Structural Transition in the Hidden Ordered Phase of CeCoSi

Abstract

We have performed X-ray diffraction experiments on a single crystalline CeCoSi to investigate the unresolved ordered phase below $T_0\sim 12$ K. We have discovered that a triclinic lattice distortion takes place below $T_0$, which is further modified in the subsequent antiferromagnetic ordered phase. The structural domains can be selected by applying a magnetic field, indicating that some electronic ordering exists behind and affects the magnetic anisotropy in the hidden ordered phase below $T_0$. The transition at $T_0$, although the order parameter is still unknown, is associated with the maximum in the $c$-axis lattice parameter. In magnetic fields along $[1,0,0]$, the structural transition temperature, named as $T_{\text{s1}}$, deviates from $T_0$ and decreases with increasing the field, whereas $T_0$ increases. This shows that the hidden ordered phase without triclinic distortion exists between $T_{\text{s1}}$ and $T_0$. The results for $H\parallel [1,1,0]$ are also reported.

arXiv comment8 pages, 10 figures, 12 figures in the supplemental material, submitted to J. Phys. Soc. Jpn

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• Magnetic field-Temperature Phase Diagram of CeCoSi Constructed by Specific Heat, Magnetoresistivity, and Magnetization Measurements for a Single Crystal
• Ferroic quadrupolar ordering in CeCoSi revealed using ${}^{59}$Co-NMR measurements
• Observation of Electronic Structure Modification in the Hidden Order Phase of CeCoSi
• Mean-field Study of Antiferromagnetic and Antiferroquadrupolar Orderings in Tetragonal CeCoSi
• RKKY Interactions and Multipole Order in Ab initio Wannier Model of CeCoSi
• Three-stage Phase Transitions and Field-induced Phases in CeCoSi:A Landau Theory
• Kondo-Peierls transition with nonsymmorphic zone boundary gap formation
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