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Spin order and dynamics in the topological rare-earth germanide semimetals

Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 113-127页

作者： Yuhao Wang Zhixuan Zhen Jing Meng Igor Plokhikh Delong Wu Dariusz J.Gawryluk Yang Xu Qingfeng Zhan Ming Shi ekaterina pomjakushina Toni Shiroka Tian Shang Key Laboratory of Polar Materials and Devices(MOE) School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Laboratory for Multiscale Materials and Experiments Paul Scherrer InstitutVilligen PSI CH-5232Switzerland Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China Laboratory for Muon-Spin Spectroscopy Paul Scherrer InstitutVilligen PSI CH-5232Switzerland Laboratorium für Festkörperphysik ETH ZürichZürich CH-8093Switzerland

The REAl(Si,Ge)(RE=rare earth)family,known to break both the inversion-and time-reversal symmetries,represents one of the most suitable platforms for investigating the interplay between correlated-electron phenomena and topologically nontrivial ***,we report on systematic magnetic,transport,and muon-spin rotation and relaxation(μSR)measurements on(Nd,Sm)AlGe single crystals,which exhibit antiferromagnetic(AFM)transitions at T_(N)=6.1 and 5.9 K,*** addition,NdAlGe undergoes also an incommensurate-to-commensurate ferrimagnetic transition at 4.5 *** transverse-fieldμSR measurements confirm the AFM transitions,featuring a~90%magnetic volume ***-field(ZF)μSR measurements reveal a more disordered internal field distribution in NdAlGe than in SmAlGe,reflected in a larger transverse muon-spin relaxation rateλTat T<

关键词： magneticWeyl semimetals topological Hall effect spin fluctuations μSR

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Novel Synthesis Method of Nonst0ichiometric Na2-xlrO3 Crystal Structure, Transport and Magnetic Properties

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Journal of Chemistry and Chemical Engineering 2016年第4期10卷 153-160页

作者： Katharina Rolfs ekaterina pomjakushina Denis Sheptyakov Kazimierz Conder Laboratory for Scientific Development and Novel Materials Paul Scherrer Institute Hlligen PSI 5232 Switzerland Laboratory for Neutron Scattering and lmaging Paul Scherrer Institute Villigen PSI 5232 Switzerland

Transition metal oxides with 4d or 5d metals are of great interest due to the competing interactions, of the Coulomb repulsion and the itineracy of the d-electrons, opening a possibility of building new quantum ground states. Particularly the 5d metal oxides containing Iridium have received significant attention within the last years, due to their unexpected physical properties, caused by a strong spin orbit coupling observed in It（IV）. A prominent example is the Mott-insulator Sr2IrO4. Another member of this family, the honeycomb lattice compound Na2IrO3, also being a Mott-insulator having, most probably, a Kitaev spin liquid ground state. By deintercalating sodium from Na2IrO3, the authors were able to synthesize a new honeycomb lattice compound with more than 50% reduced sodium content. The reduction of the sodium content in this layered compound leads to a change of the oxidation state of iridium from ＋ IV to ＋ V/＋ VI and a symmetry change from C2/c to P-3. This goes along with significant changes of the physical properties. Besides the vanishing magnetic ordering at 15 K, also the transport properties changes and instead insulating semiconducting properties are observed.

关键词： Strongly correlated electron systems iridates oxidation neutron diffraction

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