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Nonlinear NMR and magnon BEC in antiferromagnetic materials with coupled electron and nuclear spin precession

Abdurakhimov, L; Borich, MA; Bunkov, YM; Gazizulin, RR; Konstantinov, D; Kurkin, MI; Tankeyev, AP; (2018) Nonlinear NMR and magnon BEC in antiferromagnetic materials with coupled electron and nuclear spin precession. Physical Review B , 97 (2) , Article 024425. 10.1103/PhysRevB.97.024425. Green open access

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Abstract

We present a study of nonlinear NMR and Bose-Einstein condensation (BEC) of nuclear spin waves in antiferromagnetic MnCO3 with coupled electron and nuclear spins. In particular, we show that the observed behavior of NMR signals strongly contradicts the conventional description of paramagnetic ensembles of noninteracting spins based on the phenomenological Bloch equations. We present a theoretical description of the coupled electron-nuclear spin precession, which takes into account an indirect relaxation of nuclear spins via the electron subsystem. We show that the magnitude of the nuclear magnetization is conserved for arbitrary large excitation powers, which is drastically different from the conventional heating scenario derived from the Bloch equations. This provides strong evidence that the coherent precession of macroscopic nuclear magnetization observed experimentally can be identified with the BEC of nuclear spin waves with k = 0.

Type: Article
Title: Nonlinear NMR and magnon BEC in antiferromagnetic materials with coupled electron and nuclear spin precession
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.97.024425
Publisher version: http://doi.org/10.1103/PhysRevB.97.024425
Language: English
Additional information: © 2018 American Physical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10042474
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