Biotemplated synthesis of superconducting plate-like YBa2Cu3O7−δ using oligosaccharides

► Y123 superconductors as plate-like crystals. ► Improved critical current density through change in morphology. ► High purity biopolymers enables growth of sub-micron superconductors. ► Morphological control of complex oxide demonstrated in short-chained biomolecules.