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Supercooled spin liquid state in the frustrated pyrochlore Dy2Ti2O7.

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Title: Supercooled spin liquid state in the frustrated pyrochlore Dy2Ti2O7.
Authors: Kassner, Ethan R.1, Eyvazov, Azar B.1, Pichler, Benjamin1,2, Munsie, Timothy J. S.3,4, Dabkowska, Hanna A.3, Luke, Graeme M.3,4,5, Séamus Davis, J. C.1,6,7,8 jcseamusdavis@gmail.com
Source: Proceedings of the National Academy of Sciences of the United States of America. 7/14/2015, Vol. 112 Issue 28, p8549-8554. 6p.
Subjects: Supercooled liquids, Pyrochlore, Electron spin states, Crystallization, Magnetic relaxation, Magnetization, Magnetic fluids
Abstract: A “supercooled” liquid develops when a fluid does not crystallize upon cooling below its ordering temperature. Instead, the microscopic relaxation times diverge so rapidly that, upon further cooling, equilibration eventually becomes impossible and glass formation occurs. Classic supercooled liquids exhibit specific identifiers including microscopic relaxation times diverging on a Vogel–Tammann– Fulcher (VTF) trajectory, a Havriliak–Negami (HN) form for the dielectric function e(ω, T), and a general Kohlrausch–Williams–Watts (KWW) form for time-domain relaxation. Recently, the pyrochlore Dy2Ti2O7 has become of interest because its frustrated magnetic interactions may, in theory, lead to highly exotic magnetic fluids. However, its true magnetic state at low temperatures has proven very difficult to identify unambiguously. Here, we introduce highprecision, boundary-free magnetization transport techniques based upon toroidal geometries and gain an improved understanding of the time- and frequency-dependent magnetization dynamics of Dy2Ti2O7. We demonstrate a virtually universal HN form for the magnetic susceptibility χ (ω, T), a general KWW form for the realtime magnetic relaxation, and a divergence of the microscopic magnetic relaxation rates with the VTF trajectory. Low-temperature Dy2Ti2O7 therefore exhibits the characteristics of a supercooled magnetic liquid. One implication is that this translationally invariant lattice of strongly correlated spins may be evolving toward an unprecedented magnetic glass state, perhaps due to many-body localization of spin. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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PubType: Academic Journal
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  Data: Supercooled spin liquid state in the frustrated pyrochlore Dy<subscript>2</subscript>Ti<subscript>2</subscript>O<subscript>7</subscript>.
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  Data: <searchLink fieldCode="AR" term="%22Kassner%2C+Ethan+R%2E%22">Kassner, Ethan R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Eyvazov%2C+Azar+B%2E%22">Eyvazov, Azar B.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pichler%2C+Benjamin%22">Pichler, Benjamin</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Munsie%2C+Timothy+J%2E+S%2E%22">Munsie, Timothy J. S.</searchLink><relatesTo>3,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Dabkowska%2C+Hanna+A%2E%22">Dabkowska, Hanna A.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Luke%2C+Graeme+M%2E%22">Luke, Graeme M.</searchLink><relatesTo>3,4,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Séamus+Davis%2C+J%2E+C%2E%22">Séamus Davis, J. C.</searchLink><relatesTo>1,6,7,8</relatesTo><i> jcseamusdavis@gmail.com</i>
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  Data: <searchLink fieldCode="DE" term="%22Supercooled+liquids%22">Supercooled liquids</searchLink><br /><searchLink fieldCode="DE" term="%22Pyrochlore%22">Pyrochlore</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+spin+states%22">Electron spin states</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallization%22">Crystallization</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+relaxation%22">Magnetic relaxation</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetization%22">Magnetization</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fluids%22">Magnetic fluids</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: A “supercooled” liquid develops when a fluid does not crystallize upon cooling below its ordering temperature. Instead, the microscopic relaxation times diverge so rapidly that, upon further cooling, equilibration eventually becomes impossible and glass formation occurs. Classic supercooled liquids exhibit specific identifiers including microscopic relaxation times diverging on a Vogel–Tammann– Fulcher (VTF) trajectory, a Havriliak–Negami (HN) form for the dielectric function e(ω, T), and a general Kohlrausch–Williams–Watts (KWW) form for time-domain relaxation. Recently, the pyrochlore Dy2Ti2O7 has become of interest because its frustrated magnetic interactions may, in theory, lead to highly exotic magnetic fluids. However, its true magnetic state at low temperatures has proven very difficult to identify unambiguously. Here, we introduce highprecision, boundary-free magnetization transport techniques based upon toroidal geometries and gain an improved understanding of the time- and frequency-dependent magnetization dynamics of Dy2Ti2O7. We demonstrate a virtually universal HN form for the magnetic susceptibility χ (ω, T), a general KWW form for the realtime magnetic relaxation, and a divergence of the microscopic magnetic relaxation rates with the VTF trajectory. Low-temperature Dy2Ti2O7 therefore exhibits the characteristics of a supercooled magnetic liquid. One implication is that this translationally invariant lattice of strongly correlated spins may be evolving toward an unprecedented magnetic glass state, perhaps due to many-body localization of spin. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1073/pnas.1511006112
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      – Code: eng
        Text: English
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        PageCount: 6
        StartPage: 8549
    Subjects:
      – SubjectFull: Supercooled liquids
        Type: general
      – SubjectFull: Pyrochlore
        Type: general
      – SubjectFull: Electron spin states
        Type: general
      – SubjectFull: Crystallization
        Type: general
      – SubjectFull: Magnetic relaxation
        Type: general
      – SubjectFull: Magnetization
        Type: general
      – SubjectFull: Magnetic fluids
        Type: general
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      – TitleFull: Supercooled spin liquid state in the frustrated pyrochlore Dy2Ti2O7.
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              Text: 7/14/2015
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              Y: 2015
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