Volume 130, Number 6, June 2020
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 July 2020|
The phase transition of ThFe1-xCoxAsN from superconductor to metallic paramagnet
1 Laboratory of Functional Molecules and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology - 266 Xincun Xi Road, Zibo, 255000, China
2 Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University Shanghai, 200240, China
3 School of Materials Science and Engineering, Shandong University of Technology - 266 Xincun Xi Road, Zibo, 255000, China
4 Tsung- Dao Lee Institute, Shanghai Jiao Tong University - Shanghai, 200240, China
5 Department of Physics, Zhejiang University - Hangzhou, 310027, China
6 Engineering Research Center of High Power Solid State Lighting Application System of Ministry of Education, Tiangong University - Tianjin, 300387, China
Received: 17 January 2020
Accepted: 17 June 2020
Differently from most of the other 1111-type iron-based superconductors, ThFeAsN itself shows superconductivity at 30 K without antiferromagnetism, even in the absence of chemical doping and other treating. In order to understand its peculiar behavior better, it is necessary to investigate the evolution of the superconducting phase through electron doping. Chemically, Co doping is a more effective way to introduce electrons, as carriers are doped directly into the FeAs planes. It also could provide information on how well the ThFeAsN tolerates in-plane disorder. Here we have substituted Co for Fe to synthesize ThFe1-xCoxAsN. It is found that the superconductivity of ThFeAsN parent compound is quickly suppressed upon Co doping. With a doping amount of ), the superconductivity of ThFe1-xCoxAsN vanishes. ThCoAsN has been synthesized and characterized. It shows no superconductivity at 1.8 K. As both its crystal structure and transport behaviour are similar to those of itinerant ferromagnets LaCoAsO and LaCoPO, it is expected that ThCoAsN would be a kind of itinerant ferromagnet. However, until 1.8 K, the expected itinerant ferromagnetism could not be confirmed. The experimental data support that ThCoAsN is a kind of metallic paramagnet above 1.8 K.
PACS: 74.25.-q – Properties of superconductors / 74.62.Bf – Effects of material synthesis, crystal structure, and chemical composition / 74.70.Xa – Pnictides and chalcogenides
© EPLA, 2020
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.