Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 82, Issue 2, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.82.023706
Keywords
magnetoresistance; pyrochlore oxides; Nd2Ir2O7; metal-insulator transition; Eu2Ir2O7; Gd2Ir2O7
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [23540417, 23340096]
- [19052005]
- [21102518]
- Grants-in-Aid for Scientific Research [23340096, 23540417, 23550065] Funding Source: KAKEN
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We investigated the magnetoresistance (MR) effect of the pyrochlore oxide Nd2Ir2O7, which shows a metal-insulator transition at T-MI = 33 K. A small positive MR effect was observed in the metallic state above TMI, while a large negative MR effect was observed in the insulating state below TMI. MR effects ([rho(B = 0) - rho(B)]/rho(B)) exceeding 3000% were found at 1K at a field of 9 T. As a result, we confirmed the crossover from the insulating state to a state with a small or partial band gap in a field up to 56 T. Furthermore, from the MR effect in Eu2Ir2O7 (T-MI = 120 K) and Gd2Ir2O7 (T-MI = 127 K), we revealed that the large negative MR effect of the pyrochlore iridate Ln(2)Ir(2)O(7) depends on the magnetism of the lanthanide Ln(3+) ion. The d-f interaction plays a significant role in the large negative MR effect in the insulating state.
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