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arXiv 1003.2723cond-mat.str-el
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Cd掺杂CeIn $_3$的磁性、热性质和输运性质

Magnetic, thermal and transport properties of Cd doped CeIn$_3$

N. Berry, E. M. Bittar, C. Capan, P. G. Pagliuso, Z. Fisk

摘要:

通过测量样品的磁化率、比热和电阻率,研究了Cd掺杂对重费米子反铁磁体CeIn $_3$的影响.用Cd掺杂对Neel温度T $_{N}$的抑制比用Sn掺杂更显著。然而,掺杂诱导的量子临界点似乎在该系统中是不可实现的。在$T_N$的磁熵和电阻率的最大值的温度也被系统地抑制与镉,而有效力矩和居里-外斯温度在顺磁状态下不受影响。这些结果表明,Cd局部破坏其相邻的Ce时刻的AFM秩序,而不影响Ce的价态。此外,低于$T_N$的比热的温度依赖性与纯CeIn和Cd掺杂CeIn $_3$中的3D磁振子不一致,这一点在以前对CeIn $_3$的研究中被遗漏,并且与该系统中的量子临界类型有关。

英文摘要:

We have investigated the effect of Cd substitution on the archetypal heavy fermion antiferromagnet CeIn$_3$ via magnetic susceptibility, specific heat and resistivity measurements. The suppression of the Neel temperature, T$_{N}$, with Cd doping is more pronounced than with Sn. Nevertheless, a doping induced quantum critical point does not appear to be achievable in this system. The magnetic entropy at $T_N$ and the temperature of the maximum in resistivity are also systematically suppressed with Cd, while the effective moment and the Curie-Weiss temperature in the paramagnetic state are not affected. These results suggest that Cd locally disrupts the AFM order on its neighboring Ce moments, without affecting the valence of Ce. Moreover, the temperature dependence of the specific heat below $T_N$ is not consistent with 3D magnons in pure as well as in Cd-doped CeIn$_3$, a point that has been missed in previous investigations of CeIn$_3$ and that has bearing on the type of quantum criticality in this system.

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