Specific Heat of (Sr Ca)RuO 3
Specific Heat of (Sr Ca)RuO 3
复制标题
(Sr Ca)RuO 3 的比热
DOI：
10.1143/jpsj.67.307
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发表时间：
1998
影响因子：
1.7
通讯作者：
G. Hilscher
中科院分区：
文献类型：
--
作者：
T. Kiyama;K. Yoshimura;K. Kosuge;H. Michor;G. Hilscher
用绝热热脉冲法测量了（Sr-Ca）RuO 3体系的比热。电子比热系数γ从SrRuO 3的30 mJ/molK 2变化到CaRuO 3的82 mJ/molK 2，最大值为Sr 0.2Ca0.8RuO3的10 0 mJ/molK 2.一个强的上升，在C / T-T2曲线在低温下已观察到顺磁性Sr 0.2 Ca 0.8 RuO 3和CaRuO 3。用巡游电子磁性的自旋涨落理论定量地解释了这一行为，表明该体系可能由中间巡游铁磁体SrRuO 3，经过弱巡游铁磁体，转变为近铁磁性金属CaRuO 3 .
The specific heat of (Sr–Ca)RuO 3 system was measured by an adiabatic method utilizing a heat-pulse technique. The values of electronic specific heat coefficient γ change from 30 mJ/molK 2 for SrRuO 3 to 82 mJ/molK 2 for CaRuO 3 through a maximum value of about 100 mJ/molK 2 for Sr 0.2 Ca 0.8 RuO 3 . A strong upturn in the C / T vs T 2 curve at low temperatures has been observed for paramagnetic Sr 0.2 Ca 0.8 RuO 3 and CaRuO 3 . This behavior is quantitatively explained by the spin-fluctuation theory of the itinerant-electron magnetism, suggesting that this system possibly changes from intermediate itinerant ferromagnet of SrRuO 3 , through weakly itinerant ferromagnet, to nearly ferromagnetic metal of CaRuO 3 .