| Autor: |
Takanori Taniguchi, Shunsaku Kitagawa, Kenji Ishida, Shun Asano, Kota Kudo, Motofumi Takahama, Peiao Xie, Takashi Noji, Masaki Fujita |
| Zdroj: |
Journal of the Physical Society of Japan; 7/15/2022, Vol. 91 Issue 7, p1-6, 6p |
| Abstrakt: |
In T+-type cuprate oxides with five-oxygen coordination, the relationship between spin correlations and doped carriers has not been well understood. To clarify this relationship, and the magnetic and superconducting (SC) properties of T+- type cuprate oxides, we performed 139La-nuclear magnetic resonance (NMR) and electrical resistivity measurements on as-sintered (AS) and oxidation-annealed (OA) polycrystalline T+-type La0.86Eu0.86S0.28CuO4 (LESCO) to investigate its magnetic and SC properties. Upon cooling, the NMR spectrum of AS LESCO broadened below 3K, where the nuclear spin-lattice relaxation rate 1=T1 with respect to the temperature exhibited a maximum, indicating the appearance of static magnetism. The temperature dependence of 1=T1 between 3 and 20K was similar to that of resistivity, which displays semiconducting behavior. Furthermore, it was found that the energy scales of the transport gap and spin dynamics were comparable. These results suggest a close connection between the mobility of the doped carriers and low-energy spin dynamics, as reported for lightly doped T-type La2-xSrxCuO4. In the OA SC sample, we confirmed the absence of a magnetic order and the linear relation between 1=T1 and T above 10 K. These results suggest that the magnetic state coupled with holes markedly changes to the weakly correlated metallic state by oxidation annealing in the T+-type LESCO with x = 0.28. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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