Anomalous Hall Effect in t2gt_{2g} Orbital Kagome Lattice due to Non-collinearity:Significance of Orbital Aharonov-Bohm Effect

A new mechanism of spin structure-driven anomalous Hall effect (AHE) in tilted ferromagnetic metals is proposed by taking account of the d-orbital degree of freedom. We find that a conduction electron acquires a Berry phase due to the complex d-orbital wavefunction, in the presence of non-collinear spin structure and the spin orbit interaction. The AHE driven by this orbital-derived Berry phase is much larger than the AHE induced by spin chirality, and it naturally explains the salient features of spin structure-driven AHE in pyrochlore Nd$_2$Mo$_2$O$_7$. Since the proposed AHE can occur even for coplanar spin orders ($M_z=0$), it is expected to emerge in other interesting geometrically frustrated systems.Comment: 5 page

LF seismogenic emissions and its application on the earthquake prediction

The authors are building a multi-point network system for the prediction of earthquake epicenter location by means of the seismogenic emission phenomena around Tokyo area. The network system consists of eight observation points with 50 km from each other and at each point a new digital type direction finding detector is set up with two loop sensors tuned to 82kHz. The output signals of the receivers are added into the digital vector composition circuit to obtain the direction angle of the source point,and this signal is transmitted to the center computer through a telemeter line. In order to protect from local man-made noise interferences,the warning is only anounced when the computation results of the center computer pointed one small area with high cross-corelation values for area from between all points.The source mechanism of emission related to precursors of earthquakes can be explained as electtromagnetic emissions for the rocks around the focus when they are crushed completely by the distortion pressure.And these emission energies are propagated in the ground along the boun-dary surface of the fault as a surface wave mode and radiated from the slit antenna which consists of the boundary at the ground surface of the fault.The authors will present the computer flow and try to explain the source mechanism of these emission in this paper.利用は著作権の範囲内に限られ