We report the magnetotransport and thermal properties of RuAs_(2) single crystal.RuAs_(2) exhibits semiconductor behavior and localization effect.The crossover from normal state to diffusive transport in the weak loca...We report the magnetotransport and thermal properties of RuAs_(2) single crystal.RuAs_(2) exhibits semiconductor behavior and localization effect.The crossover from normal state to diffusive transport in the weak localization(WL)state and then to variable range hopping(VRH)transport in the strong localization state has been observed.The transitions can be reflected in the measurement of resistivity and Seebeck coefficient.Negative magnetoresistance(NMR)emerges with the appearance of localization effect and is gradually suppressed in high magnetic field.The temperature dependent phase coherence length extracted from the fittings of NMR also indicates the transition from WL to VRH.The measurement of Hall effect reveals an anomaly of temperature dependent carrier concentration caused by localization effect.Our findings show that RuAs_(2) is a suitable platform to study the localized state.展开更多
Low-temperature thermal conductivity(κ),as well as the magnetic properties and specific heat,are studied for the frustrated zigzag spin-chain material Sr Er_(2)O_(4)by using single-crystal samples.The specific heat d...Low-temperature thermal conductivity(κ),as well as the magnetic properties and specific heat,are studied for the frustrated zigzag spin-chain material Sr Er_(2)O_(4)by using single-crystal samples.The specific heat data indicate the longrange antiferromagnetic transition at~0.73 K and the existence of strong magnetic fluctuations.The magnetizations at very low temperatures for magnetic field along the c axis(spin chain direction)or the a axis reveal the field-induced magnetic transitions.Theκshows a strong dependence on magnetic field,applied along the c axis or the a axis,which is closely related to the magnetic transitions.Furthermore,high magnetic field induces a strong increase ofκ.These results indicate that thermal conductivity along either the c axis or the a axis are mainly contributed by phonons,while magnetic excitations play a role of scattering phonons.展开更多
基金Project supported by the National Key Research and Development Program of China (Grant Nos.2023YFA1406500 and 2019YFA0308602)the National Natural Science Foundation of China (Grant Nos.12104011,12274388,12074425,52102333,12104010,12204004,and 11874422)the Natural Science Foundation of Anhui Province (Grant Nos.2108085QA22 and 2108085MA16)。
文摘We report the magnetotransport and thermal properties of RuAs_(2) single crystal.RuAs_(2) exhibits semiconductor behavior and localization effect.The crossover from normal state to diffusive transport in the weak localization(WL)state and then to variable range hopping(VRH)transport in the strong localization state has been observed.The transitions can be reflected in the measurement of resistivity and Seebeck coefficient.Negative magnetoresistance(NMR)emerges with the appearance of localization effect and is gradually suppressed in high magnetic field.The temperature dependent phase coherence length extracted from the fittings of NMR also indicates the transition from WL to VRH.The measurement of Hall effect reveals an anomaly of temperature dependent carrier concentration caused by localization effect.Our findings show that RuAs_(2) is a suitable platform to study the localized state.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.U1832209 and 11874336)the University of Tennessee(H D Zhao)was supported by the NSF with Grant No.NSF-DMR-2003117。
文摘Low-temperature thermal conductivity(κ),as well as the magnetic properties and specific heat,are studied for the frustrated zigzag spin-chain material Sr Er_(2)O_(4)by using single-crystal samples.The specific heat data indicate the longrange antiferromagnetic transition at~0.73 K and the existence of strong magnetic fluctuations.The magnetizations at very low temperatures for magnetic field along the c axis(spin chain direction)or the a axis reveal the field-induced magnetic transitions.Theκshows a strong dependence on magnetic field,applied along the c axis or the a axis,which is closely related to the magnetic transitions.Furthermore,high magnetic field induces a strong increase ofκ.These results indicate that thermal conductivity along either the c axis or the a axis are mainly contributed by phonons,while magnetic excitations play a role of scattering phonons.
