کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1596449 | 1002825 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Specific heat of (Ca1âxSrx)3Ru2O7 single crystals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We have measured the specific heat of crystals of (Ca1âxSrx)3Ru2O7 using ac- and relaxation-time calorimetry. Special emphasis was placed on the characterization of the Néel (TN=56K) and structural (Tc=48K) phase transitions in the pure, x=0 material. While the latter is believed to be first order, detailed measurements under different experimental conditions suggest that all the latent heat (with Lâ¼0.3R) is being captured in a broadened peak in the effective heat capacity. The specific heat has a mean-field-like step at TN, but its magnitude (ÎcPâ¼R) is too large to be associated with a conventional itinerant electron (e.g. spin-density-wave) antiferromagnetic transition, while its entropy is too small to be associated with the full ordering of localized spins. The TN transition broadens with Sr substitution while its magnitude decreases slowly. On the other hand, the entropy change associated with the Tc transition decreases rapidly with Sr substitution, and is not observable for our x=0.58 sample.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 141, Issue 7, February 2007, Pages 402-406
Journal: Solid State Communications - Volume 141, Issue 7, February 2007, Pages 402-406
نویسندگان
V. Varadarajan, S. Chikara, V. Durairaj, X.N. Lin, G. Cao, J.W. Brill,