Magnetic phases in UNi2Si2

Pavel Svoboda, Pavel Javorský, Fuminori Honda, Vladimír Sechovský, Alois A. Menovsky

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The tetragonal compound UNi2Si2 exhibits in zero magnetic field three different antiferromagnetic phases below TN = 124 K. They are formed by ferromagnetic basal planes, which are antiferromagnetically coupled along the c-axis with the propagation vector q = (0, 0, qz). Two additional order-order magnetic phase transitions are observed below TN, namely at T1 = 108 K and T2 = 40 K in zero magnetic field. All three phases exhibit strong uniaxial anisotropy confining the U moments to a direction parallel to the c-axis. UNi2Si2 single crystals were studied in detail by measuring bulk thermodynamic properties, such as thermal expansion, resistivity, susceptibility, and specific heat. A microscopic study using neutron dffraction was performed in magnetic fields up to 14.5 T parallel to the c-axis, and a complex magnetic phase diagram has been determined. Here, we present the analysis of specific-heat data measured in magnetic fields up to 14 T compared with the results of the neutron-diffraction study and with other thermodynamic properties of UNi2Si2.

Original languageEnglish
Pages (from-to)157-178
Number of pages22
JournalCentral European Journal of Physics
Volume2
Issue number2
Publication statusPublished - 2004 Apr 1
Externally publishedYes

Keywords

  • Antiferromagnetism
  • Magnetocaloric effect
  • Specific heat
  • Uraniun intermetallic compound

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Svoboda, P., Javorský, P., Honda, F., Sechovský, V., & Menovsky, A. A. (2004). Magnetic phases in UNi2Si2. Central European Journal of Physics, 2(2), 157-178.