Schottky anomaly and Néel temperature treatment of possible perturbed hydrogenated AA-stacked graphene, SiC, and h-BN bilayers

The potential of manipulating the electronic heat capacity and Pauli susceptibility of hydrogenated AA-stacked graphene, silicon carbide, and hexagonal boron nitride bilayers is studied.

Тепловое расширение зонных ферромагнетиков Co-=SUB=-2-=/SUB=-MeAl (Me = Ti, V, Cr, Mn, Fe, Ni)

The thermal expansion coefficient (TEC) of Co_2MAl (M = Ti, V, Cr, Mn, Fe, Ni) band ferromagnets is measured in the temperature interval of 80–900 K. The magnetic-fluctuation contribution α_ m , _sf( T ) = α_ m ( T ) + α_sf( T ) to TEC comprised of negative Stoner α_ m ( T ) and positive spin-fluctuation α_sf( T ) contributions is presented. It is assumed that the contribution of α_ m ( T ) component is proportional to the square of spontaneous magnetization. The contribution of α_sf( T ) is stipulated by the effects of inducing local magnetic moments by spin fluctuations and is proportional to the Pauli susceptibility.

EXTREMELY LOW DENSITY OF STATES IN CePd7

The low temperature specific heat and magnetic susceptibility measurements, up to room temperature, on CePd 7 are reported. The Sommefeld coefficient γ and the Pauli susceptibility χo were found to have the lowest values within the Ce compounds: γ = 9.8 mJ/mole K 2 and χo = 0.14 × 10−3 emu/mole . The ratio χo/γ = 0.014 emu K 2/ J is that of a free electron, instead of an intermediate valence system (0.036 emu K 2/ J ). Such a value suggests complete delocalization of the Ce 4f electrons.

ELECTRONIC STRUCTURE AND PROPERTIES OF LaTiO3 AND LaNiO3

The band structures of the perovskite oxides LaTiO 3 AND LaNiO 3 calculated for the first time are reported here. The band structures were done using the Linear Muffin Tin Orbital (LMTO) method. The Fermi energy, density of states at the Fermi energy and the number of electrons in the conduction band were all determined. These quantities were used to calculate the electronic specific heat coefficient and the Pauli paramagnetic susceptibility. The Stoner parameter with regard to the enhancement in the Pauli susceptibility is calculated in the Thomas-Fermi approximation and is compared with the χ expt /χ bs value.