The intermetallic compound HoNi single crystal has an orthorhombic FeB type crystal structure and magnetic orders at 15K (the temperature magnetic structure changes) and 37K (Curie temperature). We have measured the magnetic properties along c-axis under high pressure up to 1.5GPa with miniature high pressure cell and commercial MPMS. The magnetic transition temperature at 37K decreases 4 K/GPa with increasing pressure. The magnetic field observed the magnetic transition in the temperature range between 15K and 37K becomes lower with increasing pressure.
We have studied the magnetocaloric effect (MCE) of single-crystal HoNi, which shows a ferromagnetic transition at TC = 35 K and a spin-reorientation transition at TSR = 13 K. Below TC, HoNi has ferromagnetic and antiferromagnetic components along the a- and c-axes, respectively. We find that the MCE in HoNi is highly anisotropic owing to the canted magnetic structure of this material. When a magnetic field is applied along the a- (B ∥ a) and b-axes (B ∥ b), the maximum isothermal magnetic-entropy change reaches 22.8 J K−1 kg−1 at 35 K and 18.8 J K−1 kg−1 at 13 K, respectively, when the magnetic field is increased from 0 to 5 T. On the other hand, for B ∥ c, is approximately three times smaller than those for B ∥ a and B ∥ b. In addition, the sign of depends on the temperature owing to the antiferromagnetic component along the c-axis and the existence of a metamagnetic transition.
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