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- W2078135399 abstract "Abstract Enhanced NMR of 169Tm ( I= 1 2 ) enhanced NMR has been studied in TmBa2Cu3O6+x, x=0, 0.2, 0.4, at temperatures 1.2–40K. The nuclear magnetic relaxation rates at T>20K increase exponentially as 1 T 1(2) = R 1(2) exp (−Δ/ kT ) , with Δ = 176 K being the energy of the first excited state of the Tm3+ ion, while the R1(2) pre-exponential factors are inversely proportional to the homogenous width Γo of this doublet state. The pre-exponential factors measured at the frequencies of 48 and 69 MHz show homogeneous broadening of the 4f-levels due to the decreasing dipole-dipole transfer of the electron excitations from ion to ion at increasing because of crystal structure disordering. A sharp decrease of Γo (by about 0.9K) is observed in the superconducting compound with x=0.4 (Tc onset at 20K) at low temperatures and is attributed to the weakening of the 4f-electron-phonon interaction. At the temperatures around 6K the same sample displays enhancement of the transverse relaxation due to the relatively slow (W ≈ 109s−1) fluctuations of the internal magnetic fields caused by Cu2+ ions in CuO2 planes." @default.
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- W2078135399 date "1992-07-01" @default.
- W2078135399 modified "2023-09-23" @default.
- W2078135399 title "Decrease of the homogeneous width of the Tm3+ electron energy levels in TmBa2CCu3 O6+x at the superconducting transition" @default.
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- W2078135399 doi "https://doi.org/10.1016/0038-1098(92)90886-e" @default.
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