Observation of phase transition from metal to spin-singlet insulator in MgTi2O4 with S=1/2 pyrochlore lattice

被引：92

作者：

Isobe, M ^{[1
]}

Ueda, Y ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Mat Design & Characterizat Lab, Kashiwa, Chiba 2778581, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2002年 / 71卷 / 08期

关键词：

MgTi2O4; pyrochlore lattice with S=1/2; metal-insulator transition; structural transition; spin-singlet ground state;

D O I：

10.1143/JPSJ.71.1848

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have synthesized well-defined powder samples of MgTi2O4, 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 260K, 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.

引用

页码：1848 / 1851

页数：4

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