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Heat capacity and magnetic properties of pyrochlore Hg2Os2O7

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Title: Heat capacity and magnetic properties of pyrochlore Hg2Os2O7
Authors: Tachibana, Makoto1, Kawaji, Hitoshi1, Atake, Tooru ataketooru@msl.titech.ac.jp
Source: Solid State Communications. Sep2004, Vol. 131 Issue 12, p745-748. 4p.
Subjects: Liquid helium, Thermomagnetism, Quantum liquids, Magnetic anomalies
Abstract: Hg2Os2O7, which has the cubic pyrochlore structure, remains metallic down to the liquid helium temperature unlike its isostructural counterpart Cd2Os2O7, which shows metal–insulator transition at 226K. Magnetization and heat capacity data for Hg2Os2O7 are presented. The magnetic anomaly at TN=88K shares many characteristics in common with the metal–insulator transition in Cd2Os2O7, though Hg2Os2O7 remains metallic below TN. The heat capacity Cp shows no or very little change in the magnetic entropy around TN, supporting the view that there is no long-range ordering of localized spins. The measured value of electronic heat-capacity coefficient γ=21mJK-2mol-1 is comparable to the value obtained from band-structure calculation on Cd2Os2O7, suggesting that mass-enhancement is small in Hg2Os2O7. There is a pronounced peak in Cp/T3 at 13.1K, which corresponds to a peak in the phonon density of states at 40cm-1. [Copyright &y& Elsevier]
Copyright of Solid State Communications is the property of Pergamon Press - An Imprint of Elsevier Science 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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DbLabel: Engineering Source
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Heat capacity and magnetic properties of pyrochlore Hg<subscript>2</subscript>Os<subscript>2</subscript>O<subscript>7</subscript>
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  Data: <searchLink fieldCode="AR" term="%22Tachibana%2C+Makoto%22">Tachibana, Makoto</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kawaji%2C+Hitoshi%22">Kawaji, Hitoshi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Atake%2C+Tooru%22">Atake, Tooru</searchLink><i> ataketooru@msl.titech.ac.jp</i>
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  Data: <searchLink fieldCode="JN" term="%22Solid+State+Communications%22">Solid State Communications</searchLink>. Sep2004, Vol. 131 Issue 12, p745-748. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Liquid+helium%22">Liquid helium</searchLink><br /><searchLink fieldCode="DE" term="%22Thermomagnetism%22">Thermomagnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+liquids%22">Quantum liquids</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+anomalies%22">Magnetic anomalies</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Hg2Os2O7, which has the cubic pyrochlore structure, remains metallic down to the liquid helium temperature unlike its isostructural counterpart Cd2Os2O7, which shows metal–insulator transition at 226K. Magnetization and heat capacity data for Hg2Os2O7 are presented. The magnetic anomaly at TN=88K shares many characteristics in common with the metal–insulator transition in Cd2Os2O7, though Hg2Os2O7 remains metallic below TN. The heat capacity Cp shows no or very little change in the magnetic entropy around TN, supporting the view that there is no long-range ordering of localized spins. The measured value of electronic heat-capacity coefficient γ=21mJK-2mol-1 is comparable to the value obtained from band-structure calculation on Cd2Os2O7, suggesting that mass-enhancement is small in Hg2Os2O7. There is a pronounced peak in Cp/T3 at 13.1K, which corresponds to a peak in the phonon density of states at 40cm-1. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Solid State Communications is the property of Pergamon Press - An Imprint of Elsevier Science 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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        Value: 10.1016/j.ssc.2004.07.007
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        Text: English
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      – SubjectFull: Liquid helium
        Type: general
      – SubjectFull: Thermomagnetism
        Type: general
      – SubjectFull: Quantum liquids
        Type: general
      – SubjectFull: Magnetic anomalies
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      – TitleFull: Heat capacity and magnetic properties of pyrochlore Hg2Os2O7
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              Text: Sep2004
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