Journal
PHYSICAL REVIEW B
Volume 88, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.075139
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology [20110003]
- Grants-in-Aid for Scientific Research [22224006] Funding Source: KAKEN
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We study the temperature and frequency dependence of the dielectric constant and the ac conductivity in the dimer Mott insulator family beta'-type Pd(dmit)(2) (where dmit denotes 1,3-dithiole-2-thione-4,5-dithiolate). We find that all compounds within this family have relaxorlike dielectric relaxation with a Curie-Weiss increase in the dielectric constant with decreasing temperature. An analysis of the dielectric data shows a clear relation between electronic correlation and the dipole-dipole interaction; also, geometrical frustration appears to weaken this interaction. Furthermore, the dc and ac conductivities are shown to be closely correlated and follow the same universal ac conductivity as disordered solids.
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