Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-07-02
Nature Physics Vol. 3, 397 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
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.
Inami Takeo
Katsumata Katsurou
Kikkawa Akiko
Lee Hong Seok
Matsuda Makoto
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