四方晶系
铁磁性
正交晶系
反铁磁性
类型(生物学)
结晶学
凝聚态物理
磁性
联轴节(管道)
物理
顺磁性
材料科学
中子衍射
晶体结构
磁化
化学
磁场
量子力学
生物
冶金
生态学
作者
D. P. Kozlenko,N. T. Dang,S. E. Kichanov,Le Thi Phuong Thao,A. V. Rutkaukas,E. V. Lukin,B. N. Savenko,N. Tran,D.T. Khan,L.V. Truong-Son,L. H. Khiem,Bo Wha Lee,The-Long Phan,Ngoc-Loan Phan,Nguyen Truong Tho,Nguyen N. Hieu,T. A. Tran,M. H. Phan
出处
期刊:Physical review
日期:2022-03-24
卷期号:105 (9)
被引量:3
标识
DOI:10.1103/physrevb.105.094430
摘要
${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ represents a model system for probing geometrically frustrated magnetism, and studying the magnetic behavior of the material under high pressure could yield new insights into the magnetostructural coupling and structurally driven magnetic ordering transitions that are otherwise not observable at ambient pressure. We report here a systematic study of the crystal and magnetic structures of ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ at high pressure up to 37 and 20 GPa using x-ray and neutron powder diffraction techniques, respectively. We find that upon compression, the crystal structure transforms from the initial tetragonal hausmannite phase of $I{4}_{1}/amd$ symmetry into the orthorhombic ${\mathrm{CaMn}}_{2}{\mathrm{O}}_{4}$-type ($Pbcm$ symmetry) phase via the intermediate orthorhombic ${\mathrm{CaTi}}_{2}{\mathrm{O}}_{4}$-type ($Bbmm$ symmetry) phase. In the tetragonal phase, the application of pressure, $P>2$ GPa, leads to the suppression of low-temperature incommensurate and commensurate antiferromagnetic (AFM) orders with a propagation vector $k=(0,\ensuremath{\sim}0.5,0)$, and the expansion of the Yafet-Kittel-type ferrimagnetic phase, becoming the only ground state. As a result, the magnetic ordering temperature ${T}_{\mathrm{N}}$ increases rapidly, from \ensuremath{\sim}43 K at $P=0\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$ to \ensuremath{\sim}100 K at $P=10\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$. In the orthorhombic ${\mathrm{CaMn}}_{2}{\mathrm{O}}_{4}$-type phase, the AFM ordering on the sublattice of ${\mathrm{Mn}}^{3+}$ spins with a propagation vector $k=(1/2,0,0)$ occurs below ${T}_{\mathrm{N}}=275\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ for $P=20\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$. This value of ${T}_{\mathrm{N}}$ is about six times greater than that obtained at ambient pressure for the tetragonal phase, indicating a strong pressure enhancement of the magnetic ordering temperature in ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$. These experimental observations have been complemented by density functional theory calculations, which shed light on the underlying mechanisms of the structurally coupled magnetic phenomena in geometrically frustrated magnetic systems under high pressure.
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