Bibliographic Details
| 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] |
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| Database: |
Engineering Source |
