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• W3100987023 abstract "The spin dynamics and magnetic excitations of the slightly distorted triangular s = 3/2 system alpha-CaCr2O4 are investigated by means of Raman spectroscopy and electron spin resonance (ESR) to elucidate its peculiar magnetic properties. Two-magnon excitations in circular RL symmetry show a multi-maximum structure with a dominant spectral weight at low energies. The temperature dependence of the ESR linewidth is described by a critical broadening DeltaHpp(T) ~ (T - T_N)^{-p} with the exponent p = 0.30(3) - 0.38(5) for temperatures above T_N = 42.6 K. The exponent is much smaller than that of other s = 3/2 triangular lattices. This is ascribed to soft roton-like modes, indicative of the instability of a helical 120{deg} phase. As an origin we discuss a complex spin topology formed by four inequivalent nearest neighbor and sizable next-nearest neighbor interactions." @default.
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• W3100987023 date "2012-10-08" @default.
• W3100987023 modified "2023-09-27" @default.
• W3100987023 title "Softened magnetic excitations in the<i>s</i>= 3/2 distorted triangular antiferromagnet α-CaCr₂O₄" @default.
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• W3100987023 doi "https://doi.org/10.1088/0953-8984/24/43/435604" @default.
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