2016年2月
Two different ground states in K-intercalated polyacenes
PHYSICAL REVIEW B
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- 巻
- 93
- 号
- 7
- 開始ページ
- 075130
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.93.075130
- 出版者・発行元
- AMER PHYSICAL SOC
The electronic states of potassium- (K-) intercalated zigzag-type polycyclic aromatic (PLA) hydrocarbon [polyacene PLAs] K-x (PLAs) are studied for a series of the four smallest molecules: naphthalene (NN), anthracene (AN), tetracene (TN), and pentacene (PN), focusing on their 1:1 stoichiometric phases. Clear experimental differences are identified between the first group [K-1(NN) and K-1(AN)] and the second group [K1(TN) and K-1(PN)] by magnetic, vibrational, and optical measurements. The first group is categorized as a Mott insulator with an antiferromagnetic ground state with energy of similar to 10 meV, whereas the second group is classified as a band insulator via dimer formation due to the spin Peierls instability. In the latter system, the first thermally accessible triplet states are located far apart from the singlet ground states and are not detected by electron spin-resonance spectroscopy until 300 K being very different from what is observed for the hole-doped PN reported earlier. The results give a new systematic understanding on the electronic states of electron-doped PLAs sensitive to the energetic balance among on-site Coulomb repulsion, bandwidth, and the Peierls instability.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.93.075130
- ISSN : 2469-9950
- eISSN : 2469-9969
- Web of Science ID : WOS:000370245200003