Isotropic and Anisotropic Regimes of the Field-Dependent Spin Dynamics in Sr2IrO4: Raman Scattering Studies

A major focus of experimental interest in Sr2IrO4 has been to clarify how the magnetic excitations of this strongly spin-orbit coupled system differ from the predictions of anisotropic 2D spin-1/2 Heisenberg model and to explore the extent to which strong spin-orbit coupling affects the magnetic properties of iridates. Here, we present a high-resolution inelastic light (Raman) scattering study of the low energy magnetic excitation spectrum of Sr2IrO4 and doped Eu-doped Sr2IrO4 as functions of both temperature and applied magnetic field. We show that the high-field (H>1.5 T) in-plane spin dynamics of Sr2IrO4 are isotropic and governed by the interplay between the applied field and the small in-plane ferromagnetic spin components induced by the Dzyaloshinskii-Moriya interaction. However, the spin dynamics of Sr2IrO4 at lower fields (H<1.5 T) exhibit important effects associated with interlayer coupling and in-plane anisotropy, including a spin-flop transition at Hc in Sr2IrO4 that occurs either discontinuously or via a continuous rotation of the spins, depending upon the in-plane orientation of the applied field. These results show that in-plane anisotropy and interlayer coupling effects play important roles in the low-field magnetic and dynamical properties of Sr2IrO4.Comment: 8 pages, 4 figures, submitte

Intangible Investments and the Pricing of Corporate SGA Expenses

This study examined whether the market fully prices the reported Selling, General, and Administrative (SGA) expenses when this item includes an intangible investment component. For a sample of intangible investment-intensive firms, we showed that their SGA expenses benefit future operating performances. Evidence suggests some degree of market inefficiency in the pricing of SGA expenses and the intangible investment component. Furthermore, the financial analysts do not appear to appreciate fully the future benefits of the component in their earnings forecasts. Finally, the pertinent disclosures in firms’ annual reports are so inadequate as to attenuate the market mispricing, suggesting a significant room for future improvement

Aplikasi Analisis Konjoin untuk Mengukur Preferensi Mahasiswa Fmipa Usu dalam Memilih Produk Pasta Gigi

Analisis konjoin adalah suatu teknik analisis yang digunakan untukmenentukan tingkat kepentingan yang relatif berdasarkan persepsi pelanggan yangdibawa oleh suatu produk tertentu dan nilai kegunaan yang muncul dari atribut-atribut produk terkait. Analisis konjoin juga dapat diterapkan untuk menetukanstrategi pemasaran, uji coba konsep produk baru, maupun menentukan komposisiproduk yang disukai oleh konsumen. Dalam penelitian ini ditujukan untuk meng-analisis preferensi mahasiswa Fakultas Matematika dan Ilmu Pengetahuan AlamUniversitas Sumatera Utara dalam memilih produk pasta gigi. Penelitian ini jugamenggunakan data primer yang diperoleh dari penyebaran kuesioner kepada maha-siswa serta data skunder untuk mendapatkan jumlah mahasiswa FMIPA USU yangmasih aktif kuliah. Dari hasil penelitian ini menunjukan bahwa stimuli-stimuliyang disajikan dalam bentuk kuesioner, responden dapat membuat penilaian dalammerangkingkan kombinasi produk pasta gigi yang paling disukai hingga yang tida

Simple and scalable growth of AgCl nanorods by plasma-assisted strain relaxation on flexible polymer substrates

Implementing nanostructures on plastic film is indispensable for highly efficient flexible optoelectronic devices. However, due to the thermal and chemical fragility of plastic, nanostructuring approaches are limited to indirect transfer with low throughput. Here, we fabricate single-crystal AgCl nanorods by using a Cl 2 plasma on Ag-coated polyimide. Cl radicals react with Ag to form AgCl nanorods. The AgCl is subjected to compressive strain at its interface with the Ag film because of the larger lattice constant of AgCl compared to Ag. To minimize strain energy, the AgCl nanorods grow in the [200] direction. The epitaxial relationship between AgCl (200) and Ag (111) induces a strain, which leads to a strain gradient at the periphery of AgCl nanorods. The gradient causes a strain-induced diffusion of Ag atoms to accelerate the nanorod growth. Nanorods grown for 45 s exhibit superior haze up to 100% and luminance of optical device increased by up to 33%. ? The Author(s) 2017.114Ysciescopu

The U.S. versus international ethics codes for accountants: A computerized content analysis

Abstract. This study applies computerized content analysis techniques, including term frequency analysis, readability index, and cosine similarity, to compare the U.S. versus international ethics codes for professional accountants. It reveals and compares new characteristics of these ethics codes. The U.S. ethics code is found to be less readable but more reflective of moral values concerning social order. The international ethics code emphasizes the independence and confidentiality principles, while the U.S. ethics code emphasizes independence and responsibilities. There are more similarities within the U.S. ethics code and within the international ethics code than between these ethics code

Structural contributions to the pressure-tuned charge-density-wave to superconductor transition in ZrTe3: Raman scattering studies

Superconductivity evolves as functions of pressure or doping from charge-ordered phases in a variety of strongly correlated systems, suggesting that there may be universal characteristics associated with the competition between superconductivity and charge order in these materials. We present an inelastic light (Raman) scattering study of the structural changes that precede the pressure-tuned charge-density-wave (CDW) to superconductor transition in one such system, ZrTe3. In certain phonon bands, we observe dramatic linewidth reductions that accompany CDW formation, indicating that these phonons couple strongly to the electronic degrees of freedom associated with the CDW. The same phonon bands, which represent internal vibrations of ZrTe3 prismatic chains, are suppressed at pressures above ~10 kbar, indicating a loss of long-range order within the chains, specifically amongst intrachain Zr-Te bonds. These results suggest a distinct structural mechanism for the observed pressure-induced suppression of CDW formation and provide insights into the origin of pressure-induced superconductivity in ZrTe3.Comment: 6 pages, 5 figure