Temperature-dependent soft x-ray photoemission and absorption studies of charge disproportionation in La1-xSrxFeO3

Journal of the Physical Society of Japan

Volumn 75, Issue 5, 2006, Pages

  Wadati, Hiroki ^a   Chikamatsu, Akira ^b   Hashimoto, Ryuji ^b   Takizawa, Masaru ^a   Kumigashira, Hiroshi ^b   Fujimori, Atsushi ^a   Oshima, Masaharu ^b   Lippmaa, Mikk ^a   Kawasaki, Masashi ^c   Koinuma, Hideomi ^d  

^a UNIVERSITY OF TOKYO   (Japan)

^b Tohoku University   (Japan)

^c TOHOKU UNIVERSITY   (Japan)

^d NATIONAL INSTITUTE FOR MATERIALS SCIENCE   (Japan)

Author keywords

Charge disproportionation; La1 xSrxFeO3; Photoemission spectroscopy; Spectral weight transfer; Temperature dependence; Thin films; Wide insulating region

Indexed keywords

EID: 33646788794     PISSN: 00319015     EISSN: 00319015     Source Type: Journal    
DOI: 10.1143/JPSJ.75.054704     Document Type: Article

References (26)

1. M. Imada, A. Fujimori and Y. Tokura: Rev. Mod. Phys. 70 (1998) 1039.
2. J. M. Tranquada, B. J. Sternlieb, J. D. Axe, Y. Nakamura and S. Uchida: Nature 375 (1995) 561.
3. M. Takano, J. Kawachi, N. Nakanishi and Y. Takeda: J. Solid State Chem. 39 (1981) 75.
4. P. D. Battle, T. C. Gibb and P. Lightfoot: J. Solid State Chem. 84 (1981) 271.
5. J. Q. Li, Y. Matsui, S. K. Park and Y. Tokura: Phys. Rev. Lett. 79 (1997) 297.
6. T. Ishikawa, S. K. Park, T. Katsufuji, T. Arima and Y. Tokura: Phys. Rev. B 58 (1998) R13326.
7. A. E. Bocquet, A. Fujimori, T. Mizokawa, T. Saitoh, H. Namatame, S. Suga, N. Kimizuka, Y. Takeda and M. Takano: Phys. Rev. B 45 (1992) 1561.
8. J. Matsuno, T. Mizokawa, A. Fujimori, K. Mamiya, Y. Takeda, S. Kawasaki and M. Takano: Phys. Rev. B 60 (1999) 4605.
9. S. H. Yoon and C. S. Kim: J. Korean Phys. Soc. 44 (2004) 369.
10. H. Wadati, D. Kobayashi, H. Kumigashira, K. Okazaki, T. Mizokawa, A. Fujimori, K. Horiba, M. Oshima, N. Hamada, M. Lippmaa, M. Kawasaki and H. Koinuma: Phys. Rev. B 71 (2005) 035108.
11. K. Horiba, H. Oguchi, H. Kumigashira, M. Oshima, K. Ono, N. Nakagawa, M. Lippmaa, M. Kawasaki and H. Koinuma: Rev. Sci. Instrum. 74 (2003) 3406.
12. M. Kawasaki, K. Takahashi, T. Maeda, R. Tsuchiya, M. Shinohara, O. Ishihara, T. Yonezawa, M. Yoshimoto and H. Koinuma: Science 266 (1994) 1540.
13. The resistivity measurements were performed by using the samples which had been made under the same condition as those for the photoemission measurements. The samples for the resistivity measurements were grown on Nb-free SrTiO3 substrates to prevent the electric current from flowing through the conducting substrate.
14. J. J. Yeh and I. Lindau: At. Data Nucl. Data Tables 32 (1985) 1.
15. H. Wadati, D. Kobayashi, A. Chikamatsu, R. Hashimoto, M. Takizawa, K. Horiba, H. Kumigashira, T. Mizokawa, A. Fujimori, M. Oshima, M. Lippmaa, M. Kawasaki and H. Koinuma: J. Electron Spectrosc. Relat. Phenom. 144-147 (2005) 877.
16. A. Chainani, T. Yokoya, T. Morimoto, T. Takahashi and S. Todo: Phys. Rev. B 51 (1995) 17976.
17. J.-H. Park, L. H. Tjeng, J. W. Allen, P. Metcalf and C. T. Chen: Phys. Rev. B 55 (1997) 12813.
18. D. Schrupp, M. Sing, M. Tsunekawa, H. Fujiwara, S. Kasai, A. Sekiyama, S. Suga, T. Muro, V. A. M. Brabers and R. Claessen: Europhys. Lett. 70 (2005) 789.
19. D. D. Sarma, N. Shanthi, S. R. Krishnakumar, T. Saitoh, T. Mizokawa, A. Sekiyama, K. Kobayashi, A. Fujimori, E. Weschke, R. Meier, G. Kaindl, Y. Takeda and M. Takano: Phys. Rev. B 53 (1996) 6873.
20. J.-H. Park, C. T. Chen, S.-W. Cheong, W. Bao, G. Meigs, V. Chakarian and Y. U. Idzerda: Phys. Rev. Lett. 76 (1996) 4215.
21. S. Suga, T. Matsushita, M. Tsunekawa, T. Iwasaki, J. Samejima, Y. Kuwata, A. Kimura, A. Sekiyama, A. Fujimori, H. Ishii, T. Miyahara, H. Kuwahara and Y. Tokura: Physica B 237- 238 (1997) 413.
22. A. Chainani, H. Kumigashira, T. Takahashi, Y. Tomioka, H. Kuwahara and Y. Tokura: Phys. Rev. B 56 (1997) R15513.
23. I. Vobornik, L. Perfetti, M. Zacchigna, M. Grioni, G. Margaritondo, J. Mesot, M. Medarde and P. Lacorre: Phys. Rev. B 60 (1999) R8426.
24. K. Okazaki, T. Mizokawa, A. Fujimori, E. V. Sampathkumaran, M. J. Martinez-Lope and J. A. Alonso: Phys. Rev. B 67 (2003) 073101.
25. There seems to be some change with temperature, but the change at 710 eV is not systematic. The change is too small to influence the strong temperature dependence of Fig. 3(a) considering that the 600 eV spectra also show temperature dependence similar to 710 eV spectra. Therefore, we believe that the change of 710 eV spectra reflects the intrinsic change of the Fe 3d PDOS. Moreover, the Fe 2p XAS of LFO (x = 0) also shows a similarly small temperature dependence (not shown), but there is no appreciable change in the 710 eV spectra of LFO [as shown in Fig. 7(a)].
26. The temperature dependence is not caused by a condensation of ice since such a change is not observed for x = 0, 0.2, and 0.4 (Fig. 8) taken under almost the same experimental conditions.