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  • Title: Statics and dynamics of incommensurate spin order in a geometrically frustrated antiferromagnet CdCr2O4.
    Author: Chung JH, Matsuda M, Lee SH, Kakurai K, Ueda H, Sato TJ, Takagi H, Hong KP, Park S.
    Journal: Phys Rev Lett; 2005 Dec 09; 95(24):247204. PubMed ID: 16384420.
    Abstract:
    Using elastic and inelastic neutron scattering we show that a cubic spinel, CdCr2O4, undergoes an elongation along the c axis (c > a = b) at its spin-Peierls-like phase transition at T(N) = 7.8 K. The Néel phase (T < T(N)) has an incommensurate spin structure with a characteristic wave vector Q(M) = (0, delta,1) with delta approximately 0.09 and with spins lying on the ac plane. This is in stark contrast to another well-known Cr-based spinel, ZnCr2O4, that undergoes a c-axis contraction and a commensurate spin order. The magnetic excitation of the incommensurate Néel state has a weak anisotropy gap of 0.6 meV and it consists of at least three bands extending up to 5 meV.
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