Pressure and magnetic field dependence of valence and magnetic transitions in EuPtP

Akihiro Mitsuda, T. Okuma, K. Sato, K. Suga, Y. Narumi, K. Kindo, Hirofumi Wada

Research output: Contribution to journalArticle

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Abstract

The hexagonal layered compound, EuPtP, exhibits two valence transitions, at T1 = 235K and T2 = 190K, and an antiferromagnetic order at TN = 8.6K. We have examined the effects of magnetic field and pressure, and the specific heat. Analysis of the high-field experiments confirms that half of Eu are in a divalent state at the lowest temperature, and that the number of Eu2 + increases discontinuously at T2 and T1 with increasing temperature. The magnetic entropy reaches ∼ 22JK- 1mol- 1 at room temperature, which is larger than that expected for J = 7/2 of Eu2 + (17.3 JK- 1mol - 1). This is in good agreement with the magnetic entropy deduced from the interconfigurational fluctuation model, which explains the valence transition in Eu(Pd1 - xPtx)2Si2. The application of pressure shifts T1 and T2 higher and suppresses the intermediate phase (β phase, T2 < T < T1), whereas it does not change the properties of the low-temperature phase (γ phase, T < T2) and the TN.

Original languageEnglish
Article number226003
JournalJournal of Physics Condensed Matter
Volume22
Issue number22
DOIs
Publication statusPublished - May 21 2010

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pressure distribution
entropy
Magnetic fields
valence
magnetic fields
Entropy
specific heat
Temperature
shift
room temperature
Specific heat
temperature
Experiments

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Pressure and magnetic field dependence of valence and magnetic transitions in EuPtP. / Mitsuda, Akihiro; Okuma, T.; Sato, K.; Suga, K.; Narumi, Y.; Kindo, K.; Wada, Hirofumi.

In: Journal of Physics Condensed Matter, Vol. 22, No. 22, 226003, 21.05.2010.

Research output: Contribution to journalArticle

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AU - Okuma, T.

AU - Sato, K.

AU - Suga, K.

AU - Narumi, Y.

AU - Kindo, K.

AU - Wada, Hirofumi

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N2 - The hexagonal layered compound, EuPtP, exhibits two valence transitions, at T1 = 235K and T2 = 190K, and an antiferromagnetic order at TN = 8.6K. We have examined the effects of magnetic field and pressure, and the specific heat. Analysis of the high-field experiments confirms that half of Eu are in a divalent state at the lowest temperature, and that the number of Eu2 + increases discontinuously at T2 and T1 with increasing temperature. The magnetic entropy reaches ∼ 22JK- 1mol- 1 at room temperature, which is larger than that expected for J = 7/2 of Eu2 + (17.3 JK- 1mol - 1). This is in good agreement with the magnetic entropy deduced from the interconfigurational fluctuation model, which explains the valence transition in Eu(Pd1 - xPtx)2Si2. The application of pressure shifts T1 and T2 higher and suppresses the intermediate phase (β phase, T2 < T < T1), whereas it does not change the properties of the low-temperature phase (γ phase, T < T2) and the TN.

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