Metal-insulator transition of R2-xCaxRu2O7 (R = Y, Sm)

S. Yoshii, K. Murata, M. Sato

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15 Citations (Scopus)


We have studied physical properties of pyrochlore ruthenates R2−xCaxRu2O7 (R = Y,Sm). Upon increasing Ca concentration x, or upon increasing holes introduced into the Mott insulating state, the system exhibits a transition to a metallic state (Mott transition). For the R atom with larger ionic radius, the critical concentration xc of the transition is smaller. The suppression of the spin-glass transition has also been found with increasing Ca concentration. In the proximity region of the metal to insulator phase boundary, the Hall coefficient is meaningfully enhanced with decreasing temperature and exhibits a pronounced peak at around TG, where the zero-field cooling susceptibility shows a maximum. Overall features of transport and magnetic properties of R2−xCaxRu2O7 are quite similar to those of other Mott M-I system R2−xBixRu2O7, in which the M-I transition is caused by a change of the transfer integral.

Original languageEnglish
Pages (from-to)129-134
Number of pages6
JournalJournal of Physics and Chemistry of Solids
Issue number1-2
Publication statusPublished - 2001 Jan

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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