Probing spin fluctuations in NaOsO3by muon spin rotation and NMR spectroscopy

Namrata Gurung; Chennan Wang; Nicholas S Bingham; Joel A T Verezhak; Kazunari Yamaura; Giuseppe Allodi; Paola Caterina Forino; Samuele Sanna; Hubertus Luetkens; V Scagnoli

doi:10.1088/1361-648X/ac06eb

Probing spin fluctuations in NaOsO₃by muon spin rotation and NMR spectroscopy

J Phys Condens Matter. 2021 Jun 25;33(33). doi: 10.1088/1361-648X/ac06eb.

Authors

Affiliations

¹ Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.
² Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.
³ Laboratory for Muon Spin Spectroscopy (LMU), Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland.
⁴ Department of Applied Physics, Yale University, New Haven, Connecticut 06511, United States of America.
⁵ International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
⁶ Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy.
⁷ Department of Physics and Astronomy 'A. Righi', University of Bologna, via Berti-Pichat 6-2, 40127 Bologna, Italy.

PMID: 34062527
DOI: 10.1088/1361-648X/ac06eb

Abstract

We have used muon spin rotation and relaxation (μSR) and²³Na nuclear magnetic resonance (NMR) spectroscopic methods in the NaOsO₃antiferromagnetic phase to determine the temperature evolution of the magnetic order parameter and the role of the magnetic fluctuations at the Néel temperature. Additionally, we performed muon spin relaxation measurements in the vicinity ofT_A= 30 K, where the appearance of an anomaly in the electrical resistivity was suggested to be due to a progressive reduction of the Os magnetic moment associated with spin fluctuation. Our measurements suggest the absence of prominent change in the spin fluctuations frequency atT_A, within the muon probing time scale and the absence of a reduction of the localized Os magnetic moment reflected by the stability within few permille of the local magnetic field strength sensed by the muons below 50 K.

Keywords: magnetism; metal-insulator transition; muon spin spectroscopy; nuclear magnetic resonance; phase transition.