinese Academy of Sciences - Beijing 100190, China
3 Department of Physics and Beijing Key Laboratory of Opto- electronic Functional Materials and Micro-nano Devices, Renmin University of China - Beijing 100872, China
4 School of Physical Science and Technology, ShanghaiTech University - Shanghai 201210, China
5 Songshan Lake Materials Laboratory - Dongguan, Guangdong 523808, China
6 Kavli Institute for Theoretical Sciences - Beijing 100190, China
Received: 2 November 2019
Accepted: 7 January 2020
A new Cr-based superconductor is discovered in cubic nitride , which is isostructural with . A cubic crystal structure of was determined by single-crystal X-ray diffraction. The superconducting transition temperature Tc from resistivity measurement is 4.6 K, while magnetization and specific heat measurements confirm its bulk property. The upper critical field of Hc2 is about 12.2 T, exceeding the Pauli paramagnetic limit. It is found that the crystallinity and stoichiometry of the samples play important roles in the observation of superconductivity in .
PACS: 74.70.-b – Superconducting materials other than cuprates / 74.25.-q – Properties of superconductors / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2020
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