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MM: Fachverband Metall- und Materialphysik
MM 22: Interface Controlled Properties, Nanomaterials and Microstructure Design III
MM 22.5: Talk
Tuesday, March 19, 2024, 11:15–11:30, C 230
Electric field gradients at 111mCd sites in single domain and periodically poled Mg-doped LiNbO3 crystals — •Hannes Gürlich1, Björn Dörschel3, Thienh Thanh Dang3, Ian Yap3, Juliana Schell1,2, Samuel Dominic Seddon1, Boris Koppitz1, and Lukas Eng1 — 1Technische Universität Dresden — 2European Organization for Nuclear Research (CERN) — 3Instrute for Materials Science and Center tor Nanointegration Duisburg-Essen (CENIDE)
At ISOLDE-CERN, 111mCd was implanted at 30 keV into differently ferroelectric-polarized LiNbO3-5%Mg crystals in z-direction. After annealing at 600 ∘C, 700 ∘C or 800 ∘C for up to 30 min in an oxygen atmosphere, the samples were measured with the time-differential perturbed angular correlation (TDPAC) technique for at least 2 h at room temperature.
The results show that in the periodically polled samples, the measured electric field gradient (EFG) is strongly suppressed. While in the single domain samples, this depends strongly on the annealing temperature. At 800 ∘C annealing temperature, the signal is strongly suppressed, while at 700 ∘C the best results were found. Therefore, it is proposed, that in between those two temperatures an irreversible destruction of the unitary directed polarization occurs.
Two main frequencies were found being independent of the polarization direction: 214(5) MHz and 173(5) MHz.
Keywords: PAC; LiNbO3; Domain Walls; 111mCd; ISOLDE-CERN