Probing the Yb3+ spin relaxation in Y0.98Yb0.02Ba2Cu3Ox by electron paramagnetic resonance

Maisuradze, A; Shengelaya, A; Kochelaev, B I; Pomjakushina, E; Conder, K; Keller, H; Müller, K A

doi:10.5167/uzh-18446

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Maisuradze, A., Shengelaya, A., Kochelaev, B. I., Pomjakushina, E., Conder, K., Keller, H., & Müller, K. A. (2009). Probing the Yb3+ spin relaxation in Y0.98Yb0.02Ba2Cu3Ox by electron paramagnetic resonance. Physical Review. B, Condensed Matter and Materials Physics, 79(5), 054519. https://doi.org/10.1103/PhysRevB.79.054519

Abstract

The relaxation of Yb3+ in YBa2Cu3Ox (6<x<7) was studied using electron paramagnetic resonance. It was found that both electronic and phononic processes contribute to the Yb3+ relaxation. The phononic part of the relaxation has an exponential temperature dependence, which can be explained by a Raman process via the coupling to high-energy (~500 K) optical phonons or an Orbach-type process via the excited vibronic levels of the Cu2+ ions (localized Slonczewski-modes). In a sample with a maximum oxygen doping x=6.98, the electronic part