Muon spin relaxation study of manganese hydroxy squarate

Muon spin relaxation has been used to study the magnetic phase transition and spin dynamics above Tc in Mn2(OH)2(C4O4). These studies confirm previous findings of a transition to long range order, providing a more accurate determination of Tc = 12.5 K as well as indicating short range order at temperatures above the phase transition. The muon measurements are insensitive to the presence of a small quantity of manganese carbonate in the sample that tend to dominate bulk magnetic susceptibility experiments.