Anisotropic pseudogap in CeNiSn and CeRhSb studied by a thermal-conductivity measurement
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چکیده
We have measured the thermal conductivity k for CeNiSn, CeNi0.95M 0.05Sn ~M5Co,Cu!, and CeRhSb single crystals. The pronounced enhancement of k 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% Co and Cu for Ni. These results indicate that the enhancement of k along the b axis originates from the opening of the pseudogap in these compounds. On the other hand, the enhancement of k 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 k reflect the anisotropy of the gap in these compounds. @S0163-1829~97!05510-0#
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تاریخ انتشار 1997