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Spin-lattice instability to a fractional magnetization state in the
spinel HgCr2O4 | | M. Matsuda
; H. Ueda
; A. Kikkawa
; Y. Tanaka
; K. Katsumata
; Y. Narumi
; T. Inami
; Y. Ueda
; S.-H. Lee
; | | Date: |
2 Jul 2007 | | Abstract: | Magnetic systems are fertile ground for the emergence of exotic states when
the magnetic interactions cannot be satisfied simultaneously due to the
topology of the lattice - a situation known as geometrical frustration.
Spinels, AB2O4, can realize the most highly frustrated network of
corner-sharing tetrahedra. Several novel states have been discovered in
spinels, such as composite spin clusters and novel charge-ordered states. Here
we use neutron and synchrotron X-ray scattering to characterize the fractional
magnetization state of HgCr2O4 under an external magnetic field, H. When the
field is applied in its Neel ground state, a phase transition occurs at H ~ 10
Tesla at which each tetrahedron changes from a canted Neel state to a
fractional spin state with the total spin, Stet, of S/2 and the lattice
undergoes orthorhombic to cubic symmetry change. Our results provide the
microscopic one-to-one correspondence between the spin state and the lattice
distortion. | | Source: | arXiv, arxiv.0707.0280 | | Services: | Forum | Review | PDF | Favorites | |
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