Unusual Nonmagnetic Ordered State in CeCoSi Revealed by ${}^{59}$Co-NMR and NQR Measurements

Abstract

We performed ${}^{59}$Co nuclear magnetic and quadrupole resonance (NMR and NQR) measurements under pressure on a single-crystalline CeCoSi, which undergoes an unresolved phase transition at $T_0$. The NQR spectra clearly showed that the phase transition at $T_0$ is nonmagnetic, but any symmetry lowering at the Co site was not seen irrespective of the feature of second-order phase transition. By contrast, the NMR spectra were split by the induced magnetic field perpendicular to the external magnetic field. These results show that the phase below $T_0$ is not a simple paramagnetic state but is most likely electric multipolar ordered state of Ce $4f$ electrons. The development of the Kondo effect by applying pressure is thought to be crucial to stabilize this state and to show novel features beyond commonality of tetragonal Ce-based systems.

6 pages, 4 figures

References in corpus (9)

• Nematic and meta-nematic transitions in the iron pnictides
• Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
• Hidden order and beyond: an experimental-theoretical overview of the multifaceted behavior of URu${}_2$Si${}_2$
• On the Symmetry of Low-Field Ordered Phase of PrFe4P12 : 31P NMR
• Odd-Parity Multipoles by Staggered Magnetic Dipole and Electric Quadrupole Orderings in CeCoSi
• NMR Observation of Ferro-quadrupole Order in PrTi2Al20
• NQR and NMR spectra in odd-parity multipole material CeCoSi
• Magnetic and superconducting properties on S-type single-crystal CeCu${}_2$Si${}_2$ probed by ${}^{63}$Cu nuclear magnetic resonance and nuclear quadrupole resonance
• Electronic nematicity in URu2Si2 revisited

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• Structural Transition in the Hidden Ordered Phase of CeCoSi
• Magnetic field-Temperature Phase Diagram of CeCoSi Constructed by Specific Heat, Magnetoresistivity, and Magnetization Measurements for a Single Crystal
• Structural Phase Transition and Possible Valence Instability of Ce$-4f$ Electron Induced by Pressure in CeCoSi
• Mean-field Study of Antiferromagnetic and Antiferroquadrupolar Orderings in Tetragonal CeCoSi
• Ferroic quadrupolar ordering in CeCoSi revealed using ${}^{59}$Co-NMR measurements
• Observation of Electronic Structure Modification in the Hidden Order Phase of CeCoSi
• RKKY Interactions and Multipole Order in Ab initio Wannier Model of CeCoSi
• Kondo-Peierls transition with nonsymmorphic zone boundary gap formation
• Microscopic Determination of the c-axis-Oriented Antiferromagnetic Structure in LaMnSi by ${}^{55}$Mn and ${}^{139}$La NMR