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Structural trends and itinerant magnetism of the new cage-structured compound HfMn2Zn20
Nusrat Yasmin1, Md Fahel Bin Noor1, Tiglet Besara1
1Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO 65897, United States of America.
Abstract:
A new cage-structured compound-HfMn2Zn20-belonging to theAB2C20(A, B= transition or rare earth metals, andC= Al, Zn, or Cd) family of structures has been synthesized via the self-flux method. The new compound crystallizes in the space groupFd3¯mwith lattice parametera≈ 14.0543(2) Å (Z= 8) and exhibits non-stoichiometry due to Mn/Zn mixing on the Mn-site and an underoccupied Hf-site. The structure refines to Hf0.93Mn1.63Zn20.37and follows lattice size trends when compared to other HfM2Zn20(M= Fe, Co, and Ni) structures. The magnetic measurements show that this compound displays a modified Curie-Weiss behavior with a transition temperature around 22 K. The magnetization shows no saturation, a small magnetic moment, and near negligible hysteresis, all signs of itinerant magnetism. The Rhodes-Wohlfarth ratio and the spin fluctuation parameters ratio both confirm the itinerant nature of the magnetism in HfMn2Zn20.
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