Putative quantum critical point in the itinerant magnet ZrFe${}_4$Si${}_2$ with a frustrated quasi-one-dimensional structure

Abstract

The Fe sublattice in the compound ZrFe${}_4$Si${}_2$ features geometrical frustration and quasi-one-dimensionality. We therefore investigated the magnetic behavior in ZrFe${}_4$Si${}_2$ and its evolution upon substituting Ge for Si and under the application of hydrostatic pressure using structural, magnetic, thermodynamic, and electrical-transport probes. Magnetic measurements reveal that ZrFe${}_4$Si${}_2$ holds paramagnetic Fe moments with an effective moment ${\mu }_{\mathrm{eff}}=2.18{\mu }_B$. At low temperatures the compound shows a weak short-range magnetic order below 6 K. Our studies demonstrate that substituting Ge for Si increases the unit-cell volume and stabilizes the short-range order into a long-range spin-density wave type magnetic order. On the other hand, hydrostatic pressure studies using electrical-resistivity measurements on ZrFe${}_4$(Si${}_{0.88}$Ge${}_{0.12}$)${}_2$ indicate a continuous suppression of the magnetic ordering upon increasing pressure. Therefore, our combined chemical substitution and hydrostatic pressure studies suggest the existence of a lattice-volume-controlled quantum critical point in ZrFe${}_4$Si${}_2$.

arXiv comment9 pages, 7 figures, Published version with new title and extended discussion

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Cited by in corpus (1)

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