We report electron spin resonance (ESR) experiments conducted on oriented powder of the heavy-fermion ferromagnet $\mathrm{Yb}{\left({\mathrm{Rh}}_{0.73}{\mathrm{Co}}_{0.27}\right)}_2{\mathrm{Si}}_2$ in the temperature range 0.75 $\le T\le 4\mathrm{K}$, which includes the transition between the paramagnetic and ferromagnetic ordered phases below the Curie temperature $T_{\mathrm{C}}=1.3\mathrm{K}$. The ESR measurements were performed using a home-built ${}^3\mathrm{He}$ cryostat at $X$-band frequencies. In the ferromagnetic ordered phase the ESR spectra of $\mathrm{Yb}{\left({\mathrm{Rh}}_{0.73}{\mathrm{Co}}_{0.27}\right)}_2{\mathrm{Si}}_2$ are split into two lines. While the resonance in the paramagnetic phase features an easy-plane crystalline electric field induced anisotropy of the $g$ tensor perpendicular to the $c$ axis of the tetragonal crystal structure, the split lines in the ordered phase can be related to ferromagnetic resonance modes with a uniaxial exchange-type anisotropy along the $c$ axis. The corresponding effective anisotropy field can be determined.

Close

PrevNext

View figure in article

• Kondo effect
• Magnetic order
• Magnetism
• Heavy-fermion systems
• Strongly correlated systems
• Electron spin resonance
• Magnetization measurements
• Specific heat measurements