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Spin-Lattice Order in FrustratedZnCr2O4
Ji, S.,Lee, S.-H.,Broholm, C.,Koo, T. Y.,Ratcliff, W.,Cheong, S.-W.,Zschack, P. American Physical Society 2009 Physical Review Letters Vol.103 No.3
<P>Using synchrotron x-ray and neutron diffraction, we disentangle spin-lattice order in highly frustrated ZnCr2O4 where magnetic chromium ions occupy the vertices of regular tetrahedra. Upon cooling below 12.5 K the quandary of antialigning spins surrounding the triangular faces of tetrahedra is resolved by establishing weak interactions on each triangle through an intricate lattice distortion. However, the resulting spin order is not simply a Néel state on strong bonds, but rather a complex coplanar spin structure, indicating that antisymmetric and/or further neighbor exchange interactions also play a role as ZnCr2O4 resolves conflicting magnetic interactions.</P>
Crystal distortions in geometrically frustrated ACr<sub>2</sub>O<sub>4</sub> (A = Zn,Cd)
Lee, S-H,Gasparovic, G,Broholm, C,Matsuda, M,Chung, J-H,Kim, Y J,Ueda, H,Xu, G,Zschack, P,Kakurai, K,Takagi, H,Ratcliff, W,Kim, T H,Cheong, S-W IOP Pub 2007 Journal of Physics, Condensed Matter Vol.19 No.14
<P>In this paper, we discuss neutron and synchrotron x-ray diffraction data obtained from single crystals of ACr<SUB>2</SUB>O<SUB>4</SUB> (A = Zn, Cd). The Cr spinels undergo three-dimensional spin-Peierls transitions at low temperatures that involve cubic-to-tetragonal lattice distortions and magnetic long-range ordering. Our results show that the magnetic structures selected by these systems are closely related to the lattice distortions that are undertaken. </P>