Structural and dynamical study of moment localization inβ-Mn1−xInx

Abstract

We have used neutron scattering and muon spin relaxation (µSR) to investigate the structural and magnetic properties of the β-phase of elemental manganese doped with dilute amounts of indium. β-Mn is an example of a topologically frustrated antiferromagnetically correlated metal -but which remains paramagnetic at all temperatures. The addition of In to β-Mn results in a vast volume expansion of the lattice, and would therefore be expected to have a major effect on the stability and localization of the Mn moment -as observed in, for example, Ru and Al doped β-Mn alloys. We find that In doping in β-Mn results in a short-range ordered spin-glass like ground state, similar to that of Al-doped β-Mn but with residual low frequency spin fluctuations. This is in contrast to Ru doping which results in the stabilization of a long-range ordered Mn moment

High-temperature short-range order in Mn3RhSi

“…In the case of β-Mn, the former 12-fold site is coordinated by near-neighbor (NN) Mn atoms with a distance of 2.66 Å, whereas the latter 8-fold site is surrounded by NN Mn atoms with a distance of 2.36 Å. The long and short bond lengths are consistent with the localized and itinerant natures of Mn 3d electrons at these sites, respectively 20 .…”

“…6. Although this SRO state has not been confirmed in other compounds, magnetic diffuse scattering has been observed in β-Mn 24 20 , and β-Mn 1-x Al x 23 . Notably, diffuse scattering occurs in β-Mn 24 , but the intensity decreases with decreasing temperature, and almost disappears at low temperatures.…”

“…However, nuclear diffuse scattering may be included in Fig. 2a, as observed 20 . In the case of Mn 3 RhSi, nuclear diffuse scattering at Q = 0.8 Å −1 is not observed in the X-ray diffraction pattern, as shown in Fig.…”

“…This tool has been successfully applied for studies of phase separations in materials near the quantum phase transition 3 . In addition, the spin-lattice relaxation rate of μSR assists in our assessment of the magnetism 20 . Vertical bonds correspond to the J 5 ferromagnetic interaction described in ref.…”

Sub-Kelvin magnetic order in Sm3Ga5O12 single crystal

“…However, there is considerable confusion over the blanket term "hyperkagomé"; the confusion stems from the degrees of freedom in which each of the trimers can be bent in space. Such hyperkagomé structures can be found in a variety of systems outside of the garnet structure, including but by no means limited to β-Mn [36], the trillium lattice [37], and the kagomé staircase lattice [38]. Recent studies have focused on another hyperkagomé structure derived from the popular pyrochlore lattice; it is possible to extend the phase diagram of spin ices, first proposed by dan Hertog and Gingras [11,39], to the hyperkagomé pyrochlore lattice, which is exhibited by such materials as Na 4 Ir 3 O 8 [40].…”