Probing octupolar hidden order via Janus impurities

Author:

Voleti SreekarORCID,Pradhan Koushik,Bhattacharjee SubhroORCID,Saha-Dasgupta Tanusri,Paramekanti ArunORCID

Abstract

AbstractQuantum 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.

Publisher

Springer Science and Business Media LLC

Subject

Condensed Matter Physics,Electronic, Optical and Magnetic Materials

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