Abstract
Magnetism in EuNiIn4 is studied using specific heat, magnetic susceptibility, magnetization, 151Eu Mössbauer spectroscopy, and neutron diffraction experiments. The specific heat exhibited two magnetic transitions at TN1 = 15.2 K and TN2 = 14.3 K at zero magnetic field. An antiferromagnetic ground state of EuNiIn4 was observed to have a uniaxial magnetic anisotropy along the b axis using magnetic susceptibility and 151Eu Mössbauer spectroscopy. Further, single crystal neutron diffraction experiments illustrated that this antiferromagnetic structure in the ground state is characterized by the commensurate propagation vector \(\boldsymbol{{q}} = (1/2,1/2,1/2)\), which reveals no distinct anomaly at TN2. The magnetization curve along the b axis at 2 K was observed to exhibit four successive magnetic field-induced transitions up to 50 kOe, following which it increased linearly, resulting in saturated magnetization of 7 μB/f.u. above 195.2 kOe, as expected of Eu2+ free ions. The magnetic phase diagram for H ∥ b in EuNiIn4 was found to have unique characteristics with five magnetic states in low magnetic fields.
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