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Magnetic properties of A2BB'O6 (A = rare or alkaline earth ions; B,B' =transition metal ions) double perovskites are of great interest due to theirpotential spintronic applications. Particularly fascinating is the zero fieldcooled exchange bias (ZEB) effect observed for the hole doped La2-xAxCoMnO6polycrystalline samples. In this work we synthesize La2CoMnO6,La1.5Ca0.5CoMnO6, and La1.5Sr0.5CoMnO6 single crystals by the floating zonemethod and study their magnetic behavior. The three materials areferromagnetic. Surprisingly, we observe no zero or even conventional exchangebias effect for the Ca and Sr doped single crystals, in sharp contrast topolycrystalline samples. This absence indicates that the lack of grainboundaries and spin glass-like behavior, not observed in our samples, might bekey ingredients for the spontaneous exchange bias phenomena seen inpolycrystalline samples.

Absence of zero-field-cooled exchange bias effect in single crystalline La2-xAxCoMnO6 (A = Ca, Sr) compounds