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The quest for Kitaev spin liquids in particular three dimensional solids islong sought goal in condensed matter physics, as these states may give rise toexotic new types of quasi-particle excitations carrying fractional quantumnumbers namely Majorana Fermionic excitations. Here we report the experimentalsignature of this characteristic feature of the Kitaev spin liquid via Ramanmeasurements. Sm2ZnIrO6 is a strongly spin orbit coupled Mott insulator, whereJeff = 1/2 controls the physics, which provide striking evidence for thischaracteristic feature of the Kitaev spin liquid. As the temperature islowered, we find that the spin excitations form a continuum in contrast to theconventional sharp modes expected in ordered antiferromagnets. Our observationof a broad magnetic continuum and anomalous renormalization of the phononself-energy parameters evidence the existence of Majorana fermions from spinfractionalization in double perovskites structure as theoretically conjecturedin a Kitaev-Heisenberg geometrically frustrated double perovskite systems.

Kitaev Magnetism and Fractionalized Excitations in Double Perovskite Sm2ZnIrO6