La substitution effect on the magnetic phase transition of SmTi2Al20. (January 2016)

• Record Type: Journal Article
• Authors: Higashinaka, Ryuji; Yamada, Akira; Matsuda, Tatsuma D.; Aoki, Yuji
• Is Part Of: Journal of physics. Volume 683(2016)
• Publication Date: 2016-01
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/683/1/012018
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: Powder X-ray and specific heat measurements were performed on (Smx La1-x Ti2 Al20 (x = 0.2-1) single crystals grown by the Al self-flux method. All samples crystallize in the CeCr2 Al20 -type structure with Fd¯3m symmetry and the lattice parameter changes almost linearly with respect to the Sm concentration. From a λ-type peak appearing in the specific heat, it was found that the antiferromagnetic phase transition occurring at 6.5 K for x = 1 remains in the large Sm-concentration range. The transition temperature decreases almost linearly depending on the Sm concentration and goes to zero at the finite Sm concentration value of ∼ 0.1, indicating the possible existence of a quantum critical point. The robustness of the phase boundary against the magnetic field remains even in the La-substituted system. This behavior is in marked contrast to the field-sensitive behavior observed in Ce-based heavy fermion compounds.