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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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When spins of s = 1/2 form a triangular lattice and antiferromagnetic interactions work between them, magnetic order is suppressed due to geometrical frustration. Our research is centered on Yb-based semiconductors Yb₂Cu<SUB>2n</SUB>S<SUB>n+3</SUB> (2 ≤ n ≤ 5) which crystallize in a trigonal CaAl₂Si₂-type structure. These semiconductors feature a defective triangular lattice made up of Yb ions. We synthesized two polycrystalline Yb₂Cu<SUB>2n</SUB>S<SUB>n+3</SUB>, with n values of 2.2 and 3.6. The former has a defect rate of 24% for Yb sites, while the latter has a defect rate of 45%. The specific heat and magnetization were measured down to 0.4 and 1.8 K, respectively. For n = 2.2, there was no indication of a phase transition. On the other hand, for n equal to 3.6, the specific heat exhibits a cusp at T₁ = 4.1 K and a peak at T₂ = 2.3 K. It is suggested that the deficiency of Yb sites in the triangular lattice induces phase transitions as a way to release geometrical frustration.
목차
I. INTRODUCTION
II. EXPERIMENTAL PROCEDURES
III. RESULTS AND DISCUSSION
IV. SUMMARY
REFERENCES
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