Possible Existence of Partially Disordered Sm Ions in Magnetically Ordered State of Ising Magnet SmPt2Si2: A Single Crystal Study
Abstract
We have succeeded in growing single crystals of SmPt2Si2 and have performed electrical resistivity, magnetization, and specific heat measurements. The magnetic susceptibility shows that SmPt2Si2 is an Ising magnet with a crystalline-electric-field ground state of Jz = ±3/2. We have found the existence of two magnetically ordered states, i.e., an antiferromagnetically (AFM) ordered phase (I) setting in at TN = 5.1 K and a field-induced magnetization plateau phase (II). In phase I, unlike the usual AFM states, a pronounced Curie-Weiss contribution remains in magnetic susceptibility, indicating the existence of "partially disordered" Sm ions. A largely enhanced Sommerfeld coefficient [350 mJ/(K2·mol)] in phase I can be attributed to the formation of a Kondo sublattice with heavy quasiparticles in partially disordered Sm ions. These findings may reflect substantial magnetic frustrations inherent in SmPt2Si2.
- Publication:
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Journal of the Physical Society of Japan
- Pub Date:
- November 2014
- DOI:
- 10.7566/JPSJ.83.113708
- arXiv:
- arXiv:1409.8474
- Bibcode:
- 2014JPSJ...83k3708F
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Materials Science
- E-Print:
- 13 pages, 7 figures, 1 table, to appear in J. Phys. Soc. Jpn. Vol.83, (2014)