Low-frequency Excitation in the Optical Properties of Superconducting CeCoIn5
Low-frequency Excitation in the Optical Properties of Superconducting CeCoIn5
复制标题
超导 CeCoIn5 光学特性的低频激发
DOI：
10.1103/physrevb.80.064512
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发表时间：
2009
影响因子：
3.7
通讯作者：
C. Petrovic
中科院分区：
文献类型：
--
作者：
G. Rao;S. Ocadlik;M. Reedyk;C. Petrovic
用偏光干涉仪和He3低温恒温器研究了超导重费米子金属CeCoIn{sub5}在0.5-2.5K温度范围内5-40 cm{sup-1}的远红外光学响应。在低温下发现了一个强吸收特征，这似乎是态密度的间隙，这让人想起在Uru{sub2}Si{sub2}中在隐藏有序态中看到的能隙。从0.5K到2.5K，光谱结构的深度随着温度的升高而减小，表明这一行为的特征温度接近超导T{subC}。Kramers-Kronig导出的超导态的光导峰值出现在1.5 MeV的带隙上方。
The far-infrared optical response of CeCoIn{sub 5}, a superconducting heavy fermion metal with a T{sub C} of 2.3 K, was investigated from 5-40 cm{sup -1} at temperatures from 0.5-2.5 K using a polarizing interferometer and a He{sup 3} cryostat. A strong absorption feature is revealed at low temperatures which appears to be a gap in the density of states, reminiscent of the energy gap seen in the hidden order state in URu{sub 2}Si{sub 2}. The depth of the spectral structure decreases with increasing temperature from 0.5 to 2.5 K indicating that the characteristic temperature for this behavior is close to the superconducting T{sub C}. A peak in the superconducting state Kramers-Kronig-derived optical conductivity occurs just above the gap at 1.5 meV.