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We report on the synthesis and measurements of the temperature dependence of resistivity, R(T), the penetration depth, l(T), and upper critical magnetic field, Hc2(T), for polycrystalline samples of dodecaboride ZrB12 and diboride MgB2. We conclude t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0411116
Autor:
Gasparov, V. A., Kulakov, M. P., Sidorov, N. S., Zver'kova, I. I., Filipov, V. B., Lyashenko, A. B., Paderno, Yu. B.
We report on measurements of the temperature dependence of resistivity, $\rho(T)$, for single crystal samples of ZrB$_{12}$, ZrB$_{2}$ and polycrystalline samples of MgB$_{2}$. It is shown that cluster compound ZrB$_{12}$ behaves like a simple metal
Externí odkaz:
http://arxiv.org/abs/cond-mat/0406615
Raman spectra of the MgB2 ceramic samples were measured as a function of pressure up to 32 GPa at room temperature. The spectrum at normal conditions contains a very broad peak at ~590 cm-1 related to the E2g phonon mode. The frequency of this mode e
Externí odkaz:
http://arxiv.org/abs/cond-mat/0110511
Autor:
Kolesnikov, N. N., Kulakov, M. P.
Superconducting at 40 K MgB2 -samples were obtained by direct reaction from elements in molybdenum crucibles under argon pressure. Pressure allows to provide annealing at temperature up to 1400oC, that resulting in rise of Tc and compactness of the c
Externí odkaz:
http://arxiv.org/abs/cond-mat/0107164
Autor:
Nefyodov, Yu. A., Trunin, M. R., Shevchun, A. F., Shovkun, D. V., Kolesnikov, N. N., Kulakov, M. P., Gallitto, A. Agliolo, Fricano, S.
The real $R_s(T)$ and imaginary $X_s(T)$ parts of the surface impedance $Z_s(T)=R_s(T)+iX_s(T)$ in polycrystalline MgB$_2$ samples of different density with the critical temperature $T_c\approx 38$ K are measured at the frequency of 9.4 GHz and in th
Externí odkaz:
http://arxiv.org/abs/cond-mat/0107057
Publikováno v:
Physica C v.363 pp. 194-197 (2001)
Measurements of the superconducting transition temperature Tc have been performed by the inductive method on MgB2 at pressures up to 28 GPa. Tc decreases with applied pressure, exhibiting a cusp at about 9 GPa. We interpret the appearance of this ano
Externí odkaz:
http://arxiv.org/abs/cond-mat/0105475
We report on syntheses and electron transport properties of polycrystalline samples of diborides (AB2) with different transition metals atoms (A=Zr,Nb,Ta). The temperature dependence of resistivity, \rho(T), and ac susceptibility of these samples rev
Externí odkaz:
http://arxiv.org/abs/cond-mat/0104323