mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-143Research ArticleСтатьиExponential temperature dependence of the Yb3+ relaxation in Y0.98Yb0.02Ba2Cu3OxMaisuradzeA.

CH-5232 Villigen PSI

ShengelayaA.

Chavchavadze av. 3, GE-0128 Tbilisi

alexander.shengelaya@tsu.gePomjakushinaE.

CH-5232 Villigen PSI

ConderK.

CH-5232 Villigen PSI

KellerH.

CH-5232 Villigen PSI

MüllerK. A.

CH-5232 Villigen PSI

Laboratory for Developments and Methods, Paul Scherrer InstitutSwitzerlandDepartment of Physics, Tbilisi State UniversityGeorgia201419042014162SPECIAL ISSUE dedicated to Boris I. Kochelaev's 80th birthday14205 (6 pp.)Copyright © Maisuradze A., Shengelaya A., Pomjakushina E., Conder K., Keller H., Müller K.A., 20242024Maisuradze A., Shengelaya A., Pomjakushina E., Conder K., Keller H., Müller K.A.Maisuradze A., Shengelaya A., Pomjakushina E., Conder K., Keller H., Müller K.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/143

The relaxation of Yb3+ in YBa2Cu3Ox (x = 6.1 and 6.4) was studied using Electron Paramagnetic Resonance (EPR). In these samples the Yb3+ relaxation is dominated by a phonon mechanism. It was shown that the conventional Raman two-phonon process involving acoustic phonons can not describe the temperature dependence of the Yb3+ relaxation. Instead, the Raman process involving optical phonons or an Orbach-like process via the excited vibronic levels of Cu2+ ions with energy Ω = 500(50) K is responsible for the phononic part of the Yb3+ relaxation in YBa2Cu3Ox. The present results provide clear experimental evidence that optical phonons or local vibrations are the dominant source of spin-lattice relaxation at sufficiently high temperatures, which cannot be described by the traditional approach using the Debye approximation.

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The authors declare that there are no conflicts of interest present.