Evolution of charge order through the magnetic phase transition of LuFe2O4

被引：7

作者：

Bartkowiak, M. ^{[1
,2
]}

Mulders, A. M. ^{[1
]}

Scagnoli, V. ^{[3
]}

Staub, U. ^{[3
]}

Pomjakushina, E. ^{[4
]}

Conder, K. ^{[4
]}

机构：

[1] UNSW, Sch Phys Environm & Math Sci, Canberra, ACT 2600, Australia

[2] Australian Nucl Sci & Technol Org, Bragg Inst, Lucas Heights, NSW 2234, Australia

[3] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[4] Paul Scherrer Inst, Lab Dev & Methods, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 03期

基金：

瑞士国家科学基金会;

关键词：

SYSTEM LUFE2O4; SPIN; MOSSBAUER; YFE2O4; YBFE2O4;

D O I：

10.1103/PhysRevB.86.035121

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The charge order in multiferroic LuFe2O4 has been investigated with resonant x-ray diffraction at the Fe K edge in the combined charge ordered and magnetic phase. The energy dependence of the charge order reflection (1/3 1/3 7/2) has been analyzed in detail to investigate the charge disproportionation between the iron sites as a function of temperature. It is found that the charge disproportionation is constant within 0.02e across the Neel temperature T-N. The charge order reflection exhibits a decrease in intensity with increasing temperature which is attributed to an increase in the probability of electron hopping. We confirm the increase in polarization at T-N is not of static origin but rather dynamic. Our observations are consistent with antiferromagnetically aligned magnetic moments inhibiting the double exchange mechanism and reducing the probability of electrons hopping between Fe2+ and Fe3+ in the magnetic phase.

引用

页数：5

共 46 条

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