Putu Eka Dharma Putra, Malik Anjelh Baqiya, Resky Irfanita, Andon Insani, Darminto
The magnetic feature of the superconductor material is a challenging issue in the work of searching the new High-Tc Superconductor (HTSc). The role of magnetic feature including its magnetic structure may be the key to understand the true mechanism of the superconducting materials with a higher critical temperature Tc. The purpose of this research is to observe the weak magnetic feature in the reduced T’-Pr2-xCexCuO4 (T’-PCCO) with x = 0, and 0.15 powders using neutron powder diffraction (ND) technique. The reduced powders were obtained by the chemically dissolved method and then continued by a short reduction annealing process at 700oC for 5 h. The profile refinements of both ND patterns show an indexed peak of PCCO phase with I4/mmm space group. The careful Rietveld analysis shows a coupled magnetic contribution at some of the nuclear Bragg position indicating a weak magnetic feature with propagation vector k (0.5 0.5 0) on both reduced samples. Interestingly, the magnetic unit cells are found to be not a simple periodic order of the chemical unit cell and the corresponding spins could be arranged even more than just antiferromagnetic ordering. The Ce-dependence of the volumetric unit cell is confirmed and consistent with the bond valance sum calculation. The scattering density via Fourier transform calculation shows the remnant magnetic interaction is relatively small compared to its combined nuclear and magnetic phases. This signifies the existence of a weak magnetic feature in the T’-structure. Moreover, the magnetic refinement confirms the decrease of collective magnetic moments of T’-PCCO with x = 0 and 0.15 in the reduced system showing an antiferromagnetic spin arrangement due to recovery of apical oxygen. © 2022 American Institute of Physics Inc.. All rights reserved.
Department of Physics, Sepuluh Nopember Institute of Technology (ITS), ITS Campus, Keputih, Sukolilo, Surabaya, 60111, Indonesia; Institute of Materials and Optoelectronic Science, National Sun Yat-sen University (NSYSU), Kaohsiung, 80424, Taiwan; Department of Physics, Faculty of Mathematics and Natural Science, State University of Makassar, Jalan Daeng Tata Raya, Makassar, 90223, Indonesia; Centre for Science and Technology of Advanced Materials, National Atomic Energy Agency, PUSPIPTEK, Jl. Raya Serpong, Tangerang Selatan, Banten, 15314, Indonesia
