Unusual magnetic properties of (Er1-xGdx)(5)Si-4 compounds
| Title | Unusual magnetic properties of (Er1-xGdx)(5)Si-4 compounds |
| Publication Type | Journal Article |
| Year of Publication | 2008 |
| Authors | Singh NK, Pecharsky VK, Gschneidner KA |
| Journal Title | Physical Review B |
| Volume | 77 |
| Pages | 054414 |
| Date Published | Feb |
| Type of Article | Article |
| ISBN Number | 1098-0121 |
| Accession Number | ISI:000253764000056 |
| Keywords | alloys, electrical-resistance, field, gd-5(si2ge2), HEAT-CAPACITY, intermetallic compounds, NEEL, rare-earth, refrigeration, temperature, transition |
| Abstract | Magnetic and magnetocaloric properties of polycrystalline (Er1-xGdx)(5)Si-4 with x=0.1 and 0.25 have been studied. The temperature dependencies of the dc magnetization and ac susceptibility indicate two magnetic transitions: the high temperature transitions are antiferromagnetic in character, whereas the low temperature ones are of ferromagnetic nature. The isothermal magnetization of these compounds shows metamagneticlike transitions at 5 K and no saturation in fields up to 70 kOe. Time dependencies of the magnetization data below the Neel temperature exhibit unusually strong relaxation effects with logarithmic time dependence. The ac susceptibility data reveal that magnetic state of these compounds is distinctly different from spin glasses and the relaxation behavior seen in the magnetization data is a consequence of complex magnetic interactions. The existence of complex magnetic interactions leads to an easy formation of field induced short range ferromagnetic correlations in the paramagnetic state and greatly affects both the magnetic and magnetocaloric properties of these compounds. |
| DOI | 10.1103/PhysRevB.77.054414 |
| Alternate Journal | Phys. Rev. B |
