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Temperature and Ag doping effect on magnetic excitations in the quasi-two-dimensional triangular lattice antiferromagnet CuCrO$$_2$$ studied by inelastic neutron scattering

Kajimoto, Ryoichi  ; Nakajima, Kenji  ; Kawamura, Seiko   ; Inamura, Yasuhiro; Kakurai, Kazuhisa; Arai, Masatoshi; Hokazono, Takahisa*; Ozono, Akira*; Okuda, Tetsuji*

We have studied magnetic excitations in quasi two-dimensional triangular lattice antiferromagnets CuCrO$$_2$$ and Cu$$_{0.85}$$Ag$$_{0.15}$$CrO$$_2$$ by inelastic neutron scattering. CuCrO$$_{2}$$ has two types of magnetic excitations: the one is highly dispersive, while the other is less dispersive and spreads over a wide $$Q$$ range. With increasing the temperature, the weight of the latter component transfers to a lower energy, and the spin dynamics becomes a mixture of disordered spin wave and another diffusive component. The Ag doping induces similar spin dynamics even at 5 K. This manifests the impact of the Ag doping on the magnetic correlations and gives a clue to understand the unconventional spin state in the Ag doped CuCrO$$_{2}$$.

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Category:Physics, Multidisciplinary

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