Curie-like paramagnetism due to incomplete Zhang-Rice singlet formation in La2-xSrxCuO4
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| Authors: | Kaiser, CV; Huang, W; Komiya, S; Hussey, NE; Adachi, T; Tanabe, Y; Koike, Y; Sonier, JE |
| Year: | 2012 |
| Journal: | Physical Review B 86 Article Link (DOI) |
| Title: | Curie-like paramagnetism due to incomplete Zhang-Rice singlet formation in La2-xSrxCuO4 |
| Abstract: | In an effort to elucidate the origin of the Curie-like paramagnetism that is generic for heavily overdoped cuprates, we have performed high-transverse-field muon spin rotation (TF-mu SR) measurements of La2-xSrxCuO4 single crystals over the Sr content range 0.145 <= x <= 0.33. We show that the x dependence of the previously observed field-induced broadening of the internalmagnetic field distribution above the superconducting transition temperature T-c reflects the presence of two distinct contributions. One of these becomes less pronounced with increasing x and is attributed to diminishing antiferromagnetic correlations. The other grows with increasing x, but decreases above x similar to 0.30, and is associated with the Curie-like term in the bulk magnetic susceptibility.. In contrast to the Curie-like term, however, this second contribution to the TF-mu SR linewidth extends back into the underdoped regime. Our findings imply a coexistence of antiferromagnetically correlated and paramagnetic moments, with the latter becoming dominant beyond x similar to 0.185. This suggests that the doped holes do not neutralize all Cu spins via the formation of Zhang-Rice singlets. Moreover, the paramagnetic component of the TF-mu SR linewidth is explained by holes progressively entering the Cu 3d(x2-y2) orbital with doping. |
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