Cycloidal Magnetic Ordering in Noncentrosymmetric EuIrGe${}_3$

Abstract

Successive magnetic phase transitions at $T_{\text{N}}$=12.2 K, $T_{\text{N}}^{\prime }$=7.0 K, and $T_{\text{N}}^{\ast }$=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 $q=({\delta }^{\prime },0,0.8)$ (${\delta }^{\prime }\sim 0.017$) and $m_q\parallel ac\text{-plane}$ in the intermediate phase ($T_{\text{N}}^{\ast }<T<T_{\text{N}}^{\prime }$). In the low temperature phase ($T<T_{\text{N}}^{\ast }$), the cycloidal plane rotates by $45^{\circ }$ to have $q=(\delta ,\delta ,0.8)$ ($\delta \sim 0.012$). 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.

5 pages, 6 figures, 7 figures in the supplemental material, accepted for publication in J. Phys. Soc. Jpn

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• High-field depinned phase and planar Hall effect in skyrmion-host Gd${}_2$PdSi${}_3$
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