Comparative μ+SR study of the zigzag chain compounds NaMn2O4 & LiMn2O4

被引：9

作者：

Ikedo, Y. ^{[1
]}

Sugiyama, J. ^{[2
]}

Ofer, O. ^{[3
]}

Mansson, M. ^{[4
]}

Sakurai, H. ^{[5
]}

Takayama-Muromachi, E. ^{[5
]}

Ansaldo, E. J. ^{[3
]}

Brewer, J. H. ^{[3
,6
]}

Chow, K. H. ^{[7
]}

机构：

[1] KEK, Muon Sci Lab, Ibaraki, Japan

[2] Toyota Cent Res & Dev Labs Inc, Aichi, Japan

[3] TRIUMF, Vancouver, BC, Canada

[4] ETH Zurich & Paul Scherrer Inst, LNS, Villigen, Switzerland

[5] Natl Inst Mat Sci, Ibaraki, Japan

[6] Univ British Columbia, CIFAR, Dept Phys & Astron, Vancouver, BC, Canada

[7] Univ Alberta, Dept Phys, Edmonton, AB T6G 2M7, Canada

来源：

ADVANCED SCIENCE RESEARCH SYMPOSIUM 2009: POSITRON, MUON AND OTHER EXOTIC PARTICLE BEAMS FOR MATERIALS AND ATOMIC/MOLECULAR SCIENCES | 2010年 / 225卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

SPIN DYNAMICS; HIGH-PRESSURE; GLASSES;

D O I：

10.1088/1742-6596/225/1/012017

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The magnetic nature of the CaFe2O4-type NaMn2O4 and Li0.92Mn2O4, in which Mn ions form a zigzag chain along the b-axis, have been investigated by muon-spin rotation and relaxation (mu+SR) and susceptibility (chi) measurements in the temperature range between 1.9 and 250 K using polycrystalline samples. Weak transverse-field mu+SR measurements revealed the existence of a bulk antiferromagnetic (AF) transition for NMO at T-N = 39 K and for Li0.92Mn2O4 at T-N = 44 K, although the chi(T) curve did not exhibit a clear anomaly around TN for either compound. Below T-N, however, the zero-field mu+SR spectra in both samples did not show the oscillatory signal characteristic of long-range magnetic order. Instead, a slowly relaxing tail is observed. Comparisons with the calculated internal magnetic field for the AF ordered phase suggests that the AF spin structure is disordered and/or rapidly fluctuating. In the paramagnetic region above 100 K, a nuclear magnetic field in Li0.92Mn2O4 was found to be dynamic, whereas that in NaMn2O4 was almost static. This implies the diffusive motion of Li+ ions in Li0.92Mn2O4 even below 250 K.

引用

页数：8

共 17 条

[1] High-pressure synthesis and crystal structure analysis of NaMn2O4 with the calcium ferrite-type structure [J].