NUCLEAR AND MAGNETIC MEDIUM-RANGE ORDER IN AMORPHOUS TB67ZR33 CONTAINING HYDROGEN

Small angle neutron scattering (SANS) measurements have been carried out on amorphous Tb67Zr33 containing hydrogen. A zero-field cooled sample is studied at room temperature in the paramagnetic state and at low temperature in the magnetically ordered state. Nuclear medium range order (MRO) is observed and is consistent with a variation of sample composition and a local variation of the amount of hydrogen trapped in the sample. Magnetic MRO correlated with nuclear MRO displays weak variations over large distances (approximately 10(2) nm) and a strong local variation (approximately 2 nm). A comparison is made between the SANS results and the characteristic magnetic temperatures as obtained from classical magnetic measurements for Tb67Zr33 and Tb65Cu35 amorphous alloys.