Superconductivity, Weak Itinerant Ferromagnetism and Electronic Band Structure of Y_9Co_7 |
| A. Kołodziejczyka, B. Wiendlochab, R. Zaleckia, J. Tobołab and S. Kaprzykb
aDepartment of Solid State Physics bDepartment of Condensed Matter Physics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland |
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| Received: 14 09 2006; |
| The paper presents experimental results for the intermetallic compound Y9Co7 which is the first very weak itinerant ferromagnetic superconductor. The measurements of electrical resistivity, susceptibility, magnetization, specific heat, nuclear magnetic resonance, and other properties show the magnetic transition at TC ≈ 4.5 K and the onset of superconductivity at about TS ≈ 2.5 K, revealing the coexistence state within a temperature interval below TS. A few of the results are shortly reviewed and discussed. We focus attention on our recent ultraviolet photoemission spectroscopy and their comparison with our band structure calculations. Interpretations are considered which take into account the characteristic structure of the compound and different possible types of magnetic ordering. |
| DOI: 10.12693/APhysPolA.111.513 PACS numbers: 74.25.Jb, 74.25.Ha, 74.20.Mn |