Magnetic Properties of La3Ga5.5Ta0.5O14 Single Crystals Doped with Sm3+ and Er3+ Ions

S.M. Kaczmareka, G. Lenieca, M. Berkowskib, S. Kazanc and M. Acikgozd,e aInstitute of Physics, Faculty of Mechanical Engineering and Mechatronics, Westpomeranian University of Technology, 17 Al. Piastow Str., 70-310 Szczecin bInstitute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46 PL-02668 Warsaw, Poland cGebze Technical University, Department of Physics, TR-41400 Gebze, Turkey dBahcesehir University, Faculty of Engineering and Natural Sciences, Beşiktaş, Istanbul, Turkey eDepartment of Chemistry, Rutgers University, Newark, New Jersey 07102, USA

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Electron paramagnetic resonance and magnetic susceptibility measurements were performed for two La3Ga5.5Ta0.5O14 single crystals doped with 1.96 at.% of Sm3+ ions and 3.8 at.% of Er3+ ions. Two magnetically inequivalent sites were found to be responsible for the electron paramagnetic resonance spectra of Sm3+ ions. Both sites reveal a low (at least C2) symmetry with gx ∼ 0.46, gy ∼ 0.46 and gz ∼ 0.52. The symmetry of isolated erbium ions is higher than C2. From electron paramagnetic resonance and magnetic susceptibility experiments it results that the ground state of Er3+ ions is Γ6 or Γ7. Below 51 K electronic transitions within Γ6 doublets take place. Between 51 and 60 K, Γ6 to Γ7 transitions dominate, while above 60 K mainly transitions within Γ 7 doublet are active.

DOI: 10.12693/APhysPolA.131.386 PACS numbers: 75.10.Dg, 76.30.Kg, 75.30.Gw, 75.40.Cx