Direct observation of the spin gap in NaV2O5 by submillimeter wave ESR

被引：28

作者：

Luther, S

Nojiri, H

Motokawa, M

Isobe, M

Ueda, Y

机构：

[1] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan

[2] Univ Tokyo, Inst Solid State Phys, Tokyo 1068666, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1998年 / 67卷 / 11期

关键词：

spin gap; spin-Peierls system; NaV2O5; ESR; high magnetic fields;

D O I：

10.1143/JPSJ.67.3715

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Transitions between the singlet ground state and the first excited triplet state in NaV2O5 have been observed by means of submillimeter wave ESR for the first time. The distinct Zeeman splitting clearly indicates that the first excited state is a triplet state. The singlet-triplet energy gap at zero field has been determined as Delta = 8.13 meV at T = 4.2 K. A considerable anisotropy of the absorption intensity with respect to the magnetic field orientation has been observed. The intensity is strongest for B//a and weakest for B//c. We propose that this result can he explained by including in the Hamiltonian the Dzyaloshinsky-Moriya interaction which breaks the selection rule.

引用

页码：3715 / 3717

页数：3

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