Spin-glass-like behavior in hollandite Ba1+δMn8O16 nanoribbons synthesized by molten-salt method

► Mixed valent manganites have long been the focus of scientific investigations due to the discovery of original tunnel structures and distinctive magneto-electronic properties, especially, the colossal magnetoresisitive (CMR) effect, and potential applications in magnetic sensing and recording devices. ► Although most studies have been of thin films or bulk single crystals, preparation of these materials in a 1D form could widen the range of properties and applications. ► In this manuscript, single-crystal hollandite-type manganese oxides Ba1+δMn8O16 nanoribbons were synthesized by a simple molten-salt method (width of 30-500 nm and up to several hundred micrometers long). ► Magnetic properties of the nanoribbons are measured in the temperature range of 2-300 K. ► At 43 K a rapid increase of magnetization is observed; the zero field-cooled (ZFC) and field-cooled (FC) magnetization curves diverge below this temperature with a sharp cusp around 26 K in the ZFC curve revealing spin-glass-like behavior in the Ba1+δMn8O16 nanoribbons. ► Measurements of ac-susceptibility indicate the coexistence of a weak ferromagnetic phase with a spin-glass-like component in the nanoribbons, which is distinct from the canted antiferromagnetic state found in the counterpart bulk sample.