2011年7月
Pressure-induced changes in the magnetic and valence state of EuFe2As2
PHYSICAL REVIEW B
- 巻
- 84
- 号
- 2
- 開始ページ
- 024502
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.84.024502
- 出版者・発行元
- AMER PHYSICAL SOC
We present the results of electrical resistivity, ac specific heat, magnetic susceptibility, x-ray absorption spectroscopy (XAS), and x-ray magnetic circular dichroism (XMCD) of the ternary iron arsenide EuFe2As2 single crystal under pressure. Applying pressure leads to a continuous suppression of the antiferromagnetism associated with Fe moments and the antiferromagnetic transition temperature becomes zero in the vicinity of a critical pressure P-c similar to 2.5-2.7 GPa. Pressure-induced reentrant superconductivity, which is highly sensitive to the homogeneity of the pressure, only appears in the narrow pressure region in the vicinity of P-c due to the competition between superconductivity and the antiferromagnetic ordering of Eu2+ moments. The antiferromagnetic state of Eu2+ moments changes to the ferromagnetic state above 6 GPa. We also found that the ferromagnetic order is suppressed with further increasing pressure, which is connected with a valence change of Eu ions.
- リンク情報
- ID情報
-
- DOI : 10.1103/PhysRevB.84.024502
- ISSN : 1098-0121
- eISSN : 1550-235X
- Web of Science ID : WOS:000292384100011