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Neutron Scattering Study of Antiferromagnet U₂Pt<SUB>6</SUB>Al<SUB>15</SUB>
Kyugo Ota,Yuji Matsumoto,Yuki Watabe,Koji Kaneko,Chihiro Tabata,Yoshinori Haga 한국물리학회 2023 새물리 Vol.73 No.12
We have performed the neutron scattering study of antiferromagnet U₂Pt<SUB>6</SUB>Al<SUB>15</SUB> with the honeycomb lattice to determine the magnetic structure. U₂Pt<SUB>6</SUB>Al<SUB>15</SUB> exhibits two phase transitions at Tm₁ = 9 K and Tm₂ = 26 K. In phase I at Tm₁ < T < Tm₂, the magnetic reections described by a propagation vector k<SUB>I</SUB> = (1/3, 0, 0) were observed. In phase II at T < Tm₁, magnetic reections of k<SUB>I</SUB> = (1/3, 0, 0) and k<SUB>II</SUB> = (1/2, 0, 0) were observed and the magnetic reection intensity of k<SUB>I</SUB> = (1/3, 0, 0) is weak but finite. The hysteresis in the temperature dependent intensities is observed across the phase transition at Tm1, suggesting that the transition at Tm1 is of first order.