Collective heavy-fermion state and superconductivity in Pr 1-x La x Os 4 Sb 12 : A specific heat study
Collective heavy-fermion state and superconductivity in Pr 1-x La x Os 4 Sb 12 : A specific heat study
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Pr 1-x La x Os 4 Sb 12 中的集体重费米子态和超导性：比热研究
DOI：
10.1103/physrevb.73.014515
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发表时间：
2006
影响因子：
3.7
通讯作者：
B. Andraka
中科院分区：
文献类型：
--
作者：
C. Rotundu;Pradeep Kumar;B. Andraka
报道了${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{Os}}_{4}{\mathrm{Sb}}_{12}\phantom{\rule{0.3em}{0ex}}(0\ensuremath{\leqslant}x\ensuremath{\leqslant}1)$.单晶的低温磁化率和比热由Pr的晶态电场能谱表征的材料的离子性质不受La掺杂的影响。平均晶胞参数受La取代的影响很小，且在不同化合物间近似呈线性变化。在${T}_{c}$的比热除以温度$C/T$的不连续性从$x=0$时的约$800\phantom{\rule{0.3em}{0ex}}\mathrm{mJ}∕{\mathrm{K}}^{2}\phantom{\rule{0.3em}{0ex}}\mathrm{mol}$急剧减小到${\mathm{laos}}_{4}{\mathm{sb}}_{12}$的值，接近$x=0.3$。超导相变的这种行为意味着重费米子态在${\mathm{pros}}_{4}{\mathm{Sb}}_{12}$中的集体起源。我们认为，反铁四极序参数的涨落是造成这种重费米子态的原因。
We report the low-temperature susceptibility and specific heat for single crystals of ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{Os}}_{4}{\mathrm{Sb}}_{12}\phantom{\rule{0.3em}{0ex}}(0\ensuremath{\leqslant}x\ensuremath{\leqslant}1)$. The ionic properties of the material, characterized by the energy spectrum of crystalline electric field (CEF) levels of Pr, are unchanged by La doping. The average ${T}_{c}$ is only weakly affected by La substitution and varies approximately linearly between the end compounds. The discontinuity in the specific heat divided by temperature $C∕T$ at ${T}_{c}$ is drastically reduced from about $800\phantom{\rule{0.3em}{0ex}}\mathrm{mJ}∕{\mathrm{K}}^{2}\phantom{\rule{0.3em}{0ex}}\mathrm{mol}$ for $x=0$ to the value of ${\mathrm{LaOs}}_{4}{\mathrm{Sb}}_{12}$ near $x=0.3$. This behavior of a superconducting transition implies a collective origin of the heavy-fermion state in ${\mathrm{PrOs}}_{4}{\mathrm{Sb}}_{12}$. We suggest that fluctuations of the anti-ferro-quadrupolar order parameter are responsible for this heavy-fermion state.
影响因子：
3.7
作者：
Bauer, ED;Frederick, NA;Maple, MB
通讯作者：
Maple, MB
重费米子超导体 PrOs_4Sb_<12> 中磁场感应四极有序的证据
DOI：
--
发表时间：
2003
期刊：
J.Phys.Soc.Jpn. Vol.72 No.5
影响因子：
--
作者：
日高芳樹;甲斐昌一;et al.;M.Kohgi et al.
通讯作者：
M.Kohgi et al.