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ЖУРНАЛЫ // Письма в Журнал экспериментальной и теоретической физики // Архив

Письма в ЖЭТФ, 2001, том 73, выпуск 10, страницы 601–604 (Mi jetpl4400)

Эта публикация цитируется в 106 статьях

КОНДЕНСИРОВАННЫЕ СРЕДЫ

Electron Transport in Diborides: Observation of Superconductivity in ZrB$_2$

V. A. Gasparov, N. S. Sidorov, I. I. Zver'kova, M. P. Kulakov

Institute of Solid State Physics, Russian Academy of Sciences

Аннотация: We report on syntheses and electron transport properties of polycrystalline samples of diborides (AB$_2$) with different transition metals atoms (A${}={}$Zr,Nb,Ta). The temperature dependence of resistivity, $\rho(T)$, and ac susceptibility of these samples reveal superconducting transition of ZrB$_2$ with $T_c=5.5\,$K, while NbB$_2$ and TaB$_2$ have been observed nonsuperconducting up to $0.37$ K. $H_{c2}(T)$ is linear in temperature below $T_c$, leading to a rather low $H_{c2}(0)= 0.1\,$T. At $T$ close to $T_c$ $H_{c2}$ $(T)$ demonstrates a downward curvature. We conclude that these diborides as well as MgB$_2$ samples behaves like a simple metals in the normal state with usual Bloch–Grüneisen temperature dependence of resistivity and with Debye temperatures: $280$, $460$ and $440$ K, for ZrB$_2$, NbB$_2$ and MgB$_2$, respectively, rather than $T^2$ and $T^3$ as previously reported for MgB$_2$.

PACS: 72.15.Gd, 74.70.Ad, 74.60.Ec,

Поступила в редакцию: 12.04.2001

Язык публикации: английский


 Англоязычная версия: Journal of Experimental and Theoretical Physics Letters, 2001, 73:10, 532–535

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