Anisotropic Cooperative Jahn-Teller Effect and Metamagnetism in PrCu2

Rikio Settai, Singo Araki, Parhat Ahmet, Melike Abliz, Kiyohiro Sugiyama, Yoshichika Onuki, Terutaka Goto, Hiroyuki Mitamura, Tsuneaki Goto, Shigeru Takayanagi

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35 Citations (Scopus)

Abstract

We have studied the origin of the cooperative Jahn-Teller effect and the metamagnetic transition in the orthorhombic compound PrCu2. We have determined the anisotropic ferroquadrupole phase diagram by measuring the specific heat and thermal expansion under magnetic fields. With increasing the field, the Jahn-Teller transition temperature increases slightly for the field along a- and c-axes, while it decreases intensively along the b-axis. The phase diagram can be explained quantitatively by including the quadrupolar interaction of -KJT <Oxy> Oxy in the crystalline electric field and Zeeman Hamiltonian. The metamagnetic transition, which brings about the conversion between the easy (a)- and hard (c)-axes magnetization, has been also studied through the magnetostriction. This phenomenon is also explained quantitatively on the basis of the quadrupolar interaction of -KM <O22> O22. The sign of <O22> is found to be negative in the state where the c-axis is the hard one, while it changes from negative to positive above the metamagnetic transition field.

Original languageEnglish
Pages (from-to)636-644
Number of pages9
Journaljournal of the physical society of japan
Volume67
Issue number2
DOIs
Publication statusPublished - Feb 1998
Externally publishedYes

Keywords

  • Cooperative Jahn-Teller effect
  • Metamagnetism
  • PrCu
  • Quadrupole ordering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Settai, R., Araki, S., Ahmet, P., Abliz, M., Sugiyama, K., Onuki, Y., Goto, T., Mitamura, H., Goto, T., & Takayanagi, S. (1998). Anisotropic Cooperative Jahn-Teller Effect and Metamagnetism in PrCu2. journal of the physical society of japan, 67(2), 636-644. https://doi.org/10.1143/JPSJ.67.636