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Nonreciprocal transport in the superconducting state of the chiral crystal NbGe_(2)

Chinese Physics B 2024年第5期33卷 161-165页

作者：刘永来许锡童何苗赵海天曾庆祺杨星宇邹优鸣杜海峰屈哲 Anhui Key Laboratory of Low-Energy Quantum Materials and Devices CAS Key Laboratory of Photovoltaic and Energy Conservation MaterialsHigh Magnetic Field Laboratory of Chinese Academy of Sciences(CHMFL)HFIPSCAS Science Island Branch of Graduate School University of Science and Technology of China

Due to the lack of inversion,mirror or other roto-inversion symmetries,chiral crystals possess a well-defined handedness which,when combined with time-reversal symmetry breaking from the application of magnetic fields,can give rise to directional dichroism of the electrical transport phenomena via the magnetochiral *** this study,we investigate the nonreciprocal magneto-transport in microdevices of NbGe_(2),a superconductor with structural chirality.A giant nonreciprocal signal from vortex motions is observed during the superconducting transition,with the ratio of nonreciprocal resistance to the normal resistanceγreaching 6×10^(5)T^(-1)·A^(-1).Interestingly,the intensity can be adjusted and even sign-reversed by varying the current,the temperature,and the crystalline *** findings illustrate intricate vortex dynamics and offer ways of manipulation on the rectification effect in superconductors with structural chirality.

关键词： chiral crystals magnetochiral anisotropy superconducting vortex nonreciprocal transport

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Potential Prebiotic Relevance of Glycine Single crystals Enclosing Fluid Inclusions: An Experimental and Computer Simulation with Static Magnetic Fields

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Advances in Biological Chemistry 2020年第5期10卷 140-156页

作者： E. Angeles-Camacho J. Cruz-Castañeda A. Meléndez M. Colín-García K. Cervantes de la Cruz S. Ramos-Bernal A. Negrón-Mendoza G. Garza-Ramos P. Rodríguez-Zamora C. Camargo-Raya A. Heredia Instituto de Ciencias Nucleares Universidad Nacional Autónoma de México Mexico City México Facultad de Química Universidad Nacional Autónoma de México Ciudad Universitaria Mexico City México Programa de Maestría y Doctorado en Ciencias Químicas UNAM. Cd. Universitaria Mexico City México Instituto de Geología Universidad Nacional Autónoma de México Mexico City México Departamento de Física Coordinación de Ciencias de la Tierra Facultad de Ciencias Universidad Nacional Autónoma de México Mexico City México Departamento de Bioquímica Facultad de Medicina Universidad Nacional Autónoma de México Mexico City México Instituto de Física-UNAM Circuito de la Investigación Científica Ciudad Universitaria Mexico City México

Glycine crystallizes into three different polymorphs called α, β and γ under standard physicochemical conditions. They have different features depending on their structural variations. The possible interaction of glycine with magnetic minerals in meteorites and comets or in the ancient Earth, paves the way to study the self-assembly and molecular behavior under irradiation and magnetic conditions. The magnetic field might induce the formation of a specific polymorph of glycine. To gain insight on the consequences of gamma irradiation with a gradient of static magnetic fields (0.06 T, 0.3 T, 0.42 T and 0.6 T) on the self-assembly of single macroscopic glycine crystals, we gamma irradiated the powdered amino acid and then assembled single crystals from water solutions. The preliminary results showed a stable formation of fluid inclusions in the single crystals and no straightforward effect on the self-assem- bly process after glycine gamma irradiation and interaction with static magnetic fields. The α glycine polymorph single crystals formed at 55° from the magnetic longitudinal axis and seemed to be enhanced by gamma radiation. The γ-glycine single crystals presented L and D circular dichroism signals,

关键词： Glycine Polymorphs Fluid Inclusions Gamma Irradiation Chemical Evolution FT-IR Circular Dichroism chiral crystals

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