Magnetovolume effects and the p-T magnetic phase diagram of UNi2Si2

Fuminori Honda, Vladimir Sechovský, Gendo Oomi, Alexander V. Andreev, Alois A. Menovsky

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The thermal expansion of single-crystalline UNi2Si2 along the a and c axes has been measured with high accuracy. The linear thermal expansion is found to be highly anisotropic and to show a spontaneous magnetostriction. In the ground state, the spontaneous volume magnetostriction reaches 4 × 10-4. The lattice volume changes abruptly at T1 = 43 K and T2 = 103 K, where UNi2Si2 undergoes the magnetic phase transitions. When increasing temperature, a considerable volume expansion (by 3.6 × 10-8 m3 mol-1) at T1 and tiny shrinkage (by 6.5 × 10-10 m3 mol-1) at T2 have been observed. On the other hand, no apparent volume effect is observed around the magnetic ordering temperature TN = 124 K. Thermal expansion data are analyzed using thermodynamic relations in order to elucidate the previously published pressure dependences of temperatures of magnetic phase transitions T1, T2, and TN.

Original languageEnglish
Article number184417
Pages (from-to)1844171-1844175
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number18
Publication statusPublished - Nov 1 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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