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arXiv · 2504.10216

L-point quadrupole order under magnetic field in cubic PrIr$_2$Zn$_{20}$

Hitoko Okanoya·Kazumasa Hattori
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Abstract

We study quadrupole orders in heavy-fermion compound PrIr$_2$Zn$_{20}$ under magnetic fields on the basis of the Landau theory. Assuming $E_g$ electric quadrupolar orders in the cubic symmetry with the ordering wavenumber at the L points in the face-centered cubic lattice Brillouin zone as observed experimentally, we construct a Landau free energy and analyze the resulting free energy. We find that the unidentified high-temperature ordered phase under the magnetic field ${\bf H} \parallel [001]$ reported earlier arises from the rotation of the quadrupole moments of f electrons on the Pr site. We also discuss the phase diagram for other magnetic-field directions and possible double-${\bf q}$ quadrupolar orders in this system.

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Hitoko Okanoya, Kazumasa Hattori. 2025-04-14. L-point quadrupole order under magnetic field in cubic PrIr$_2$Zn$_{20}$. https://doi.org/10.1103/cflz-9y82

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