Observation of Phase Transition from Metal to Spin-Singlet Insulator in MgTi_2O_4 with S = 1/2 Pyrochlore Lattice
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概要
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We have synthesized well-defined powder samples of MgTi_2O_4, that are expected to realize the pyrochlore lattice with S = 1/2, and measured the magnetic susceptibility, lattice parameters and resistivity as a function of temperature. We found a phase transition from the metal to the spin-singlet insulator at around 260 K, which was accompanied by a structural transformation from cubic to tetragonal. The transition is a kind of Peierls transition in the three-dimensional lattice, which suggests a close relationship to the internal low dimensionality embedded in the spinel structure. The ground state may be spin-singlet dimers theoretically predicted to be the ground state of the S = 1/2 Heisenberg antiferromagnet on the pyrochlore lattice.
- 社団法人日本物理学会の論文
- 2002-08-15
著者
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ISOBE Masahiko
Material Design and Characterization Laboratory,Institute for Solid State Physics,The University of
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UEDA Yutaka
Material Design and Characterization Laboratory,Institute for Solid State Physics,The University of
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Isobe Masahiko
Materials Design And Characterization Laboratory Institute For Solid State Physics University Of Tok
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