Magnetic phase diagram of UCoAl

Tatsuma D. Matsuda, Naoyuki Tateiwa, Etsuji Yamamoto, Yoshinori Haga, Yoshichika Ōnuki, Dai Aoki, Jacques Flouquet, Zachary Fisk

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We report precision c-axis magnetic measurements on a high-quality single crystal of the heavy fermion metamagnet UCoAl. The metamagnetic transition at H M changes from 1st order at low temperature to a crossover at high temperature. H M is nearly linearly increasing with increasing temperature up to a critical temperature T 0 . The critical temperature T 0 is determined from both the field and the temperature dependences of magnetization to be ∼ 11 K. The field dependence of the Sommerfeld coefficient γ is estimated from M(T) by using a Maxwell relation. γ(H) shows a step-like decrease at H M . This behavior is consistent with the previous reports of specific heat and resistivity measurements at low temperatures.

Original languageEnglish
Pages (from-to)575-578
Number of pages4
JournalJournal of the Korean Physical Society
Issue number3
Publication statusPublished - 2013 Aug


  • Metamagnetism
  • Phase diagram
  • UCoAl


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