Superconductivity and magnetism in noncentrosymmetric RhGe
| Autor: | Vladimir E. Dmitrienko, Vladimir A. Sidorov, Alla E. Petrova, L.N. Fomicheva, I. P. Zibrov, A. V. Tsvyashchenko |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Spin polarization Magnetism Mechanical Engineering Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology Ferromagnetic superconductor 01 natural sciences Andreev reflection Magnetization Ferromagnetism Mechanics of Materials Electrical resistivity and conductivity Condensed Matter::Superconductivity 0103 physical sciences Materials Chemistry 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 686:431-437 |
| ISSN: | 0925-8388 |
| Popis: | RhGe synthesized at high pressure crystallizes in the noncentrosymmetric B20 cubic structure. Measurements of electrical resistivity and magnetization demonstrate a superconducting state below T c ∼ 4.3 K and weak ferromagnetism below T m ∼ 140 K. Specific heat data confirm the bulk nature of superconductivity in this ferromagnetic superconductor. Point contact spectra in the superconducting state exhibit the complex Andreev reflection signal which may indicate a mixed singlet-triplet order parameter. The superconducting region forms a dome on the P-T diagram with a maximum of T c near 4 GPa. It was also found that the superconductivity of RhGe 4 is suppressed at high pressure in contrast with RhGe. Ab initio simulations suggest that the observed weak magnetization emerges from the pronounced toroidal-like spin polarization with magnetic quadrupole and toroidal moments located at Rh and Ge sites. |
| Databáze: | OpenAIRE |
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