کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1627876 | 1516461 | 2006 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pressure-induced valence change in the rare earth metals: The case of praseodymium
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The rare earth metal praseodymium (Pr) transforms from the d-fcc crystal structure (Pr-III) to α-U one (Pr-IV) at 20âGPa with a large volume collapse (ÎV/V=0.16), which is associated with the valence change of the Pr ion. The two 4f electrons in the Pr ion is supposed to be itinerant in the Pr-IV phase. In order to investigate the electronic state of the phase IV, we performed the high-pressure electrical resistance measurement using the diamond anvil cell up to 32âGPa. In the Pr-IV phase, the temperature dependence of the resistance shows an upward negative curvature, which is similar to the itinerant 5f electron system in actinide metals and compounds. This suggests the narrow quasiparticle band of the 4f electrons near the Fermi energy. A new phase boundary is found at T0 in the Pr-IV phase. From the temperature and magnetic field dependences of the resistance at 26âGPa, the ground state of the Pr-IV phase is suggested to be magnetic. Several possibilities for the origin of T0 are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volumes 408â412, 9 February 2006, Pages 244-247
Journal: Journal of Alloys and Compounds - Volumes 408â412, 9 February 2006, Pages 244-247
نویسندگان
N. Tateiwa, A. Nakagawa, K. Fujio, T. Kawae, K. Takeda,