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Письма в Журнал экспериментальной и теоретической физики, 2001, том 73, выпуск 10, страницы 601–604
(Mi jetpl4400)
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Эта публикация цитируется в 105 научных статьях (всего в 105 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$_2$.
Поступила в редакцию: 12.04.2001
Образец цитирования:
V. A. Gasparov, N. S. Sidorov, I. I. Zver'kova, M. P. Kulakov, “Electron Transport in Diborides: Observation of Superconductivity in ZrB$_2$”, Письма в ЖЭТФ, 73:10 (2001), 601–604; JETP Letters, 73:10 (2001), 532–535
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/jetpl4400 https://www.mathnet.ru/rus/jetpl/v73/i10/p601
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