We report the measurements of electrical resistivity ρ under various pressures for the single crystal of a heavy-fermion compound YbAgGe. This compound undergoes two magnetic phase transitions at TM1=0.8K (second order) and TM2=0.65K (first order). With applying pressure above 0.5 GPa, the resistive anomalies at TM1 and TM2 merge into a sharp drop at TM. In the range 0.5<P<1.5GPa, TM is constant, whereas the concomitant increase of ρ(0.5K) suggests the development of spin fluctuations. For P>1.5GPa, ρ(0.5K) largely decreases and the anomaly in ρ(T=TM) becomes broader and shifts to higher temperatures. These significant changes at 1.5 GPa suggest a transition from a small-moment ordered state to a stable magnetic state with suppressed spin fluctuations.
- Heavy-fermion compound
- Pressure effect
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering