[en] Specific heat and thermoelectric power measurements were carried out for In₂Bi and InBi using single crystals. Applying an external field at the specific heat measurement of In₂Bi enabled us to estimate a magnitude of the specific-heat discontinuity between the normal and superconducting states at a transition temperature. Debye temperatures were estimated to be 92(±8) K for In₂Bi and 120(±15) K for InBi below 5 K. Thermoelectric power of InBi was found to be anisotropic against the crystallographic axes

[en] We investigated Nd concentration dependence of the superconducting transition temperature, T_C, and magnetic transition temperature, T_N, for the R_1-xNd_xNi₂B₂C (R=Y and Er) systems. T_C and T_N curves against x for the R=Er system cross over at the substitution concentration x∼0.165, for which T_N=5 K, but T_C could not be observed. In the meanwhile, T_C and T_N curves for the R=Y system did not cross over. The phase diagram, (T_C, T_N) against Nd concentration x, for the R_1-xNd_xNi₂B₂C systems are given and discussed

[en] The variations of the superconducting transition temperature Tc and the magnetic transition temperature T_N as a function of the Nd concentration x in R_1-xNd_xNi₂B₂C (R = Y, Ho, and Er) systems is systematically studied by the measurements of electrical resistivity and magnetization. It is found that the Nd substitution in R_1-xNd_xNi₂B₂C show an effect to break Cooper pairs. The de Gennes scaling on the variation of Tc is also discussed

[en] Applied magnetic field dependence of thermal conductivity (TC) and the temperature dependences of resistivity and magnetization on the nickel borocarbide superconducting compound LuNi₂B₂C have been measured in the temperature range from 4.2 to 30 K, under the applied magnetic field range of 0-8 T. The magnetic field dependence of the TC showed characteristic behavior at the lower and the upper critical fields at temperatures below T_c. We present the first temperature dependence curve of upper critical field derived from the results of TC measurement of LuNi₂B₂C

[en] Short communication

[en] Nuclear magnetic resonance on oriented ⁷³Se in an iron host has been observed at about 7mK. From resonance-shift measurement, the magnetic hyperfine-splitting frequency μ_M, g-factor and magnetic hyperfine field were derived as μ_M=102.61(3)MH_z, |g(9/2⁺)|=0.188(16) and B_HF(⁷³SeFe)=716(81)kG. The experimental values of the g-factors of the g_9/2 neutron states, in the neighborhood of the neutron number 40, are compared with the theoretical values based on the core-polarization model. (author)

[en] The g-factor of the 1⁺ isomeric state of 9.3 m ¹⁷⁸Ta has been measured using the technique of nuclear magnetic resonance on oriented nuclei at about 7 mK. The magnetic hyperfine-splitting frequency was determined to be 201.56(22) MHz for zero external magnetic field in Ni. With a magnetic hyperfine field B_hf = 96.5(3) kG, the g-factor was derived as |g(¹⁷⁸Ta, 1⁺)| = 2.740(12). (author)

[en] ¹⁷⁵Ta and ¹⁷⁷Ta nuclei were oriented at low temperature as dilute impurities in Fe. The magnetic hyperfine splitting frequencies ν=⁺μB sub(HF)/Ih⁺ of the ¹⁷⁵Ta and ¹⁷⁷Ta ground states have been measured to be 320.45(11) and 317.552(55) MHz by using the technique of NMR-ON. Taking the known hyperfine field of ¹⁸¹Ta in Fe, the magneticmoments have been deduced: ⁺μ(¹⁷⁵Ta, 7/2⁺)⁺=2.270(45) and ⁺μ(¹⁷⁷Ta, 7/2⁺)⁺=2.250(45)μ sub(N). These values of the magnetic moments are discussed in the framework of the rotational model. (author)

[en] The decay of ⁵⁶Co to the levels of ⁵⁶Fe has been investigated using low-temperature nuclear orientation in the hyperfine magnetic field in iron. Based on the anisotropies of the γ rays, the following spin assignments are established: 4⁺ (4100.2-and 4298.0-keV levels) and 3⁺ (4119.8-and 4395.0-keV levels). Multipole mixing ratios of a number of γ transitions are reported. In addition, upper limits of the Fermi to Gamow-Teller matrix element ratios of the two 4⁺-4⁺ electron capture and β⁺ transitions to the 4100.2-and 4289.0-keV levels are obtained. (author)

[en] A series of Dy_1-xLu_xNi₂B_2C (x=0-1) compounds have been investigated by X-ray diffraction and by examining the temperature dependences of electrical resistivity, magnetization and heat capacity. All the samples exhibit the same LuNi₂B₂C-type structure; and lattice parameters depend almost linearly on the Lu concentration x. The superconducting transition temperature T_c decreases rapidly with increasing x, and superconductivity disappears at approximately x=0.2, then increases with a further increase in x. The magnetic transition temperature T_M and the effective magnetic moment P_eff decrease gradually with increasing x. The ferrimagnetic-like behavior emerges at about x=0.2; which can be the main reason causing the suppression of superconductivity. The temperature dependence of the magnetic entropy S_m originated from Dy ions has been evaluated on the basis of heat capacity data. The saturated values of S_m(T)/(1-x) are approximately 90% of R ln4 and the effective magnetic moment normalized by Dy concentration is almost unchanged, which indicates that the magnetic ground state of Dy³⁺ does not show a pronounced change. (author)