Structure and Spin-Glass Magnetism of the Fe1.5Ni1.5Ga4 Metallic Alloy
Krishnendu Buxi, Rahul Pan, Zvonko Jagličić, Andreja Jelen, Jože Luzar, Peter Mihor, Stanislav Vrtnik, Primož Koželj, Julia Petrović, Maxim Avdeev, Partha Pratim Jana, Janez Dolinšek
TL;DR
A new metallic alloy, Fe1.5Ni1.5Ga4, was discovered with a unique cubic structure and spin-glass magnetic behavior below 9 K.
Contribution
The discovery of a new phase in the Fe–Ni–Ga system with spin-glass magnetism and a disordered cubic structure.
Findings
Fe1.5Ni1.5Ga4 forms a single-phase cubic material with the Ia3̅d structure.
The alloy exhibits spin-glass behavior below 9 K due to random magnetic moment ordering.
A chiral structural model I4132 cannot be ruled out based on current crystallographic data.
Abstract
The Ga-rich region of the Fe–Ni–Ga ternary system was investigated, by exploring a line of compositions Fe x Ni3–x Ga4, with 0.5 ≤ x ≤ 2.5. The single-phase cubic material was found only at the composition Fe1.5Ni1.5Ga4 and its immediate vicinity, representing a new phase in the Fe–Ni–Ga diagram. The homogeneity range of this phase was estimated by additionally exploring a set of compositions Fe x Ni y Ga z around the central composition Fe1.5Ni1.5Ga4. The structural model was constructed based on the structure of the binary Ni3Ga4 parent phase, which crystallizes in the cubic Ia3̅d space group. We have considered that by substituting Fe for Ni, the Ia3̅d structure is preserved, with the Fe and Ni being statistically distributed at their 48g Wyckoff site. The possibility of a symmetry-reduced chiral structural model I4132 driven by chemical ordering of Fe and Ni cannot be entirely…
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Taxonomy
TopicsMagnetic Properties and Applications · Shape Memory Alloy Transformations · Magnetic properties of thin films