In order to investigate the electronic state of Ce-free and Ce-underdoped high-Tc cuprates with the so-called T' structure, we have performed muon-spin-relaxation (muSR) and specific-heat measurements of Ce-free T'-La_1.8_Eu_0.2_CuO_4+d_ (T'-LECO) polycrystals and Ce-underdoped T'-Pr_1.3-x_La_0.7_Ce_x_CuO_4+d_ (T'-PLCCO) single crystals with x=0.10. The muSR spectra of the reduced superconducting samples of both T'-LECO with Tc=15K and T'-PLCCO with x=0.10 and Tc=27K have revealed that a short-range magnetic order coexists with the superconductivity in the ground state. The formation of a short-range magnetic order due to a tiny amount of excess oxygen in the reduced superconducting samples strongly suggest that the Ce-free and Ce-underdoped T'-cuprates are regarded as strongly correlated electron systems.
@article{arxiv.1512.08095,
title = {Strong electron correlation behind the superconductivity in Ce-free and Ce-underdoped high-Tc T'-cuprates},
author = {T. Adachi and A. Takahashi and K. M. Suzuki and M. A. Baqiya and T. Konno and T. Takamatsu and M. Kato and I. Watanabe and A. Koda and M. Miyazaki and R. Kadono and Y. Koike},
journal= {arXiv preprint arXiv:1512.08095},
year = {2017}
}
Comments
6 pages, 3 figures. For the supplementary materials, please contact the corresponding author