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1. J. G. Bednorz and K. A. Müller, “Possible high $T_c$ superconductivity in the Ba-La-Cu-O system,” Zeitschrift für Physik B, vol. 64, no. 2, pp. 189–193, 1986. View at Publisher · View at Google Scholar · View at Scopus
2. Y. Kamihara, T. Watanabe, M. Hirano, and H. Hosono, “Iron-based layered superconductor $\text{La}[{\text{O}}_{1-x}{\text{F}}_x]\text{FeAs}$$(x=0.05-0.12)$ with $T_c=26$ K,” Journal of the American Chemical Society, vol. 130, no. 11, pp. 3296–3297, 2008. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
3. C. Fang, H. Yao, W.-F. Tsai, J. Hu, and S. A. Kivelson, “Theory of electron nematic order in LaFeAsO,” Physical Review B, vol. 77, no. 22, Article ID 224509, 2008. View at Publisher · View at Google Scholar · View at Scopus
4. P. W. Anderson, The Theory of Superconductivity in the Cuprates, Princeton University Press, Princeton, NJ, USA, 1997.
5. W. Malaeb, T. Yoshida, T. Kataoka, et al., “Electronic structure and electron correlation in ${\text{LaFeAsO}}_{1-x}{\text{F}}_x$ and ${\text{LaFePO}}_{1-x}{\text{F}}_x$,” Journal of the Physical Society of Japan, vol. 77, no. 9, Article ID 093714, 2008. View at Publisher · View at Google Scholar · View at Scopus
6. M. Hiraishi, R. Kadono, S. Takeshita, et al., “Full gap superconductivity in ${\text{Ba}}_{0.6}{\text{K}}_{0.4}{\text{Fe}}_2{\text{As}}_2$ probed by muon spin rotation,” Journal of the Physical Society of Japan, vol. 78, no. 2, Article ID 023710, 2009. View at Publisher · View at Google Scholar · View at Scopus
7. A. S. Alexandrov, “Phase separation of electrons strongly coupled with phonons in cuprates and manganites,” Journal of Superconductivity and Novel Magnetism, vol. 22, no. 2, pp. 95–101, 2009. View at Publisher · View at Google Scholar · View at Scopus
8. N. Mannella, W. L. Yang, K. Tanaka, et al., “Polaron coherence condensation as the mechanism for colossal magnetoresistance in layered manganites,” Physical Review B, vol. 76, no. 23, Article ID 233102, 2007. View at Publisher · View at Google Scholar · View at Scopus
9. A. Lanzara, P. V. Bogdanov, X. J. Zhou, et al., “Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors,” Nature, vol. 412, no. 6846, pp. 510–514, 2001. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
10. C. J. Zhang, H. Oyanagi, Z. H. Sun, Y. Kamihara, and H. Hosono, “Low-temperature lattice structure anomaly in the ${\text{LaFeAsO}}_{0.93}{\text{F}}_{0.07}$ superconductor by X-ray absorption spectroscopy: evidence for a strong electron-phonon interaction,” Physical Review B, vol. 78, no. 21, Article ID 214513, 2008. View at Publisher · View at Google Scholar · View at Scopus
11. C. J. Zhang and H. Oyanagi, “Local lattice instability and superconductivity in ${\text{La}}_{1.85}{\text{Sr}}_{0.15}{\text{Cu}}_{1-x}{M}_x{\text{O}}_4$ ($M=\text{Mn}$, Ni, and Co),” Physical Review B, vol. 79, no. 6, Article ID 064521, 2009. View at Publisher · View at Google Scholar · View at Scopus
12. A. Bianconi, N. L. Saini, A. Lanzara, et al., “Determination of the local lattice distortions in the ${\text{CuO}}_2$ Plane of ${\text{La}}_{1.85}{\text{Sr}}_{0.15}{\text{Cuo}}_4$,” Physical Review Letters, vol. 76, no. 18, pp. 3412–3415, 1996.
