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 language | English |
|---|---|
| Article number | 226003 |
| Journal | Journal of Physics Condensed Matter |
| Volume | 22 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - May 21 2010 |
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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 journal › Article
}
TY - JOUR
T1 - Pressure and magnetic field dependence of valence and magnetic transitions in EuPtP
AU - Mitsuda, Akihiro
AU - Okuma, T.
AU - Sato, K.
AU - Suga, K.
AU - Narumi, Y.
AU - Kindo, K.
AU - Wada, Hirofumi
PY - 2010/5/21
Y1 - 2010/5/21
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.
AB - 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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U2 - 10.1088/0953-8984/22/22/226003
DO - 10.1088/0953-8984/22/22/226003
M3 - Article
C2 - 21393754
AN - SCOPUS:77952336615
VL - 22
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 22
M1 - 226003
ER -