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Uncompensated antiferromagnetic structure of Ho2Ni2Pb


Mydosh,  J. A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Prokeš, K., Muñoz Sandoval, E., Chinchure, A. D., & Mydosh, J. A. (2005). Uncompensated antiferromagnetic structure of Ho2Ni2Pb. The European Physical Journal B, Condensend Matter Physics, 43(2), 163-174. doi:10.1140/epjb/e2005-00039-1.

We have studied the magnetic structure of the orthorhombic compound Ho2Ni2Pb by means of neutron diffraction in zero field and in magnetic fields up to 4.5 T. Both powder and single-crystalline samples were used. Previous bulk measurements suggest two distinct magnetic phase transitions: one at TN = 7.0 K and the other at 4.8 K. Our neutron diffraction measurements, which were made in the range 1.5-20 K, showed that Ho2Ni2Pb has a collinear magnetic structure with unequal number of up and down Ho moments that are aligned parallel and antiparallel to the c axis. At the lowest temperatures the Ho moments are equal in size, each 8.3 μB in agreement with magnetization data. The magnetic structure can be described as having a 5a ×b ×c magnetic unit cell. Below Ts = 3.0 K the structure is squared up. A smooth development of all the magnetic moment magnitudes indicates that the magnetic structure remains in principle the same over the whole temperature range, the “phase transition” around 4.8 K can be identified as an inflection point in the temperature dependence of one of the Ho moments. With increasing temperature there is a clear development towards a simple transverse sine-wave modulated magnetic structure that is established just below TN.