Anomalous state sandwiched between fermi liquid and charge ordered mott-insulating phases of Ti4O7

M. Taguchi; A. Chainani; M. Matsunami; R. Eguchi; Y. Takata; M. Yabashi; K. Tamasaku; Y. Nishino; T. Ishikawa; S. Tsuda; S. Watanabe; C. T. Chen; Y. Senba; H. Ohashi; K. Fujiwara; Y. Nakamura; H. Takagi; S. Shin

doi:10.1103/PhysRevLett.104.106401

Anomalous state sandwiched between fermi liquid and charge ordered mott-insulating phases of Ti4O7

M. Taguchi, A. Chainani, M. Matsunami, R. Eguchi, Y. Takata, M. Yabashi, K. Tamasaku, Y. Nishino, T. Ishikawa, S. Tsuda, S. Watanabe, C. T. Chen, Y. Senba, H. Ohashi, K. Fujiwara, Y. Nakamura, H. Takagi, S. Shin

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Abstract

The Magnéli phase Ti4O7 exhibits two sharp jumps in resistivity with coupled structural transitions as a function of temperature at Tc1∼142K and Tc2=154K. We have studied electronic structure changes across the two transitions using 7 eV laser, soft x-ray, and hard x-ray (HX) photoemission spectroscopy (PES). Ti 2p-3d resonant PES and HX PES show a clear metallic Fermi edge and mixed valency above Tc2. The low temperature phase below Tc1 shows a clear insulating gap of ∼100meV. The intermediate phase between Tc1 and Tc2 indicates a pseudogap coexisting with remnant coherent states. HX PES and complementary calculations have confirmed the coherent screening in the strongly correlated intermediate phase. The results suggest the existence of a highly anomalous state sandwiched between the mixed-valent Fermi liquid and charge ordered Mott-insulating phase in Ti4O7.

Original language	English
Article number	106401
Journal	Physical Review Letters
Volume	104
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.104.106401
Publication status	Published - Mar 8 2010
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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Taguchi, M., Chainani, A., Matsunami, M., Eguchi, R., Takata, Y., Yabashi, M., Tamasaku, K., Nishino, Y., Ishikawa, T., Tsuda, S., Watanabe, S., Chen, C. T., Senba, Y., Ohashi, H., Fujiwara, K., Nakamura, Y., Takagi, H., & Shin, S. (2010). Anomalous state sandwiched between fermi liquid and charge ordered mott-insulating phases of Ti4O7. Physical Review Letters, 104(10), [106401]. https://doi.org/10.1103/PhysRevLett.104.106401

Taguchi, M, Chainani, A, Matsunami, M, Eguchi, R, Takata, Y, Yabashi, M, Tamasaku, K, Nishino, Y, Ishikawa, T, Tsuda, S, Watanabe, S, Chen, CT, Senba, Y, Ohashi, H, Fujiwara, K, Nakamura, Y, Takagi, H & Shin, S 2010, 'Anomalous state sandwiched between fermi liquid and charge ordered mott-insulating phases of Ti4O7', Physical Review Letters, vol. 104, no. 10, 106401. https://doi.org/10.1103/PhysRevLett.104.106401

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title = "Anomalous state sandwiched between fermi liquid and charge ordered mott-insulating phases of Ti4O7",

abstract = "The Magn{\'e}li phase Ti4O7 exhibits two sharp jumps in resistivity with coupled structural transitions as a function of temperature at Tc1∼142K and Tc2=154K. We have studied electronic structure changes across the two transitions using 7 eV laser, soft x-ray, and hard x-ray (HX) photoemission spectroscopy (PES). Ti 2p-3d resonant PES and HX PES show a clear metallic Fermi edge and mixed valency above Tc2. The low temperature phase below Tc1 shows a clear insulating gap of ∼100meV. The intermediate phase between Tc1 and Tc2 indicates a pseudogap coexisting with remnant coherent states. HX PES and complementary calculations have confirmed the coherent screening in the strongly correlated intermediate phase. The results suggest the existence of a highly anomalous state sandwiched between the mixed-valent Fermi liquid and charge ordered Mott-insulating phase in Ti4O7.",

author = "M. Taguchi and A. Chainani and M. Matsunami and R. Eguchi and Y. Takata and M. Yabashi and K. Tamasaku and Y. Nishino and T. Ishikawa and S. Tsuda and S. Watanabe and Chen, {C. T.} and Y. Senba and H. Ohashi and K. Fujiwara and Y. Nakamura and H. Takagi and S. Shin",

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doi = "10.1103/PhysRevLett.104.106401",

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AU - Taguchi, M.

AU - Chainani, A.

AU - Matsunami, M.

AU - Eguchi, R.

AU - Takata, Y.

AU - Yabashi, M.

AU - Tamasaku, K.

AU - Nishino, Y.

AU - Ishikawa, T.

AU - Tsuda, S.

AU - Watanabe, S.

AU - Chen, C. T.

AU - Senba, Y.

AU - Ohashi, H.

AU - Fujiwara, K.

AU - Nakamura, Y.

AU - Takagi, H.

AU - Shin, S.

PY - 2010/3/8

Y1 - 2010/3/8

N2 - The Magnéli phase Ti4O7 exhibits two sharp jumps in resistivity with coupled structural transitions as a function of temperature at Tc1∼142K and Tc2=154K. We have studied electronic structure changes across the two transitions using 7 eV laser, soft x-ray, and hard x-ray (HX) photoemission spectroscopy (PES). Ti 2p-3d resonant PES and HX PES show a clear metallic Fermi edge and mixed valency above Tc2. The low temperature phase below Tc1 shows a clear insulating gap of ∼100meV. The intermediate phase between Tc1 and Tc2 indicates a pseudogap coexisting with remnant coherent states. HX PES and complementary calculations have confirmed the coherent screening in the strongly correlated intermediate phase. The results suggest the existence of a highly anomalous state sandwiched between the mixed-valent Fermi liquid and charge ordered Mott-insulating phase in Ti4O7.

AB - The Magnéli phase Ti4O7 exhibits two sharp jumps in resistivity with coupled structural transitions as a function of temperature at Tc1∼142K and Tc2=154K. We have studied electronic structure changes across the two transitions using 7 eV laser, soft x-ray, and hard x-ray (HX) photoemission spectroscopy (PES). Ti 2p-3d resonant PES and HX PES show a clear metallic Fermi edge and mixed valency above Tc2. The low temperature phase below Tc1 shows a clear insulating gap of ∼100meV. The intermediate phase between Tc1 and Tc2 indicates a pseudogap coexisting with remnant coherent states. HX PES and complementary calculations have confirmed the coherent screening in the strongly correlated intermediate phase. The results suggest the existence of a highly anomalous state sandwiched between the mixed-valent Fermi liquid and charge ordered Mott-insulating phase in Ti4O7.

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Anomalous state sandwiched between fermi liquid and charge ordered mott-insulating phases of Ti4O7

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