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Magnetization Steps in Yb2Pt2Pb with the Shastry-Sutherland Lattice
Yasuyuki Shimura,Toshiro Sakakibara,Ken Iwakawa,Yoshichika Onuki,Kiyohiro Sugiyama 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We measured the DC magnetization of the antiferromagnet Yb2Pt2Pb (TN ~ 2.1 K) with theShastry-Sutherland lattice for two in-plane directions H k[100] and [110] down to 0.08 K. Multiplemetamagnetic transitions are found to develop in the field dependence of the magnetization M(H). Substantial anisotropy is observed in M(H) and is discussed on the basis of a two-sublattice modelwith strong Ising anisotropy along the orthogonal [110] ([1¯10]) directions recently proposed byOchiai et al.
Satoshi Okajima,Yasuyuki Shimura,Takahiro Onimaru 한국물리학회 2023 새물리 Vol.73 No.12
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.
Singlet-triplet Crossover in the Two-dimensional Dimer Spin System YbAl3C3
Shunichiro Kittaka,Tomoyoshi Sugiyama,Yasuyuki Shimura,Toshiro Sakakibara,Saori Matsuda,Akira Ochiai 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Low-temperature magnetization (M) measurements down to 0.1 K have been performed in magneticfields up to 14.5 T for a single piece of a tiny single-crystalline sample ( 0.2 mg weight) ofthe spin-gap system YbAl3C3. At the base temperature of 0.1 K, several metamagnetic transitionswere clearly observed for H k c in the range 6 T < µ0H < 9 T whereas only two transitions wereobserved, one at 4.8 T and the other at 6.6 T, for H k a. At fields above 9 T, the magnetization becomesalmost saturated for both H k a and H k c. The present results indicate that a singlet-tripletcrossover occurs in a relatively narrow field range, suggesting a rather weak interdimer interactionin spite of the nearly triangular lattice of Yb ions.