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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Pressure- and field-induced magnetic instabilities in a heavy-fermion antiferromagnet Ce_7Ni_3
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Pressure- and field-induced magnetic instabilities in a heavy-fermion antiferromagnet Ce_7Ni_3

机译：重费米反铁磁体Ce_7Ni_3中压力和磁场引起的磁不稳定性

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摘要

We investigated ground state properties of a heavy-fermion antiferromagnet Ce_7Ni_3 under hydrostatic pressures and magnetic fields. This compound undergoes two antiferromagnetic phase transitions at TN1 = 1.9 K and T_(N2 )= 0.7 K. Below T_(N1), a spin-density-wave (SDW) develops. Upon applying rather weak pressure 0.39 GPa = P_c, both T_(N1) and T_(K2) vanish, and non-Fermi liquid behavior appears in the specific heat and magnetic susceptibility. The enhancement of residual resistivity along the a axis near P_c is attributed to the increased spin fluctuations along the a axis. By applying fields B along the c axis, T_(N1 )is suppressed and vanishes at 0.3 T. Magnetoresistance, specific-heat, and magnetization measurements revealed another field-induced magnetic (FIM) phase in the region Bc> 0.7 T and T< 0.5 K. Neutron diffraction experiments indicate that the magnetic unit cell in the c-plane for the FIM phase is treble that of the chemical unit cell. Moreover, this magnetic reflection intensity remains even in the region between the FIM phase and SDW phase. This observation indicates the presence of large spin fluctuations in the c-plane associated with the magnetic frustration, which should be responsible for the magnetic instability of Ce_7Ni_3.
机译：我们研究了在流体静压力和磁场作用下重费米铁磁体Ce_7Ni_3的基态性质。该化合物在TN1 = 1.9 K和T_（N2）= 0.7 K时经历了两个反铁磁相变。在T_（N1）以下，产生了自旋密度波（SDW）。在施加相当弱的压力0.39 GPa = P_c时，T_（N1）和T_（K2）均消失，并且非费米液体行为出现在比热和磁化率中。沿靠近P_c的a轴的剩余电阻率的提高归因于沿a轴的自旋波动增加。通过沿c轴施加磁场B，T_（N1）被抑制并在0.3 T时消失。磁阻，比热和磁化强度测量显示出B c> 0.7 T区域中的另一场感应磁（FIM）相。 T <0.5K。中子衍射实验表明，FIM相在c面上的磁性晶胞是化学晶胞的三倍。而且，该磁反射强度即使在FIM相与SDW相之间的区域中也保持。该观察结果表明在c平面中存在与磁挫折有关的大自旋波动，这应该是Ce_7Ni_3的磁不稳定的原因。

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