13. N. L. Saini, A. Lanzara, H. Oyanagi, et al., “Local lattice instability and stripes in the ${\text{CuO}}_2$ plane of the ${\text{La}}_{1.85}{\text{Sr}}_{0.15}{\text{CuO}}_4$ system by polarized XANES and EXAFS,” Physical Review B, vol. 55, no. 18, pp. 12759–12769, 1997. View at Scopus
14. J. Mustre de Leon, S. D. Conradson, I. Batistić, and A. R. Bishop, “Evidence for an axial oxygen-centered lattice fluctuation associated with the superconducting transition in ${\text{YBa}}_2{\text{Cu}}_3{\text{O}}_7$,” Physical Review Letters, vol. 65, no. 13, pp. 1675–1678, 1990. View at Publisher · View at Google Scholar · View at Scopus
15. D. Mihailovic, “Optical experimental evidence for a universal length scale for the dynamic charge inhomogeneity of cuprate superconductors,” Physical Review Letters, vol. 94, no. 20, Article ID 207001, 4 pages, 2005. View at Publisher · View at Google Scholar · View at Scopus
16. A. Bussmann-Holder and H. Keller, “Polaron formation as origin of unconventional isotope effects in cuprate superconductors,” European Physical Journal B, vol. 44, no. 4, pp. 487–490, 2005. View at Publisher · View at Google Scholar · View at Scopus
17. H. Koizumi, “Loop current excitations in effectively half-filled mott insulators,” Journal of the Physical Society of Japan, vol. 77, no. 3, Article ID 034712, 2008. View at Publisher · View at Google Scholar · View at Scopus
18. H. Oyanagi, C. Fonne, D. Gutknecht, et al., “Ge pixel array detector for high throughput X-ray spectroscopy,” Nuclear Instruments and Methods in Physics Research A, vol. 513, no. 1-2, pp. 340–344, 2003. View at Publisher · View at Google Scholar · View at Scopus
19. H. Oyanagi, A. Tsukada, M. Naito, and N. L. Saini, “Local structure of superconducting ${(\text{La},\text{Sr})}_2{\text{CuO}}_4$ under strain: Microscopic mechanism of strain-induced $T_c$ variation,” Physical Review B, vol. 75, no. 2, Article ID 024511, 6 pages, 2007. View at Publisher · View at Google Scholar · View at Scopus
20. H. Sato, M. Naito, and H. Yamamoto, “Superconducting thin films of ${\text{La}}_2{\text{CuO}}_{4+\delta }$ by oxygen doping using ozone,” Physica C, vol. 280, no. 3, pp. 178–186, 1997. View at Scopus
21. J.-P. Locquet, J. Perret, J. Fompeyrine, E. Mächler, J. W. Seo, and G. Van Tendeloo, “Doubling the critical temperature of ${\text{La}}_{1.9}{\text{Sr}}_{0.1}{\text{CuO}}_4$ using epitaxial strain,” Nature, vol. 394, no. 6692, pp. 453–456, 1998. View at Publisher · View at Google Scholar · View at Scopus
22. I. Bozovic, G. Logvenov, I. Belca, B. Narimbetov, and I. Sveklo, “Epitaxial strain and superconductivity in ${\text{La}}_{2-x}{\text{Sr}}_x{\text{CuO}}_4$ thin films,” Physical Review Letters, vol. 89, no. 10, Article ID 107001, 2002. View at Scopus
23. J. M. Tarascon, L. H. Greene, P. Barboux, et al., “$3d$-metal doping of the high-temperature superconducting perovskites La-Sr-Cu-O and Y-Ba-Cu-O,” Physical Review B, vol. 36, no. 16, pp. 8393–8400, 1987. View at Publisher · View at Google Scholar · View at Scopus
24. H. Oyanagi, A. Tsukada, M. Naito, et al., “Fluorescence X-ray absorption spectroscopy using a Ge pixel array detector: application to high-temperature superconducting thin-film single crystals,” Journal of Synchrotron Radiation, vol. 13, no. 4, pp. 314–320, 2006. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
25. J. J. Rehr, R. C. Albers, and S. I. Zabinsky, “High-order multiple-scattering calculations of X-ray-absorption fine structure,” Physical Review Letters, vol. 69, no. 23, pp. 3397–3400, 1992. View at Publisher · View at Google Scholar · View at Scopus
