Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 79, Issue 10, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.79.104704
Keywords
zero-gap state; charge order; alpha-(BEDT-TTF)(2)I-3; NMR
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [15073221, 20110002]
- Grants-in-Aid for Scientific Research [15073221] Funding Source: KAKEN
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We performed C-13-NMR measurements in the metallic state of alpha-(BEDT-TTF)(2)I-3 under pressure to determine the local spin susceptibility at each BEDT-TTF molecular site. We found that the local susceptibility becomes quite different from molecule to molecule in a unit cell with approach to the zero-gap state (ZGS) under pressure. This is related to the charge disproportionation among molecular sites [named A (A'), B, and C]. We confirmed that the most/least positively charged site, the B/C molecule, carries the smallest/largest local susceptibility. We also confirmed the linear temperature dependence of the local susceptibility at low temperatures. These results are consistent with the theoretical calculation [Eur. Phys. J. B 67 (2009) 139] and should be considered as the characteristics of the ZGS.
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