Low-temperature measurements of magnetic susceptibility and specific heat of Eu2Ti2O7—An XY pyrochlore

Static magnetic susceptibility, crystal field and exchange interactions in rare earth titanate pyrochlores

“…In the present work, the results of these calculations have been corrected to fit the available spectral data and the measured temperature dependence of the dc-susceptibilities. 4 (g = 0, g ⊥ = 0) and 56 (g = 0, g ⊥ = 0). Each system containing rare earth ions with the ground electronic configuration 4f N (N = 5:13) is considered separately below.…”

“…as reported in [4], contains the temperature independent Van Vleck contribution only. At higher temperatures, the susceptibility decreases due to increasing populations of crystal field sublevels of the first excited 7 F 1 multiplet.…”

“…Calculated inverse bulk susceptibility of Eu 2 Ti 2 O 7 (N = 1, λ = λ ⊥ = 0, solid curve). Symbols-experimental data digitized from [4]. Inset: calculated site susceptibilities.…”

“…The temperature dependence of the isotropic susceptibilities of polycrystalline and single crystals of rare earth titanates have been presented in a number of recent publications (R = Sm [3], Eu [4], Gd [5][6][7][8][9][10], Tb [8][9][10][11][12][13][14][15][16], Dy [8,9,[17][18][19][20], Ho [8,9,11,[20][21][22][23], Er [8,11,18,24], Yb [8,11,17,18,25,26]). As a rule, the experimental data were analyzed using the Curie-Weiss law leading to estimations of the effective isotropic exchange coupling constant.…”

Ruthenium-europium configuration in the Eu2Ru2O7 pyrochlore

“…In the Eu 2 Ti 2 O 7 pyrochlore it has been shown that the europium ions experience a nearest-neighbour exchange interaction with a weak dipolar interaction below 4 K. [11][12] spectral region. At low temperatures, the emission peaks are dominated by trap emission due to direct energy transfer from intrinsic Eu 3+ ions to the extrinsic europium ions.…”