Spiral spin liquid noise

An emerging concept for identification of different types of spin liquids [C. Broholm , , eaay0668 (2020)] is through the use of spontaneous spin noise [S. Chatterjee, J. F. Rodriguez-Nieva, E. Demler, , 104425 (2019)]. Here, we develop spin noise spectroscopy for spin liquid studies by considering...

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Published in:Proceedings of the National Academy of Sciences - PNAS Vol. 122; no. 12; p. e2422498122
Main Authors: Takahashi, Hiroto, Hsu, Chun-Chih, Jerzembeck, Fabian, Murphy, Jack, Ward, Jonathan, Enright, Jack D, Knapp, Jan, Puphal, Pascal, Isobe, Masahiko, Matsumoto, Yosuke, Takagi, Hidenori, Davis, J C Séamus, Blundell, Stephen J
Format: Journal Article
Language:English
Published: United States 25.03.2025
Subjects:
quantum spin liquid
spin noise spectroscopy
spiral spin liquid
ISSN:1091-6490, 1091-6490
Online Access:Get more information
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Summary:An emerging concept for identification of different types of spin liquids [C. Broholm , , eaay0668 (2020)] is through the use of spontaneous spin noise [S. Chatterjee, J. F. Rodriguez-Nieva, E. Demler, , 104425 (2019)]. Here, we develop spin noise spectroscopy for spin liquid studies by considering Ca Cr O , a material hypothesized to be either a quantum or a spiral spin liquid (SSL). By enhancing techniques introduced for magnetic monopole noise studies [R. Dusad , , 234-239 (2019)], we measure the time and temperature dependence of spontaneous flux [Formula: see text] and thus magnetization [Formula: see text] of Ca Cr O samples. The resulting power spectral density of magnetization noise [Formula: see text] reveals intense spin fluctuations with [Formula: see text] and [Formula: see text]. Both the variance [Formula: see text] and the correlation function [Formula: see text] of this spin noise undergo crossovers at a temperature [Formula: see text]. While predictions for quantum spin liquids are inconsistent with this phenomenology, those from Monte-Carlo simulations of a two-dimensional (2D) SSL state in Ca Cr O yield overall quantitative correspondence with the measured frequency and temperature dependences of [Formula: see text], and [Formula: see text], thus indicating that Ca Cr O is an SSL.
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ISSN:1091-6490
1091-6490
DOI:10.1073/pnas.2422498122