Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: Measurement Technology and Cryogenics
TT 8.4: Talk
Monday, March 17, 2025, 15:45–16:00, H32
Broadband EPR Spectroscopy of LiYF4 doped with Rare-Earth Ions — •Ana Strinic1,2,3, Patricia Oehrl1,2,3, Georg Mair1,2, Hans Huebl1,2,3, Rudolf Gross1,2,3, and Nadezhda Kukharchyk1,2,3 — 1Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities, Garching, Germany — 2School of Natural Sciences, Technical University of Munich, Garching, Germany — 3Munich Center for Quantum Science and Technology, Munich, Germany
We report on the study of hyperfine transitions of rare-earth ions doped into the host crystal LiYF4 (RE3+:7LiYF4) using broadband EPR spectroscopy at millikelvin temperatures. While the studied crystals are intentionally doped with 167Er or 143Nd, we identify impurity traces of other rare-earth ions from their EPR-transitions, based on previously published spin Hamiltonian parameters [1]. Taking into account the electron Zeeman, the hyperfine, and the quadrupole interactions, the high resolution spectra allow for the determination of refined spin Hamiltonian parameters for 167Er and 143Nd, as well as for the identified impurities. Our results demonstrate the advantage of using broadband EPR for material research, not only because precise information on the interactions of the spin system can be obtained, but also because the material purity can be tested. This study is relevant for quantum memory applications, as high purity materials are associated with achieving long coherence times [2].
[1] J. P. Sattler, J. Nemarich, Phys. Rev. B 4, 1, (1971);
[2] M. Le Dantec et al., Sci. Adv. 7, eabj9786 (2021).
Keywords: Rare-earth spin ensemble; EPR spectroscopy