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[en] Highlights: • Gd1-xErxGe1.5 (0 ≤ x ≤ 1) were prepared by arc-melting. • Magnetic and thermodynamic properties of Gd1-xErxGe1.5 have been investigated. • The peaks due to magnetic ordering in specific heat were observed below 15 K for x ≥ 0.5. - Abstract: The specific heat C and the magnetization of Gd1−xErxGe1.5 were studied. From magnetization measurements, GdGe1.5 and ErGe1.5 showed antiferromagnetic ordering at the Néel temperatures TN of 29 K and 3 K, respectively. The jump in the C of Gd1−xErxGe1.5 due to the antiferromagnetic transition became small with increasing Er content, which is originated from the crystalline electric field effect and atomic randomness. Plots of C as a function of temperature for Gd1−xErxGe1.5 with x ≥ 0.5 exhibited a peak at temperatures below 15 K. These results suggest that TN could be controlled by substituting Er for Gd.
[en] From experimental and theoretical analyses of magnetic and specific-heat properties, we present the complete magnetic phase diagram of the quasi-1D antiferromagnet Cu(N2H5)2(SO4)2. On cooling and at zero magnetic field this compound enters a 1D regime with short-range magnetic correlations, marked by a broad maximum in the specific heat and magnetic susceptibility at K, followed by a tridimensional antiferromagnetically ordered phase below K induced by small interchain couplings. The intermediate-temperature 1D regime can be modeled using exact quantum-transfer-matrix calculations, which offer a compatible description of the nonmonotonic behavior of as a function of the magnetic field, giving K for the intrachain exchange parameter. The analysis of magnetic specific-heat and susceptibility data at low temperature indicates that the interchain exchange couplings are an order of magnitude smaller than the coupling inside the chains. (paper)
[en] Magnetic properties such as the magnetization, internal energy and specific heat for Heisenberg ferromagnet with spin - 1/2 on honeycomb lattice are have been calculated using Oguchi’s method. We have found that the magnetic specific heat exhibits two peaks
[en] The Gd - based pyrochlore Gd2Sn2O7 is an easy - planar anisotropic system. The CF anisotropy has a significant effect on the magnetic specific heat Cmag of this compound in the low temperature magnetic ordering regime. The Cmag is found to drop exponentially with Cmag ∝ 1/T2 exp (-Δ1/T) between 0.12 and 0.31 K with anisotropic energy gap Δ1 ≅ 1.3 ± 0.01 K induced by single-ion CF anisotropy. (author)
[en] Highlights: • The specific heat capacity of Ni83.5Ti16.5 eutectic alloy was determined. • The thermal diffusivity of undercooled liquid alloy was predicted. • The highly undercooled alloy displayed a dendritic microstructure. • A magnetic transition occurred at the temperature of 628 K. The specific heat capacity of undercooled liquid Ni83.5Ti16.5 eutectic alloy was experimentally determined by electromagnetic levitation and drop calorimeter techniques. It decreased from 39.39 to 38.63 J mol−1 K−1 when the liquid undercooling increased from 0 to 189 K. As for solid alloy, the specific heat capacity was measured by differential scanning calorimetry. It gradually reduced with decreasing temperature and dropped to 24.75 J mol−1 K−1 at the temperature of 293 K. In addition, the thermal diffusivity and eutectic growth kinetics of undercooled liquid alloy were analyzed in the light of the measured specific heat capacity.
[en] Magnetic field not only shifts and modifies the heavy fermion quasiparticle band, but also disturbs the distribution of residual exchange fields. An influence of the latter effect on the specific heat of non-magnetic heavy fermion systems is discussed
[en] Recent results from low-temperature specific heat and magnetization measurements performed on crystals of UFexAl12-x (3.8< x<5.8) are presented. The results confirm the previously proposed magnetic phase diagram and show the existence of three different low-temperature magnetic states
[en] The geometrically frustrated pyrochlores Gd2Hf2O7 (GdH) and Gd2Zr2O7 (GdZ) are easy planar anisotropic systems in which considerable single-ion crystal-field anisotropies of D3d symmetry are found in the ground multiplet 8S7/2 due to admixture of higher Russell-Saunders terms. The 8S7/2 splits into 4 doublets with total CF splitting 9.9 K in GdH and 9.4 K in GdZ. The magnetic specific heat Cmag follows a conventional T3 behavior in GdH and an unconventional T4.6 behavior in GdZ down to 0.4 K. (author)
[en] -RuCl crystallizes in a layered honeycomb structure and has been proposed as a candidate to realize a fractionalized Kitaev model with strongly frustrated, bond-dependent, anisotropic interactions between Ru magnetic moments (j = ). By introducing Cr as dopant to this Mott insulator (S = at the Ru sites), one can investigate changes of the long-range order in the ground state of -RuCl as well as of the anisotropic Kitaev interactions and field-induced effects which appear upon doping. We report on susceptibility and specific heat measurements of RuCrCl, probing the effect of different doping levels on the magnetic and thermodynamic properties on single crystals for the full range 0 x 1.
[en] We have succeeded in growing single crystals of hexagonal Ce3TiBi5 and orthorhombic CeTi3Bi4 by the Bi self-flux method. Measurements of electrical resistivity, magnetic susceptibility, and specific heat have been made on Ce3TiBi5 and CeTi3Bi4. The results indicate that both Ce3TiBi5 and CeTi3Bi4 are new Ce compounds with an antiferromagnetic ordering temperature of 5.0 and 3.4 K, respectively.