139La Pure Quadrupole Resonance of High Tc Superconducting Materials (La1-xMx)2CuO4 (M=Ba, Sr)
- 1 April 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (4A), L397
- https://doi.org/10.1143/jjap.26.l397
Abstract
Pure Quadrupole Resonance (PQR) of 139La in high T c superconductor, (La1-x M x )2CuO4 with M=Ba, Sr, has been observed at zero external field between 1.3 K and 4.2 K. In undoped La2CuO4, the PQR spectrum is very complicated, reflecting the orthorhombic structure, while in the superconducting compounds, the spectrum exhibits a drastic change and becomes more simple due to the tetragonal structure. The alloying is suggested to be responsible not only for the change of crystal structure but also for the change of microscopic electronic state.Keywords
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