@article{10902/28137,
year = {2022},
month = {8},
url = {https://hdl.handle.net/10902/28137},
abstract = {11 nm diameter quasi-spherical and single phase CuO/Cu2O nanocomposites, with varying CuO:Cu2O ratio, were synthesized using solvothermal process. X-ray diffraction patterns refined with the Rietveld method show an evolution of the CuO:Cu2O ratio ( %) for the three samples (100:0, 66:34, and 9:91), along with an increased lattice deformation of the CuO unit cell as the amount of Cu2O increased: a = 4.653(2) Å, b = 3.411(1) Å, and c = 5.131(1) Å for the single phase CuO nanoparticles, similar to bulk, while a = 4.727(2) Å, b = 3.457(3) Å, and c = 5.247(2) Å for the 9/91 % CuO/Cu2O nanocomposites. Magnetic measurements as a function of the temperature (M vs T) and as a function of the magnetic field (M vs H) nanoparticles indicated the presence of a ferromagnetic phase in the whole range of temperatures for the single phase CuO nanoparticles, as revealed by the persistent hysteresis observed in the M vs H loops. In addition, an enhanced antiferromagnetic contribution, denoted by the increase in the antiferromagnetic susceptibility, χAF∼ 4.8 10−6 emu∙g−1∙Oe−1, is also observed for these single phase CuO nanoparticles, while for bulk CuO, χAF ∼ 0.6 10−6 emu∙g−1∙Oe−1. With increasing Cu2O content (≥ 34 % Cu2O), the ferromagnetic phase is drastically suppressed for all temperatures, whereas the antiferromagnetic contribution at low temperatures (2–5 K) first increases (χAF ∼ 5.1 10−6 emu∙g−1∙Oe−1 for 34 % Cu2O), but then, it gets reduced (χAF ∼ 1.46 10−6 emu∙g−1∙Oe−1 for 91 % Cu2O). These magnetic changes showcase the relevance of the interface effects introduced by the Cu2O phase in CuO/Cu2O nanocomposites.},
organization = {The work was supported by the Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant number 103.02-2019.314. J.A. and L.F.B acknowledge financial support provided through the Spanish "Ministerio de Ciencia, Investigación y Universidades" projects: MAT2017-83631-C3-R and PID2020-115704RB-C3. E.M.J. acknowledges “Beca Concepción Arenal” BDNS: 406333 granted by the Gobierno de Cantabria and the Universidad de Cantabria. R.D. acknowledges Manh-Huong Phan and Hariharan Srikanth. For synthesis and characterization facilities in Functional Materials Laboratory, Department of Physics, University of South Florida, Tampa, Florida, 33620, United States.},
publisher = {Elsevier},
publisher = {Materials today communications, 2022, 32, 104038},
title = {Suppression of ferromagnetic order in CuO/Cu2O nanocomposites},
author = {Das, R. and Alonso Masa, Javier and Jefremovas Leva, Ana Isabel and Fernández Barquín, Luis and Ngoc, P.K. and Nguyen, H.T. and Viet, D.T. and Vinh, P.V. and Duong, A.T.},
}