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Colossal Magnetoresistance Without Mn 3+ /Mn 4+ Double Exchange in the Stoichiometric Pyrochlore Tl 2 Mn 2 O 7

descriptionPublicationkeyboard_double_arrow_right Article 05 Jul 1996 English Publisher:American Association for the Advancement of Science (AAAS)Journal:Science, volume 273, pages 81-84 (issn: 0036-8075, eissn: 1095-9203,

Authors: Subramanian, M. A.; Toby, B. H.; Ramirez, A. P.; Marshall, W. J.; Sleight, A. W.; Kwei, G. H.;

doi: 10.1126/science.273.5271.81

pmid: 8688054

Colossal Magnetoresistance Without Mn 3+ /Mn 4+ Double Exchange in the Stoichiometric Pyrochlore Tl 2 Mn 2 O 7

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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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