Small and large polarons in nickelates, manganites, and cuprates |
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| Authors: | P Calvani P Dore S Lupi A Paolone P Maselli P Giura B Ruzicka S -W Cheong W Sadowski |
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| Affiliation: | (1) INFM, Dipartimento di Fisica, Università di Roma “La Sapienza”, Piazzale A. Moro 2, I-00185 Roma, Italy;(2) Daresbury Laboratories, Warrington WAK 4AD, UK;(3) Bell Laboratories, Lucent Technologies, 07974 Murray Hill, New Jersey, USA;(4) Faculty of Applied Physics and Mathematics, Technical University of Gdansk, G. Narutowicza 11/12, 80-592 Gdansk, Poland |
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| Abstract: | By comparing the optical conductivities of La1.67Sr0.33NiO4 (LSNO), Sr1.5La0.5MnO4 (SLMO), Nd2CuO4-y (NCO), and Nd1.96Ce0.04CuO4 (NCCO), we have identified a peculiar behavior of polarons in this cuprate family. Whereas in LSNO and SLMO small polarons
localize into ordered structures below a transition temperature, in these cuprates the polarons appear to be large, and at
lowT their binding energy decreases. This reflects an increase of the polaron radius, which may trigger coherent transport. |
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| Keywords: | Polarons nickelates manganites cuprates |
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