Magnetic phase transitions and ferromagnetic short-range correlations in single-crystal Tb5Si2.2Ge1.8
| Title | Magnetic phase transitions and ferromagnetic short-range correlations in single-crystal Tb5Si2.2Ge1.8 |
| Publication Type | Journal Article |
| Year of Publication | 2008 |
| Authors | Zou M, Pecharsky VK, Gschneidner KA, Schlagel DL, Lograsso TA |
| Journal Title | Physical Review B |
| Volume | 78 |
| Pages | 014435 |
| Date Published | Jul |
| Type of Article | Article |
| ISBN Number | 1098-0121 |
| Accession Number | ISI:000258190000094 |
| Keywords | gd-5(sixge1-x)(4) |
| Abstract | Magnetic phase transitions in a Tb5Si2.2Ge1.8 single crystal have been studied as a function of temperature and magnetic field. Magnetic-field dependencies of the critical temperatures are highly anisotropic for both the main magnetic ordering process occurring around 120 K and a spin reorientation transition at similar to 70 K. Magnetic-field-induced phase transitions occur with the magnetic field applied isothermally along the a and b axes (but not along the c axis) between 1.8 and 70 K in fields below 70 kOe. Strong anisotropic thermal irreversibility is observed in the Griffiths phase regime between 120 and 200 K with applied fields ranging from 10 to 1000 Oe. Our data (1) show that the magnetic and structural phase transitions around 120 K are narrowly decoupled; (2) uncover the anisotropy of ferromagnetic short-range order in the Griffiths phase; and (3) reveal some unusual magnetic domain effects in the long-range ordered state of the Tb5Si2.2Ge1.8 compound. The temperature-magnetic field phase diagrams with field applied along the three major crystallographic directions have been constructed. |
| DOI | 10.1103/PhysRevB.78.014435 |
| Alternate Journal | Phys. Rev. B |
