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Gd6FeBi2 is reported as the only one room-temperature magnet with a Curietemperature (Tc) of ca. 350 K among more than hundreds of compounds with itsstructural type, which makes it more attractive in potential applications. Toreveal the origin of such high ordering temperature, critical behaviors,electronic structure and crystal-field effects of Gd6FeBi2 are investigated inthis work. The short-range Gd-Fe ferrimagnetic interaction is supported by thenon-Curie-Weiss paramagnetic behavior, crystal and electronic structureanalyses, in agreement with previous DFT calculations. Unlike the strong TM-TMexchange interactions, the Gd-Fe exchange interaction shows limited influenceon the critical exponents determined by long-range exchange interactions, whichseems a common feature in RE-TM based alloys without TM-TM exchangeinteractions. However, the strong Gd-Fe hybridization reduces the influence ofvibronic couplings on the short-range exchange interaction and thus allows ahigh Tc. The broadening or splitting mechanism of Gd 4f-electron bands isaddressed based on crystal-field analysis and likely another factor forelevated Tc in Gd6FeBi2 and Gd-based compounds with non-magnetic elements.Different magnetic behaviors among isostructural compounds, and therelationship between the band splitting and crystal-field effects is alsodiscussed.

Understanding high ordering temperature in Gd$_6$FeBi$_2$ magnet: critical behavior, electronic structure and crystal-field analysis