论文标题
非中心对称Euirge的环形磁顺序$ _3 $
Cycloidal Magnetic Ordering in Noncentrosymmetric EuIrGe$_3$
论文作者
论文摘要
连续的磁相过渡以$ t _ {\ text {n}} $ = 12.2 k，$ t _ {\ text {n}}^{\ prime} $ = 7.0 k，$ t _ {\ t _ {\ text {\ text {n}中子衍射和谐振X射线衍射研究了属于极空群$ i4mm $的四方晶格。结果表明，Euirge $ _3 $与$ q \ sim（0，0，0，0.792）$和$ m_ {q} \ Parallel c \ c \ partect {-axis} $在高温相（$ t _ {$ t _ { t _ {\ text {n}} $），它更改为$ q =（δ'，0，0.8）$（$Δ'\ sim 0.017 $）和$ m_ {q} \ parallel ac ac \ ac \ text {-plane} $ in Intermed阶段（$ t _ { t _ {\ text {n}}}^{\; \ prime} $）。在低温阶段（$ t <t _ {\ text {n}}}^{\;*} $），环形平面旋转$ 45^{\ circ} $具有$ q =（δ，δ，δ，0.8）$（$δ\ sim 0.012 $）。还可以指出，由于极性环境干扰了磁性级别的磁性偶极子，X射线散射幅度来自奇数磁性四极。
Successive magnetic phase transitions at $T_{\text{N}}$=12.2 K, $T_{\text{N}}^{\;\prime}$=7.0 K, and $T_{\text{N}}^{\;*}$=5.0 K in EuIrGe$_3$, an intermetallic compound with a body centered tetragonal lattice belonging to a polar space group $I4mm$, has been investigated by neutron diffraction and resonant X-ray diffraction. It is shown that EuIrGe$_3$ exhibits an incommensurate longitudinal sinusoidal order with $q\sim (0, 0, 0.792)$ and $m_{q} \parallel c\text{-axis}$ in the high temperature phase ($T_{\text{N}}^{\;\prime}< T < T_{\text{N}}$), which changes to a cycloidal order with $q=(δ', 0, 0.8)$ ($δ'\sim 0.017$) and $m_{q} \parallel ac\text{-plane}$ in the intermediate phase ($T_{\text{N}}^{\;*} < T < T_{\text{N}}^{\;\prime}$). In the low temperature phase ($T < T_{\text{N}}^{\;*}$), the cycloidal plane rotates by $45^{\circ}$ to have $q=(δ, δ, 0.8)$ ($δ\sim 0.012$). It is also pointed out that the X-ray scattering amplitude from odd-parity magnetic quadrupole due to the polar environment interfere with that from normal even-parity magnetic dipole in the magnetic ordered phase.
