Study of novel quantum magnetism in new geometrically frustrated compounds of hydroxyhalides

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In this research we identified unconventional magnetic transitions in a transition metal hydroxyhalogenide series of deformed pyrochlore compounds M_2(OH)_3X, where M represents a d-electron transition metal magnetic ion such as Cu^<+2>, Ni^<+2>, Co^<+2>, Fe^<+2>, and Mn^<+2>, and X represents halogen ions of Cl^<-1>, Br^<-1>, or I^<-1>. This material category presents a complete series for spins S=1/2 to S=5/2 (S=1/2 for Cu^<+2>, 1 for Ni<+2>, 3/2 for Co^<+2>, 2 for Fe^<+2>, and 5/2 for Mn^<+2>), therefore, we have discovered a unique materials system for the study of geometric frustration in various spin systems.