Tricritical fluctuations and elastic properties of the Ising antiferromagnet UIrSi3

T. N. Haidamak, J. Valenta, J. Prchal, M. Vališka, J. Pospíšil, V. Sechovský, J. Prokleška, A. A. Zvyagin, F. Honda

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)


Elastic constants, thermal expansion, magnetostriction, and heat capacity measurements were performed with and without applied magnetic field on a single crystal of UIrSi3. The elastic properties were interpreted within the theory of the strain-exchange effect. The exchange-striction model together with the Ising model for the behavior of magnetic localized 5f electrons and itinerant electrons of uranium correctly reproduces the main features of our magneto-Acoustic experiments in UIrSi3. Data on thermal expansion and magnetostriction confirm the conclusion that the dominant contribution of the measured temperature and field change in the speed of sound comes from the change in the elastic modulus itself. Based on the analysis of heat capacity measurements in the magnetic field, we explain the significant anomalies at the second-order branch of the phase transition boundary as a manifestation of the tricritical fluctuations, dominating the region below the tricritical point. The outcome confirms the three-dimensional Ising model, at zero and low magnetic fields, with a crossover to the mean-field tricritical behavior at fields close to the tricritical point, where tricritical fluctuations dominate the temperature evolution of the given property.

ジャーナルPhysical Review B
出版ステータス出版済み - 4月 1 2022

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学


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