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Colossal Magnetoresistance Without Mn 3+ /Mn 4+ Double Exchange in the Stoichiometric Pyrochlore Tl 2 Mn 2 O 7
Abstract
Structural analysis from powder neutron and single-crystal x-ray diffraction data for a sample of the Tl 2 Mn 2 O 7 pyrochlore, which exhibits colossal magnetoresistance (CMR), shows no deviations from ideal stoichiometry. This analysis gives an Mn-O distance of 1.90 angstroms, which is significantly shorter than the Mn-O distances (1.94 to 2.00 angstroms) observed in phases based on LaMnO 3 perovskites that exhibit CMR. Both results in Tl 2 Mn 2 O 7 indicate oxidation states very close to Tl 3+ 2 Mn 4+ 2 O 7 . Thus, Tl 2 Mn 2 O 7 has neither mixed valence for a double-exchange magnetic interaction nor a Jahn-Teller cation such as Mn 3+ , both of which were thought to have an important function in CMR materials. An alternate mechanism for CMR in Tl 2 Mn 2 O 7 based on magnetic ordering driven by superexchange and strong spin-fluctuation scattering above the Curie temperature is proposed here.
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Shannon, R. D. (1976) · Acta Crystallographica Section A · doi:10.1107/s0567739476001551 · Cited by 66,145
Cited by
Colossal magnetoresistance in Cr-based chalcogenide spinels
Ramirez, A. P., Cava, R. J., & Krajewski, J. (1997) · Nature · doi:10.1038/386156a0 · Cited by 462
Self-citationThe prediction of inorganic crystal structures using a genetic algorithm and energy minimisation
Woodley, S. M., Battle, P. D., Gale, J. D., & Richard A. Catlow, C. (1999) · Physical Chemistry Chemical Physics · doi:10.1039/a901227c · Cited by 355
Metadata
- Authors
- Subramanian, M. A., Toby, B. H., Ramirez, A. P., Marshall, W. J., Sleight, A. W., & Kwei, G. H.
- Venue
- Science
- Published
- 1996-07-05
- Volume
- 273
- Issue
- 5271
- Pages
- 81-84
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2045323243
- Cited by
- 329
- References
- 1
- FWCI
- 23.77
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Colossal Magnetoresistance Without Mn 3+ /Mn 4+ Double Exchange in the Stoichiometric Pyrochlore Tl 2 Mn 2 O 7. https://app.cochat.ai/papers/10.1126/science.273.5271.81
- The paper
- Subramanian, M. A., Toby, B. H., Ramirez, A. P., Marshall, W. J., Sleight, A. W., & Kwei, G. H. (1996). Colossal Magnetoresistance Without Mn 3+ /Mn 4+ Double Exchange in the Stoichiometric Pyrochlore Tl 2 Mn 2 O 7. Science. https://doi.org/10.1126/science.273.5271.81
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