Abstract
We investigate the magnetic phase transition in UNi 4B by specific heat, c( T), thermal expansion and resistivity under pressure. These experiments reveal that the hexagonal symmetry is not broken at T N = 20 K, and predicts a hydrostatic pressure dependence of T N of − 29 mK/kbar, close to the result from resistivity. The anomalous upturn of c/ T to 470 mJ/mol K 2 at 0.4 K is reduced to 160 mJ/mol K 2 in 16 T ∥ b-axis. The specific heat critical exponent α = −0.15(2) suggests 3D Heisenberg universality in zero field.
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