Discovery of Superconductivity and Electron-Phonon Drag in the Non-Centrosymmetric Semimetal LaRhGe$_3$
Mohamed OudahHsiang‐Hsi KungSamikshya SahuNiclas HeinsdorfArmin SchulzKai PhilippiMarta-Villa De Toro SanchezYipeng CaiKenji KojimaAndreas P. SchnyderH. TakagiB. KeimerD. A. BonnAlannah M. Hallas
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We present a comprehensive study of the non-centrosymmetric semimetal LaRhGe$_3$. Our transport measurements reveal evidence for electron-hole compensation at low temperatures, resulting in a large magnetoresistance of 3000% at 1.8 K and 14 T. The carrier concentration is on the order of $10^{21}\rm{/cm}^3$, higher than typical semimetals. We predict theoretically the existence of $\textit{almost movable}$ Weyl nodal lines that are protected by the tetragonal space group. We discover superconductivity for the first time in this compound with a $T_{\text c}$ of 0.39(1) K and $B_{\rm{c}}(0)$ of 2.1(1) mT, with evidence from specific heat and transverse-field muon spin relaxation ($\mu \rm{SR}$). LaRhGe$_3$ is a weakly-coupled type-I superconductor, and we find no evidence for time-reversal symmetry breaking in our zero-field $\mu \rm{SR}$. We study the electrical transport in the normal state and find an unusual $\sim T^{3}$ dependence at low temperature while Seebeck coefficient and thermal conductivity measurements reveal a peak in the same temperature range. We conclude that the transport properties of LaRhGe$_3$ in its normal state are strongly influenced by electron-phonon interactions. Furthermore, we examine the temperature dependent Raman spectra of LaRhGe$_3$ and find that the lifetime of the lowest energy $A_1$ phonon is dominated by phonon-electron scattering instead of anharmonic decay.Keywords:
Tetragonal crystal system
Muon spin spectroscopy
Abstract For all tetragonal lattice complexes the limiting complexes with cubic characteristic space-group type have been derived. These limiting complexes are caused by a specialization of the axial ratio c / a . However, they may require in addition special coordinate parameters.The limiting complexes have been determined with the aid of group-subgroup relationships. In order to check the material, the occurrence of cubic sphere packings within tetragonal lattice complexes was used. The results are presented in four separate tables referring to the 4 invariant, the 24 univariant, the 38 bivariant and the 48 trivariant tetragonal lattice complexes.
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Over the last decade, the research of magnetoresistance effect and its mechanism has been one of the research hotspot of condensed matter physics. With the synthesis, preparation and discovery of a variety of new materials and new structural systems which possess magnetoresistance effect, its mechanism and the complexity of magnetoresistance system are also constantly being unfolded. In all kinds of magnetoresistance system and magnetoresistance effect which have been found, the research of positive magnetoresistance system and positive magnetoresistance effect, as a branch of the magnetoresistance research system, has special research value in the magnetoresistance system, magnetoresistance mechanism and application of new magnetoresistive devices. This pa- per reviews the progress of positive magnetoresistance system, magnetoresistance effect and its mechanism, shows the diversity of the positive magnetoresistance system, positive magnetoresis- tance effect and its mechanism, and briefly points out some common problems that need to be fo- cused in the studies of the positive magnetoresistance system.
Colossal Magnetoresistance
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近十几年来，磁致电阻效应及其机理的研究一直是凝聚态物理领域的研究热点之一。随着具有磁阻效应的各种新材料及新结构体系的合成、制备与发现，磁阻体系及其磁阻机制的复杂性也不断被展现出来。在已发现的各类磁阻体系及磁阻效应中，正磁阻体系及正磁阻效应的研究，作为磁阻研究的一个分支，在磁阻体系、磁阻机理和新型磁阻器件应用方面，均具有特殊的研究价值。本文综述了正磁阻体系、正磁阻效应及其磁阻机理的研究进展，展示了正磁阻体系、正磁阻效应及其机理的多样性，并简要指出了正磁阻体系研究中需要关注的一些共性问题。 Over the last decade, the research of magnetoresistance effect and its mechanism has been one of the research hotspot of condensed matter physics. With the synthesis, preparation and discovery of a variety of new materials and new structural systems which possess magnetoresistance effect, its mechanism and the complexity of magnetoresistance system are also constantly being unfolded. In all kinds of magnetoresistance system and magnetoresistance effect which have been found, the research of positive magnetoresistance system and positive magnetoresistance effect, as a branch of the magnetoresistance research system, has special research value in the magnetoresistance system, magnetoresistance mechanism and application of new magnetoresistive devices. This paper reviews the progress of positive magnetoresistance system, magnetoresistance effect and its mechanism, shows the diversity of the positive magnetoresistance system, positive magnetoresis-tance effect and its mechanism, and briefly points out some common problems that need to be fo-cused in the studies of the positive magnetoresistance system.
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A tetragonal high-pressure phase of PtAs2 with I4/mmm symmetry was first discovered above 90 GPa by using first principle swarm intelligence structure search technique. The first order structure transition character of PtAs2 from the ambient-pressure cubic pyrite phase to this tetragonal HP phase was confirmed by a large volume reduction of 8.1%. During structure transition, the independent As2 dimers in the pyrite phase were twisted and connected with each other under compression to form three-dimensional As puckered networks in the tetragonal HP phase, accompanied by the increase of the coordination of Pt from 6 to 8. Compared to the semiconducting pyrite phase, the metallic feature of this tetragonal HP phase has been demonstrated by the electronic structure analyses.
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The muon spin rotation technique. Muon spin rotation in metals: localization, diffusion, trapping. Hyperfine fields at the +in metals. Study of dynamic effects in magnetism. Applications in superconductors. Muonium in matter. Muon spin rotation in insulators.
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The magnetothermopower and the magnetoresistance of single Co-Ni/Cu multilayered nanowires with various thicknesses of the Cu spacer are investigated. Both kinds of measurement are performed as a function of temperature (50--325 K) and under applied magnetic fields perpendicular to the nanowire axis, with magnitudes up to \ensuremath{-}15% at room temperature. A linear relation between thermopower $S$ and electrical conductivity \ensuremath{\sigma} of the nanowires is found, with the magnetic field as an implicit variable. Combining the linear behavior of the $S$ vs \ensuremath{\sigma} relation and the Mott formula, the energy derivative of the resistivity is determined. In order to extract the true nanowire materials parameters from the measured thermopower, a simple model based on the Mott formula is employed to distinguish the individual thermopower contributions of the sample. By assuming that the nondiffusive thermopower contributions of the nanowire can be neglected, it is found that the magnetic-field-induced changes of thermopower and resistivity are equivalent. The emphasis in the present paper is on the comparison of the magnetoresistance and magnetothermopower results and it is found that the same correlation is valid between the two sets of data for all samples, irrespective of the relative importance of the giant magnetoresistance or anisotropic magnetoresistance contributions in the various individual nanowires.
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Colossal Magnetoresistance
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