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  Dichotomous dynamics of magnetic monopole fluids

Hsu, C.-C., Takahashi, H., Jerzembeck, F., Dasini, J., Carroll, C., Dusad, R., et al. (2024). Dichotomous dynamics of magnetic monopole fluids. PNAS, 121(21): 2320384121, pp. 1 of 7-7 of 7. doi:10.1073/pnas.2320384121.

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 Creators:
Hsu, Chun-Chih1, Author
Takahashi, Hiroto1, Author
Jerzembeck, Fabian2, Author           
Dasini, Jahnatta1, Author
Carroll, Chaia1, Author
Dusad, Ritika1, Author
Ward, Jonathan1, Author
Dawson, Catherine1, Author
Sharma, Sudarshan1, Author
Luke, Graeme M.1, Author
Blundell, Stephen J.1, Author
Castelnovo, Claudio1, Author
Hallén, Jonathan N.1, Author
Moessner, Roderich1, Author
Davis, J. C. Séamus3, Author           
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3J. C. Séamus Davis, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_3266851              

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Free keywords: dysprosium titanate, frustrated magnetism, magnetic dynamics, spin ice, dysprosium, ice, article, controlled study, diffusion, female, liquid, magnetic field, magnetism, male, noise, phenomenology, relaxation time, sensor, squid, temperature
 Abstract: A recent advance in the study of emergent magnetic monopoles was the discovery that monopole motion is restricted to dynamical fractal trajectories [J. N. Hallén et al., Science378, 1218 (2022)], thus explaining the characteristics of magnetic monopole noise spectra [R. Dusad et al., Nature571, 234 (2019); A. M. Samarakoon et al., Proc. Natl. Acad. Sci. U.S.A.119, e2117453119 (2022)]. Here, we apply this novel theory to explore the dynamics of field-driven monopole currents, finding them composed of two quite distinct transport processes: initially swift fractal rearrangements of local monopole configurations followed by conventional monopole diffusion. This theory also predicts a characteristic frequency dependence of the dissipative loss angle for AC field-driven currents. To explore these novel perspectives on monopole transport, we introduce simultaneous monopole current control and measurement techniques using SQUID-based monopole current sensors. For the canonical material Dy2Ti2O7, we measure [Formula: see text], the time dependence of magnetic flux threading the sample when a net monopole current [Formula: see text] is generated by applying an external magnetic field [Formula: see text] These experiments find a sharp dichotomy of monopole currents, separated by their distinct relaxation time constants before and after t ~[Formula: see text] from monopole current initiation. Application of sinusoidal magnetic fields [Formula: see text] generates oscillating monopole currents whose loss angle [Formula: see text] exhibits a characteristic transition at frequency [Formula: see text] over the same temperature range. Finally, the magnetic noise power is also dichotomic, diminishing sharply after t ~[Formula: see text]. This complex phenomenology represents an unprecedented form of dynamical heterogeneity generated by the interplay of fractionalization and local spin configurational symmetry.

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Language(s): eng - English
 Dates: 2024-05-14
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1073/pnas.2320384121
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Title: PNAS
  Other : Proceedings of the National Academy of Sciences of the United States of America
  Other : Proceedings of the National Academy of Sciences of the USA
  Abbreviation : Proc. Natl. Acad. Sci. U. S. A.
Source Genre: Journal
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Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: e2320384121 Volume / Issue: 121 (21) Sequence Number: 2320384121 Start / End Page: 1 of 7 - 7 of 7 Identifier: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230