Giant generic topological Hall resistivity of MnSi under pressure

Abstract

We report detailed low temperature magnetotransport and magnetization measurements in MnSi under pressures up to $\sim12\,{\rm kbar}$. Tracking the role of sample quality, pressure transmitter, and field and temperature history allows us to link the emergence of a giant topological Hall resistivity $\sim50\,{\rm n\Omega cm}$ to the skyrmion lattice phase at ambient pressure. We show that the remarkably large size of the topological Hall resistivity in the zero-temperature limit must be generic. We discuss various mechanisms which can lead to the much smaller signal at elevated temperatures observed at ambient pressure

Skyrmion lattice with a giant topological Hall effect in a frustrated triangular-lattice magnet

“…Figure 2C show the evolution of peak in T with temperature, respectively. Continuous decrease of T towards zero around 20 K suggests that this response is affected by the magnitude of the molecular field from 4f moment on the conduction electron through the f-d coupling, consistent with the scalar spin chirality model for THE (35). Having identified the emergence of a topological electromagnetic response in the A phase, we examined the Gd spin structure under H along the c axis, by the magnetic RXS in resonance with the Gd L2 edge.…”

Superconductivity and magnetism in noncentrosymmetric RhGe

“…In the silicides there have been found long-period helical structures [19], quantum phase transitions and partial order in the high-pressure phase [20,21], as well as vortexlike spin textures or skyrmions [22,23], which can be controlled by an electric current, inducing a topological Hall effect [24][25][26].…”

Optically Driven Collective Spin Excitations and Magnetization Dynamics in the Néel-type Skyrmion Host GaV4S8

“…Seminal examples, in this regard, include the realization of Floquet-Bloch states resulting from photon-surface-state hybridization in topological insulators [8,9] and helicity-dependent control of topological-surface currents [10]. Interest has also extended to magnetic topological defects known as skyrmions (Sks) [11], fueled by their importance in memory technology [12][13][14], spintronics [15], and emergent electromagnetism [16][17][18]. Recently, optical stimulus has been successfully used to write and erase individual Sks [19], confirm their topological robustness [20], and identify new metastable Sk states [21].…”