Coexistence of ferromagnetism and superconductivity in orthorhombic phase microparticles of the topological superconductor Mo2C
Bakhmetiev M. V.1,2, Dvoretskaya E. V.1, Kashin S. N.1,2, Savin V. V.2, Morgunov R. B.1,2,3
1Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS, Сhernogolovka, Russia
2Immanuel Kant Baltic Federal University, Kaliningrad, Russia
3Tambov State Technical University, Tambov, Russia
Email: bakhmetiev.maxim@gmail.com
The coexistence of ferromagnetism and superconductivity in β-Mo2C microparticles produced by pyrolysis was discovered. The dependences of the critical temperature (TC) and critical magnetic field (HC) of the superconducting state on the particle size of molybdenum carbide were obtained. As the microparticle diameter increases from 0.2 μm to 5 μm, the critical temperature of superconductivity decreases from 7.2 K to 3.7 K, and at a diameter of 10 μm, superconductivity is not detected in the studied temperature range from 2 K. The coercivity of the sample also decreases with increasing particle size, however, the samples remain ferromagnetic and retain a non-zero coercivity up to 300 K. The presence of ferromagnetism is explained by defects in the crystalline structure of the microparticles. Keywords: molybdenum carbide, microparticles, type II superconductivity, critical temperature, critical field.
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