Anisotropic pseudogap in CeNiSn and CeRhSb studied by a thermal-conductivity measurement
Anisotropic pseudogap in CeNiSn and CeRhSb studied by a thermal-conductivity measurement
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通过热导率测量研究 CeNiSn 和 CeRhSb 中的各向异性赝能隙
DOI：
10.1103/physrevb.55.6421
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发表时间：
1997
影响因子：
3.7
通讯作者：
H. Fujii
中科院分区：
文献类型：
--
作者：
M. Sera;Norio Kobayashi;T. Yoshino;K. Kobayashi;T. Takabatake;G. Nakamoto;H. Fujii
我们测量了CeNiSn、CeNi{sub 0.95}M{sub 0.05}Sn （M=Co,Cu）和CeRhSb单晶的导热系数{kappa}。在CeNiSn和CeRhSb中，沿b轴{kappa}分别在5和10 K左右显著增强。在CeNiSn中，这种增强几乎完全被沿a轴施加15t的磁场（这是容易磁化的轴）或用5%的Co和Cu代替Ni所抑制。这些结果表明，沿b轴{kappa}的增强源于这些化合物中赝隙的打开。另一方面，在CeNiSn中沿a轴和CeRhSb中沿a、c轴{kappa}的增强远小于沿b轴的增强。{kappa}中的这些各向异性行为反映了这些化合物中间隙的各向异性。{版权所有}{ital 1997} {ital美国物理学会}
We have measured the thermal conductivity {kappa} for CeNiSn, CeNi{sub 0.95}M{sub 0.05}Sn (M=Co,Cu), and CeRhSb single crystals. The pronounced enhancement of {kappa} along the b axis is observed around 5 and 10 K in CeNiSn and CeRhSb, respectively. In CeNiSn, this enhancement is almost completely suppressed either by application of a magnetic field of 15 T along the a axis, which is the easy axis of magnetization, or by the substitution of 5{percent} Co and Cu for Ni. These results indicate that the enhancement of {kappa} along the b axis originates from the opening of the pseudogap in these compounds. On the other hand, the enhancement of {kappa} along the a axis in CeNiSn and those along the a and c axis in CeRhSb are much smaller than that along the b axis. These anisotropic behaviors in {kappa} reflect the anisotropy of the gap in these compounds. {copyright} {ital 1997} {ital The American Physical Society}