Electronic structure, magnetism, and spin fluctuations in the superconducting weak ferromagnet Y4Co3
B. Wiendlocha, J. Tobola, S. Kaprzyk, A. Kolodziejczyk
DOI 10.1103/PhysRevB.83.094408 · Physical Review B
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Abstract
Results of the first principles study on the electronic structure and magnetism of the superconducting weak ferromagnet Y4Co3 are presented. Using the full potential Korringa-Kohn-Rostoker (FP-KKR) method, densities of states, dispersion curves, and magnetic moments were calculated for a quasiordered structural model of the compound in the framework of the local-density approximation. Spin-polarized KKR calculations confirm that weak ferromagnetic properties of Y4Co3 can be attributed to only one cobalt atom located on the (2b) site in the unit cell, while another 20 Co and Y atoms act as a diamagnetic environment. Moreover, the magnetic Co atoms form quasi-one-dimensional chains along the z direction. The magnitude of the Co(2b) magnetic moment (0.55 μB) markedly overestimates the experimental value (0.23 μB), which suggests the importance of spin fluctuations in this system. Calculated distribution of spin magnetization in the unit cell provides a background for discussion of the coexistence of ferromagnetism and superconductivity in Y4Co3. Finally, the effect of pressure on magnetism is discussed and compared with experimental data, also supporting weak ferromagnetic behaviors in the system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y4Co3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | unknown |
| Y9Co7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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