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Spin singlet formation in MgTi$_2$O$_4$: evidence of a helical dimerization pattern | M. Schmidt
; W. Ratcliff II
; P. G. Radaelli
; K. Refson
; N. M. Harrison
; S.W. Cheong
; | Date: |
6 Aug 2003 | Subject: | cond-mat | Abstract: | The transition metal spinel MgTi$_2$O$_4$ undergoes a metal-insulator transition on cooling below $T_{M-I} = 260$ K. A sharp reduction of the magnetic susceptibility below $T_{M-I}$ suggests the onset of a magnetic singlet state. Using high-resolution synchrotron and neutron powder diffraction, we have solved the low-temperature crystal structure of MgTi$_2$O$_4$, which is found to contain dimers with short Ti-Ti distances (the locations of the spin singlets) alternating with long bonds to form helices. Band structure calculations based on hybrid exchange density functional theory show that, at low temperatures, MgTi$_2$O$_4$ is an orbitally ordered band insulator. | Source: | arXiv, cond-mat/0308101 | Services: | Forum | Review | PDF | Favorites |
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