The non-center symmetrical superconductor Rh2Mo3N exhibits abundant magnetic, electrical, and specific heat characteristics. Experimental data and theoretical fittings show that the Rh2Mo3N superconducting Cooper pair is dominated by the s-wave singlet pairing mechanism.
Non-centric symmetry materials have a wealth of physical phenomena. For example, in non-centrosymmetric ferromagnetic materials, due to the existence of ferromagnetic exchange and competition for DM interactions, the topological Skyrmion phase will appear under the external magnetic field. Similarly, in some non-centrosymmetric superconductors, due to their anti-centrosymmetric Rashba spin-orbit interactions, the material will exhibit novel properties that are different from conventional superconducting materials. For example, the theory predicts that superconducting states may appear. Superconductivity's mixed features of spin singlet and spin triplet.
Recently, Wei Wensen, Ph.D. student of the Chinese Academy of Sciences Zhang Yuheng, under the joint guidance of Dr. Du Haifeng and researcher Tian Mingliang of the Strong Magnetic Field Science Center of the Chinese Academy of Sciences, Hefei Institute of Physics, for the first time synthesised a non-central symmetric transition metal nitride Rh2Mo3N [PHYSICAL REVIEW B] On the basis of 93, 060409(R) (2016), its physical properties were studied. The experimental results show that the material exhibits superconductivity with a transition temperature of 4.3 K. Through further research on its resistance, magnetism, specific heat, and Andreev reflection, it was found that the material exhibits a very obvious superconducting pairing mechanism dominated by the singlet s-wave singlet states. By doping the material magnetic elements iron and cobalt, superconductivity is suppressed, but a non-trivial Skyrmion phase appears. Therefore, this work not only provides new opportunities for the exploration of non-centric symmetrical superconducting physics, but also provides new ideas for exploring the mechanism of mutual competition between non-centric symmetric superconductors and non-trivial topological magnetic sigmunds.
This work was carried out in collaboration with professor Chen Tingyong of Arizona State University, CL Chien of Johns Hopkins University, and Professor Jia Jiadong of New Hampshire University. The paper was published online on September 7th. In "Physical Review B".
The data of this working part was tested on the multi-functional property testing system, magnetic testing system and X-ray diffractometer equipment of the steady state strong magnetic field experimental device SHMFF, and obtained the National Natural Science Foundation, the Youth Innovation Promotion Association of the Chinese Academy of Sciences, and the Chinese Academy of Sciences/Foreign Experts Bureau. (CAS/SAFEA) International Cooperative Innovation Research team project support.
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