压力诱导CeCoSi中磁振子激发的逐渐增强
Gradual pressure-induced enhancement of magnon excitations in CeCoSi
摘要：
CeCoSi是一种金属间反铁磁体，具有非常不寻常的温度-压力相图：在环境压力下，它在$T_{\mathrm{N}} = 8.8$ K以下有序，而静水压的应用诱导了一种新的磁有序相，具有在1.5 GPa下$\sim40$ K的异常高的转变温度。我们通过弹性和非弹性中子散射（INS）和热容测量研究了CeCoSi的磁性和压力诱导磁相。在环境压力下，CeCoSi有序形成简单的相称AFM结构，其有序矩仅为$m_{\mathrm{Ce}} = 0.37(6)$ $μ_{\mathrm{B}}$。比热和低能量INS表明在反铁磁相的低能量磁振子激发谱的显着差距，与CEF激发位于10毫电子伏以上。流体静压逐渐向更高的能量转移的磁振子带的能量，在1.5 GPa测量的磁振子的温度依赖性是一致的相图。此外，CEF激发在压力下也急剧修改。
英文摘要：
CeCoSi is an intermetallic antiferromagnet with a very unusual temperature-pressure phase diagram: at ambient pressure it orders below $T_{\mathrm{N}} = 8.8$ K, while application of hydrostatic pressure induces a new magnetically ordered phase with exceptionally high transition temperature of $\sim40$ K at 1.5 GPa. We studied the magnetic properties and the pressure-induced magnetic phase of CeCoSi by means of elastic and inelastic neutron scattering (INS) and heat capacity measurements. At ambient pressure CeCoSi orders into a simple commensurate AFM structure with a reduced ordered moment of only $m_{\mathrm{Ce}} = 0.37(6)$ $μ_{\mathrm{B}}$. Specific heat and low-energy INS indicate a significant gap in the low-energy magnon excitation spectrum in the antiferromagnetic phase, with the CEF excitations located above 10 meV. Hydrostatic pressure gradually shifts the energy of the magnon band towards higher energies, and the temperature dependence of the magnons measured at 1.5 GPa is consistent with the phase diagram. Moreover, the CEF excitations are also drastically modified under pressure.
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