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Anisotropy of Linear Thermal Expansion and Compressibility of Y 2 Fe 17 Under Pressure and its Correlation to Magnetic Structure |
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| Authors: | Z. Arnold J. Kamarád O. Prokhnenko C. Ritter T. Eto F. Honda |
| Affiliation: | 1. AS CR , Institute of Physics , Na Slovance 2, Praha 8 , 182 21 , Czech Republic;2. AS CR, Laboratory of High pressures , Institute of Physics , Cukrovarnická 10, Prague 6 , 162 53 , Czech Republic E-mail: arnold@fzu.cz;3. AS CR , Institute of Physics , Na Slovance 2, Praha 8 , 182 21 , Czech Republic;4. Institute Laue Langevin , BP 156, Grenoble, Cédex 9 , 38042 , France;5. Institute Laue Langevin , BP 156, Grenoble, Cédex 9 , 38042 , France;6. Kyushu University , Ropponmatsu, Chuo-Ku, Fukuoka , 810-8560 , Japan;7. Kyushu University , Ropponmatsu, Chuo-Ku, Fukuoka , 810-8560 , Japan;8. Department of Electronic Structures , Charles Univ. , Prague 2 , 121 16 , Czech Republic |
| Abstract: | A complex temperature dependence of a.c. susceptibility of Y 2 Fe 17 under high pressures together with recent neutron diffraction studies under pressure proved the instability of the collinear ferromagnetic structure and the development of a non-collinear magnetic arrangement of Fe moments in Y 2 Fe 17 . To study the correlation between magnetic structure and volume in more detail we performed compressibility and linear thermal expansion studies under high pressures up to 100 kbar and 10 kbar, respectively. The compressibility in the paramagnetic state s P (above 10 kbar at room temperature) was determined from the Murnaghan equation of state using the X-ray data, kappa_{P}=0.80 {rm Mbar}^{-1} . The linear thermal expansion and compressibility in the ferromagnetic state at low temperatures are highly anisotropic. As a consequence, the c/a ratio decreases with increasing pressure. The magnetic phase diagram of Y 2 Fe 17 compound was compiled up to 20 kbar. |
| Keywords: | Intermetallic Compounds Pressure Effect Compressibility Thermal Expansion Magnetic Structure Y 2 Fe 17 |