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Spin singlet formation in MgTi2O4: evidence of a helical dimerization pattern.

Abstract:

The transition-metal spinel MgTi2O4 undergoes a metal-insulator (M-I) 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 MgTi2O4, which is found to contain dimers with short Ti-Ti distances (the locations of the spin singlets) alternating with long bonds to form helices. Ba...

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Authors


Schmidt, M More by this author
Ratcliff, W More by this author
Radaelli, PG More by this author
Harrison, NM More by this author
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Journal:
Physical review letters
Volume:
92
Issue:
5
Pages:
056402
Publication date:
2004-02-05
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:43136949-c37d-4206-b211-567a128edd12
Source identifiers:
66275
Local pid:
pubs:66275
Language:
English

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