Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14

Parity Broken Chiral Spin Dynamics in Ba$_3$NbFe$_3$Si$_2$O$_{14}$

The spin wave excitations emerging from the chiral helically modulated 120$^{\circ}$ magnetic order in a langasite Ba$_3$NbFe$_3$Si$_2$O$_{14}$ enantiopure crystal were investigated by unpolarized and polarized inelastic neutron scattering. A dynamical fingerprint of the chiral ground state is obtained, singularized by (i) spectral weight asymmetries answerable to the structural chirality and (ii) a full chirality of the spin correlations observed over the whole energy spectrum. The intrinsic chiral nature of the spin waves elementary excitations is shown in absence of macroscopic time reversa…

Weak ferromagnetic order breaking the threefold rotational symmetry of the underlying kagomé lattice in CdCu$_3$(OH)$_6$(NO$_3$)$_2\cdot$H$_2$O

Novel magnetic phases are expected to occur in highly frustrated spin systems. Here we study the structurally perfect kagomé antiferromagnet CdCu$_3$(OH)$_6$(NO$_3$)$_2\cdot$H$_2$O by magnetization, magnetic torque, and heat capacity measurements using single crystals.An antiferromagnetic order accompanied by a small spontaneous magnetization that surprisingly is confined in the kagomé plane sets in at $T_\mathrm{N}\approx$4 K, well below the nearest-neighbor exchange interaction $J / k_B$ = 45 K.This suggests that a unique $\bf q = 0$ type 120$^\circ$ spin structure with "negative" (downward)…

Structural Chirality of beta-Mn

A theoretical study of Bragg diffraction by an enantiomorphic pair of structures should apply to patterns gathered on beta-Mn using resonance enhanced x-ray diffraction. The chiral polymorph of manganese, and structurally related compounds, will be more convenient than trigonal crystals of low-quartz, tellurium and berlinite used in previous structural studies of this type, because cubic symmetry removes some complications of correction for absorption and macroscopic birefringence. Intensity of a Bragg spot engaged by circular polarization in the primary beam of photons Y(h, k, l) is proposed …

3D Kagome晶格中的手性对称性与磁性：RPt$_2$B (R = La和Nd)原型晶体

Chiral symmetry and magnetism in a 3D Kagome lattice: RPt$_2$B (R = La and Nd) prototype crystals

本研究探讨了稀土铂硼化物RPt$_2$B中三维手性Kagome晶格的结构手性与磁有序的相互作用，揭示了手性反铁磁低能态、Kramers型Weyl点及反常霍尔电导率，阐明了手性、磁性与拓扑的复杂关联。

Quetzalcoatlite作为无杂质平台用于手性磁性与阻挫研究

Quetzalcoatlite as a Disorder-Free Platform for Chiral Magnetism and Frustration

研究以无杂质 kagome 磁体 quetzalcoatlite 为对象，通过从头算揭示其由层内与层间交换耦合竞争形成的三维手性磁态，该材料接近竞争磁 regime，或可通过调控实现量子自旋液体态。