Magnetic phases and magnetoelastic phenomena in UNiGa under pressure

F. Honda, K. Prokeš, M. Olšovec, F. Bourdarot, P. Burlet, T. Kagayama, G. Oomi, L. Havela, V. Sechovský, A. V. Andreev, E. Brück, F. R. De Boer, A. A. Menovsky, M. Mihálik

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


UNiGa exhibits several antiferromagnetic (AF) phases below TN=39 K. The related magnetic phase transitions cause pronounced thermoexpansion anomalies of opposite sign for the c- and a-axes, respectively, leaving volume effects nearly negligible. Magnetic fields applied along the c-axis induce transitions from the AF phases to an uncompensated AF and/or to a ferromagnetic (F) phase accompanied by magnetostriction effects. Our results on pressure influence on the thermoexpansion and magnetostriction anomalies allow us to propose a tentative p-T magnetic phase diagram. A new AF phase induced by pressures above 1.8 GPa has been found. Neutron-diffraction studies under hydrostatic pressure up to 0.9 GPa and in magnetic fields up to 2 T confirmed that the critical temperatures and the critical fields of transitions of UNiGa are strongly pressure dependent (some phases are even suppressed) although relevant magnetic structures themselves remain essentially unchanged.

Original languageEnglish
Pages (from-to)495-498
Number of pages4
JournalJournal of Alloys and Compounds
Publication statusPublished - Jun 12 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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