Magnetic and transport properties of single crystalline RCoxSn2 (R = Ce and La)

Minami Kimura,Yoshiya Uwatoko,Jun Gouchi,Kazuhei Wakiya,Takeru Tomaki,Masatomo Uehara,Izuru Umehara

doi:10.1063/1.5043042

Minami Kimura, Yoshiya Uwatoko + Show 5 more

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https://doi.org/10.1063/1.5043042

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Abstract

In this study, single crystals of CeCo0.39Sn2 and LaCo0.43Sn2 were grown by the Czochralski pulling method for the first time. These compounds crystallize to the orthorhombic CeNiSi2 type structure with the space group Cmcm. The inverse magnetic susceptibility χ−1 of CeCo0.39Sn2 obeys a Curie-Weiss law above 100 K. The effective magnetic moment is close to the value expected for the Ce3+ ion, indicating that the Ce 4f electrons in CeCo0.39Sn2 are well localized. No magnetic transition is observed down to 2 K. However, the specific heat exhibits an upturn upon cooling below 8 K, suggesting that a magnetic order would occur below 2 K.

Highlights

Cerium based intermetallic compounds have been extensively investigated because they exhibit a variety of strongly correlated electron phenomena such as the heavy fermion state, valence fluctuation, and unconventional superconductivity.[1]
The obtained single crystal sample was CeCo0.39Sn2 (Ce3Co1.17Sn6) with the CeNiSi2 type structure[5] which is closely related to the Yb3CoSn6-type structure
We report the anisotropic magnetic properties of CeCo0.39Sn2 single crystal for the first time

Summary

Introduction

Cerium based intermetallic compounds have been extensively investigated because they exhibit a variety of strongly correlated electron phenomena such as the heavy fermion state, valence fluctuation, and unconventional superconductivity.[1]. Gribanova et al reported that Ce3RuSn6 exhibits a ferromagnetic transition under the strong influence of the Kondo effect.[3] This compound crystallizes to the Yb3CoSn6-type structure with the space group Cmcm.[4] To obtain a new ferromagnetic Ce compound, we attempted to synthesize “Ce3CoSn6” by the Czochralski pulling method. The obtained single crystal sample was CeCo0.39Sn2 (Ce3Co1.17Sn6) with the CeNiSi2 type structure (space group: Cmcm)[5] which is closely related to the Yb3CoSn6-type structure. In this compound, the magnetic and transport properties on polycrystalline samples were only available to our best knowledges.[6] For isostructural RT xSn2 (R: rare earth, T : transition metal), the variety of complex magnetic structures have been reported.[7]

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