Magnetic excitations in the S=1/2 alternating chain compound (VO)(2)P2O7

被引：218

作者：

Garrett, AW

Nagler, SE

Tennant, DA

Sales, DA

Barnes, T

机构：

[1] OAK RIDGE NATL LAB,OAK RIDGE,TN 37831

[2] UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.79.745

中图分类号：

O4 [物理学];

学科分类号：

0702 [物理学];

摘要：

Magnetic excitations in an array of (VO)(2)P2O7 single crystals have been measured using inelastic neutron scattering. Until now, (VO)(2)P2O7 has been thought of as a two-leg antiferromagnetic Heisenberg spin ladder with chains running in the a direction. The present results show unequivocally that (VO)(2)P2O7 is best described as an alternating spin chain directed along the crystallographic b direction. In addition to the expected magnon with magnetic zone-center energy gap Delta = 3.1 meV, a second excitation is observed at an energy just below 2 Delta. The higher mode may be a triplet two-magnon bound state.

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页码：745 / 748

页数：4

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