On the stability of the ferromagnetic state in the Kondo-lattice compound YbNiSn under high pressure

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Abstract
The effect of pressure on the electrical resistance R(T,p) (where and ) and the lattice parameters (p 26.4 GPa at T = 300 K) of the ferromagnetic Kondo-lattice compound YbNiSn ( = 5.5 K at ambient pressure) has been investigated using the diamond anvil cell technique. The x-ray diffraction data show a smooth decrease of the lattice parameters upon increasing pressure, indicating no structural phase transition up to 26.4 GPa. R(T,p) measurements show for GPa the same pressure dependence of as obtained from very recent high-pressure ac susceptibility () measurements. However, unlike for the measurements, where the ferromagnetic signal is lost for pressures GPa, we find an almost pressure-independent value of in the pressure range GPa, i.e. no indication of a discontinuous change of the type of magnetic order is observed at p = 9.4 GPa. We further discuss the correlation between the pressure dependence of and that of the characteristic temperature of crystal-electric-field effects .