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- Title
Probing octupolar hidden order via Janus impurities.
- Authors
Voleti, Sreekar; Pradhan, Koushik; Bhattacharjee, Subhro; Saha-Dasgupta, Tanusri; Paramekanti, Arun
- Abstract
Quantum materials with non-Kramers doublets are a fascinating venue to realize multipolar hidden orders. Impurity probes which break point group symmetries, such as implanted muons or substitutional impurities, split the non-Kramers degeneracy and exhibit a Janus-faced influence in such systems: they can destroy the very order they seek to probe. Here, we explore this duality in cubic osmate double perovskites which are candidates for exotic d-orbital octupolar order competing with quadrupolar states. Using ab initio computations, Landau theory, and Monte Carlo simulations, we show that Janus impurities induce local strain fields, nucleating quadrupolar puddles and suppressing the octupolar Tc. At the same time, strains mix the non-Kramers doublet with an excited magnetic triplet, creating parasitic dipole moments which directly expose the hidden octupolar order parameter. Our work unravels this Janus duality in recent impurity nuclear magnetic resonance (NMR) experiments, with important implications for uncovering hidden order in diverse multipolar materials.
- Subjects
MAGNETIC dipoles; MONTE Carlo method; NUCLEAR magnetic resonance; DIPOLE moments; LANDAU theory; NUCLEAR magnetic resonance spectroscopy
- Publication
NPJ Quantum Materials, 2023, Vol 8, Issue 1, p1
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-023-00575-6