Scientific Highlights
Thomas Prokscha new President of ISMS
Thomas Prokscha from the Laboratory for Muon Spin Spectroscopy LMU and Head of the LEM Group has been announced as the new President of the International Society for μSR Spectroscopy (ISMS)
at the 14th International Conference on Muon Spin Rotation Relaxation and Resonance (μSR2017) in Sapporo, Japan.
Quantum Griffiths Phase Inside the Ferromagnetic Phase of Ni1-xVx
We study by means of bulk and local probes the d-metal alloy Ni1-xVx close to the quantum critical concentration, xc ≈ 11.6%, where the ferromagnetic transition temperature vanishes. The magnetization-field curve in the ferromagnetic phase takes an anomalous power-law form with a nonuniversal exponent that is strongly x dependent and mirrors the behavior in the paramagnetic phase.
Pressure-induced magnetic order in FeSe: A muon spin rotation study
The magnetic order induced by the pressure was studied in FeSe by means of muon spin rotation (μSR) technique.
Emergent magnetism at transition-metal-nanocarbon interfaces
Interfaces are critical in quantum physics, and therefore we must explore the potential for designer hybrid materials that profit from promising combinatory effects. In particular, the fine-tuning of spin polarization at metallo–organic interfaces opens a realm of possibilities, from the direct applications in molecular spintronics and thin-film magnetism to biomedical imaging or quantum computing.
Unconventional magnetic order in the conical state of MnSi
In the temperature-magnetic field phase diagram, the binary metallic compound MnSi exhibits three magnetic phases below Tc ≈ 29K.An unconventional helicoidal phase is observed in zero field. At moderate field intensity a conical phase sets in. Near Tc, in an intermediate field range, a skyrmion lattice phase appears.
Magnetic states of MnP: muon-spin rotation studies
Muon-spin rotation data collected at ambient pressure (p) and at p = 2.42 GPa in MnP were analyzed to check their consistency with various low- and high-pressure magnetic structures reported in the literature. Our analysis con rms that in MnP the low-temperature and low-pressure helimagnetic phase is characterised by an increased value of the average magnetic moment compared to the high-temperature ferromagnetic phase.
Ground state selection under pressure in the quantum pyrochlore magnet Yb2Ti2O7
A quantum spin liquid is a state of matter characterized by quantum entanglement and the absence of any broken symmetry. In condensed matter, the frustrated rare-earth pyrochlore magnets Ho2Ti2O7 and Dy2Ti2O7, so-called spin ices, exhibit a classical spin liquid state with fractionalized thermal excitations (magnetic monopoles).
Room-temperature helimagnetism in FeGe thin films
Chiral magnets are promising materials for the realisation of high-density and low-power spintronic memory devices. For these future applications, a key requirement is the synthesis of appropriate materials in the form of thin films ordering well above room temperature. Driven by the Dzyaloshinskii-Moriya interaction, the cubic compound FeGe exhibits helimagnetism with a relatively high transition temperature of 278 K in bulk crystals.
New magnetic phase in the nickelate perovskite TlNiO3
The RNiO3 perovskites are known to order antiferromagnetically below a material-dependent Néel temperature TN. We report experimental evidence indicating the existence of a second magnetically ordered phase in TlNiO3 above TN = 104K, obtained using nuclear magnetic resonance and muon spin rotation spectroscopy.