Unusual weak magnetic exchange in two different structure types: YbPt2Sn and 
YbPt2In

Gruner, T.; Jang, D.; Steppke, A.; Brando, M.; Ritter, F.; Krellner, C.; Geibel, C.

doi:10.1088/0953-8984/26/48/485002

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Unusual weak magnetic exchange in two different structure types: YbPt₂Sn and YbPt₂In

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/persons/resource/persons126630

Gruner, T.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons138493

Jang, D.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126863

Steppke, A.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126548

Brando, M.
Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126614

Geibel, C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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引用

Gruner, T., Jang, D., Steppke, A., Brando, M., Ritter, F., Krellner, C., & Geibel, C. (2014). Unusual weak magnetic exchange in two different structure types: YbPt₂Sn and YbPt₂In. Journal of Physics: Condensed Matter, 26(48):, pp. 1-10. doi:10.1088/0953-8984/26/48/485002.

引用: https://hdl.handle.net/11858/00-001M-0000-0024-9BF4-A

要旨

We present the structural, magnetic, thermodynamic and transport properties of the two new compounds YbPt2Sn and YbPt2In. X-ray powder diffraction shows that they crystallize in different structure types, the hexagonal ZrPt2Al and the cubic Heusler type, respectively. Despite quite different lattice types, both compounds present very similar magnetic properties: a stable trivalent Yb3+, no evidence for a sizeable Kondo interaction and very weak exchange interactions with a strength below 1 K as deduced from specific heat C(T). Broad anomalies in C(T) suggest short range magnetic ordering at about 250 mK and 180 mK for YbPt2Sn and YbPt2Sn, respectively. The weak exchange and the low ordering temperature result in a large magnetocaloric effect as deduced from the magnetic field dependence of C(T), making these compounds interesting candidates for magnetic cooling. In addition we found in YbPt2Sn evidences for a charge density wave transition at about 290 K. The occurrence of such transitions within several RET2X compound series (RE = rare earth, T = noble metal, X = In, Sn) is analyzed.