29,576 research outputs found

    Specific heat study of spin-structural change in pyrochlore Nd2_2Mo2_2O7_7

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    By measurements of specific heat, we have investigated the magnetic field (HH) induced spin-structural change in Nd2_2Mo2_2O7_7 that shows spin-chirality-related magneto-transport phenomena. A broad peak around 2 K caused by the ordering of 2-in 2-out structure of the Nd moments at zero HH shifts to the lower temperature (TT) up to around 3 T and then to the higher TT above around 3 T with increasing HH for all the direction of HH. This is due to the crossover from antiferromagnetic to ferromagnetic arrangement between the Nd and Mo moments. While the peak TT increases monotonically above 3 T for HH//[100], another peak emerges around 0.9 K at 12 T for HH//[111], which is ascribed to the ordering of 3-in 1-out structure. For HH//[110], a spike like peak is observed at around 3 T, which is caused perhaps by some spin flip transition.Comment: 5 pages, 4 figure

    The lipid composition and its alteration during the growth stage in pathogenic fungus, epidermophyton floccosum

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    Qualitative and quantitative changes of lipid components during the growth stages were studied in E. floccosum. The acyl group components of total lipids of Trichophyton rubrum and Microsporum cookei were also examined. The lipids of E. floccosum amounted to approximately 4% of the dry cell weight. Neutral lipids mainly consisted of triglycerides and sterols, and major polar lipids were phosphatidylcholine, phosphatidylethanolamine, and an unknown lipid X. The fatty acids in tryglycerides and phospholipids were palmitic, palmitoleic, stearic, oleic, and linoleic acids. The unknown polar lipid X which appeared between phosphatidylethanolamine and cardiolipin on thin layer chromatography plates contained no phosphorus. There was no significant change in the fatty acid components of E. floccosum and T. rubrum during the cell growth, whereas profound changes occurred in M. cookei. The sterol components of E. floccosum showed striking changes depending on the growth stage

    Degree-constrained Subgraph Reconfiguration is in P

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    The degree-constrained subgraph problem asks for a subgraph of a given graph such that the degree of each vertex is within some specified bounds. We study the following reconfiguration variant of this problem: Given two solutions to a degree-constrained subgraph instance, can we transform one solution into the other by adding and removing individual edges, such that each intermediate subgraph satisfies the degree constraints and contains at least a certain minimum number of edges? This problem is a generalization of the matching reconfiguration problem, which is known to be in P. We show that even in the more general setting the reconfiguration problem is in P.Comment: Full version of the paper published at Mathematical Foundations of Computer Science (MFCS) 201

    Multiple Broken Symmetries in Striped La2βˆ’x_{2-x}Bax_{x}CuO4_{4} detected by the Field Symmetric Nernst Effect

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    We report on a thermoelectric investigation of the stripe and superconducting phases of the cuprate La2βˆ’x_{2-x}Bax_{x}CuO4_{4} near the x=1/8x=1/8 doping known to host stable stripes. We use the doping and magnetic field dependence of field-symmetric Nernst effect features to delineate the phenomenology of these phases. Our measurements are consistent with prior reports of time-reversal symmetry breaking signatures above the superconducting TcT_{{\rm c}}, and crucially detect a sharp, robust, field-invariant peak at the stripe charge order temperature, TCOT_{{\rm {\scriptscriptstyle CO}}}. Our observations suggest the onset of a nontrivial charge ordered phase at TCOT_{{\rm {\scriptscriptstyle CO}}}, and the subsequent presence of spontaneously generated vortices over a broad temperature range before the emergence of bulk superconductivity in LBCO
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