26. C. de la Cruz, Q. Huang, J. W. Lynn, et al., “Magnetic order close to superconductivity in the iron-based layered ${\text{LaO}}_{1-x}{\text{F}}_x\text{FeAs}$ systems,” Nature, vol. 453, no. 7197, pp. 899–902, 2008. View at Publisher · View at Google Scholar · View at PubMed · View at Scopus
27. T. Nomura, S. W. Kim, Y. Kamihara, et al., “Crystallographic phase transition and high-$T_c$ superconductivity in LaFeAsO:F,” Superconductor Science and Technology, vol. 21, no. 12, Article ID 125028, 2008. View at Publisher · View at Google Scholar · View at Scopus
28. J. Lee, K. Fujita, A. R. Schmidt, et al., “Spectroscopic fingerprint of phase-incoherent superconductivity in the underdoped ${\text{Bi}}_2{\text{Sr}}_2{\text{CaCu}}_2{\text{O}}_{8+\delta }$,” Science, vol. 325, no. 5944, pp. 1099–1103, 2009. View at Publisher · View at Google Scholar · View at PubMed
29. P. G. Radaelli, D. G. Hinks, A. W. Mitchell, et al., “Structural and superconducting properties of ${\text{La}}_{2-x}{\text{Sr}}_x{\text{CuO}}_{\text{4}}$ as a function of Sr content,” Physical Review B, vol. 49, no. 6, pp. 4163–4175, 1994. View at Publisher · View at Google Scholar
30. C. J. Zhang, H. Oyanagi, and C. H. Lee, “Single crystal growth and characterization of ${\text{La}}_{2-x}{\text{Sr}}_x{\text{CuO}}_{\text{4}}$ with Mn doping,” Physica C, vol. 468, no. 11-12, pp. 898–902, 2008. View at Publisher · View at Google Scholar
31. R. Khasanov, D. G. Eshchenko, H. Luetkens, et al., “Direct observation of the oxygen isotope effect on the in-plane magnetic field penetration depth in optimally doped ${\text{YBa}}_2{\text{Cu}}_3{\text{O}}_{7-\delta }$,” Physical Review Letters, vol. 92, no. 5, Article ID 057602, 2004.
32. R. J. McQueeney, Y. Petrov, T. Egami, M. Yethiraj, G. Shirane, and Y. Endoh, “Anomalous dispersion of LO phonons in ${\text{La}}_{1.85}{\text{Sr}}_{0.15}{\text{CuO}}_4$ at low temperatures,” Physical Review Letters, vol. 82, no. 3, pp. 628–631, 1999.
33. L. Pintschovius and M. Braden, “Anomalous dispersion of LO phonons in ${\text{La}}_{1.85}{\text{Sr}}_{0.15}{\text{CuC}}_4$,” Physical Review B, vol. 60, no. 22, pp. R15039–R15042, 1999.
34. T. Fukuda, J. Mizuki, K. Ikeuchi, K. Yamada, A. Q. R. Baron, and S. Tsutsui, “Doping dependence of softening in the bond-stretching phonon mode of ${\text{La}}_{2-x}{\text{Sr}}_x{\text{CuO}}_{\text{4}}$ ($0\le x\le 0.29$),” Physical Review B, vol. 71, no. 6, Article ID 060501, 2005. View at Publisher · View at Google Scholar
35. D. Mihailovic, V. V. Kabanov, and K. A. Müller, “The attainable superconducting $T_c$ in a model of phase coherence by percolating,” Europhysics Letters, vol. 57, no. 2, pp. 254–259, 2002. View at Publisher · View at Google Scholar
36. J. C. Phillips, “Self-organized networks and lattice effects in high-temperature superconductors,” Physical Review B, vol. 75, no. 21, Article ID 214503, 2007. View at Publisher · View at Google Scholar
37. S. Miyaki, K. Makoshi, and H. Koizumi, “Two-copper-atom units induce a pseudo Jahn-Teller polaron in hole-doped cuprate superconductors,” Journal of the Physical Society of Japan, vol. 77, no. 3, Article ID 034702, 2008. View at Publisher · View at Google Scholar
38. H. Kamimura, H. Ushio, S. Matsuno, and T. Hamada, Theory of Copper Oxide Superconductors, Springer, Berlin, Germany, 2005.
39. C. J. Zhang and H. Oyanagi, in preparation .