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Magnetic and nonmagnetic impurity effect on magnetic orderings of the isosceles-triangular-lattice antiferromagnet CuMnO$$_2$$

Terada, Noriki*; Tsuchiya, Yoshinori*; Kitazawa, Hideaki*; Metoki, Naoto   

We have investigated magnetic and nonmagnetic impurity substitution effects on magnetic ordering of a frustrated isosceles triangular lattice antiferromagnet CuMnO$$_2$$ by means of the magnetic neutron diffraction measurements on Cu(Mn$$_{1-y}$$Ga$$_y$$)O$$_2$$. While the magnetic wave vector of the magnetic ground state of "magnetically" substituted Cu(Mn$$_{1-x}$$Cu$$_x$$)O$$_2$$ with x = 0:04 is Q = (-1/2 1/2 0), that in the "nonmagnetically" substituted Cu(Mn$$_{1-y}$$Ga$$_y$$)O$$_2$$ with y =0.05, 0.15 and 0.20 is Q = (-1/2 1/2 1/2) that is identical to that of pure CuMnO$$_2$$. We discuss an influence of magnetic or nonmagnetic impurity substitution on the magnetic ordering of CuMnO$$_2$$, by comparing the results of Cu(Mn$$_{1-y}$$Ga$$_y$$)O$$_2$$ with Cu(Mn$$_{1-x}$$Cux)O$$_2$$.



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Category:Physics, Multidisciplinary



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