Ferromagnetic and spin-glass properties of single-crystalline U2NiSi3
نویسندگان
چکیده
A single crystal of U2NiSi3 was investigated by means of magnetization, electrical resistivity and heat capacity measurements. Whereas the DC magnetic data clearly manifest strongly anisotropic ferromagnetism, the AC magnetic susceptibility data are consistent with spin-glass behaviour, reported previously for polycrystalline samples. Moreover, no distinct anomalies around TC occur in the specific heat and electrical resistivity characteristics. Altogether the results obtained for single-crystalline U2NiSi3 indicate rather an unusual state of coexistence of ferromagnetism and spin-glass freezing.
منابع مشابه
A ferromagnet with a glass transition
– We introduce a finite-connectivity ferromagnetic model with a three-spin interaction which has a crystalline (ferromagnetic) phase as well as a glass phase. The model is not frustrated, it has a ferromagnetic equilibrium phase at low temperature which is not reached dynamically in a quench from the high-temperature phase. Instead it shows a glass transition which can be studied in detail by a...
متن کاملTheoretical Calculations of the Effect of Finite Length on the Structural Properties of Pristine and Nitrogen-doped Carbon Nanotubes
The effect of impurities on quantum chemical parameters of single-walled nanotubes (SWNTs) was studied using density functional theory (DFT). The density of states (DOS), Fermi energy and thermodynamic energies of (5,5) carbon nanotubes were calculated in the presence of nitrogen impurity. It was found that this nanotube remains metallic after being doped with one nitrogen atom. The partial den...
متن کاملCritical Behavior of the Bethe Lattice Spin Glass
We present results of a rigorous analysis of the k J king spin glass on the Bethe lattice with uncorrelated boundary conditions. We derive phase diagrams as functions of temperature 'us. percentage of ferromagnetic bonds, and, when half of the bonds are ferromagnetic, temperature 'us. external field. Critical exponents are also determined. Using bifurcation theory, we establish the existence of...
متن کاملترابرد الکتریکی وابسته به اسپین در ساختارهای نامتجانس Fe-MgO-Fe
In this paper, spin-dependent electrical transport properties are investigated in a single-crystal magnetic tunnel junction (MTJ) which consists of two ferromagnetic Fe electrodes separated by an MgO insulating barrier. These properties contain electric current, spin polarization and tunnel magnetoresistance (TMR). For this purpose, spin-dependent Hamiltonian is described for Δ1 and Δ5 bands in...
متن کاملParamagnetic spin pumping.
We have demonstrated spin pumping from a paramagnetic state of an insulator La2NiMnO6 into a Pt film. Single-crystalline films of La2NiMnO6 which exhibit a ferromagnetic order at TC≈270 K were grown by pulsed laser deposition. The inverse spin Hall voltage induced by spin-current injection has been observed in the Pt layer not only in the ferromagnetic phase of La2NiMnO6, but also in a wide te...
متن کامل