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47511208木蟲 (小有名氣)
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[求助]
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| The magnetic and magnetotransport properties of SrRuO3 epitaxial thin films grown on (001)-oriented SrTiO3 substrates by dc magnetron sputtering were studied in detail. The analysis of the electric transport data suggests a crossover from Fermi-liquid to non-Fermi-liquid behavior at similar to 50 K. Apart from this, a low-temperature upturn in the resistivity of the film is observed which is possibly associated with disorder-induced localization effects. Interestingly, the rho(T) in the paramagnetic state follows a T-1/2 dependence. This behavior is similar to that observed in bulk SRO single-crystals. Most strikingly, the temperature-dependent magnetoresistance exhibits two distinct dips (one around ferromagnetic ordering temperature and the other around 40 K), resembling a double-well potential in appearance. Concerning the magnetic behavior of the films, it is found that the low-temperature magnetization diminishes with increasing temperature due, probably, to thermally excited magnons as well as Stoner excitations. In turn, the magnetization near T-c follows the scaling law, M infinity(T-c - T)(alpha), with alpha approximate to 0.39. The magnitude of alpha seems to be consistent with three-dimensional (3D) Ising-type ferromagnetic behavior. (C) 2012 Elsevier Ltd. All rights reserved |
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half好胖子
金蟲 (正式寫手)
雷鋒
- 應(yīng)助: 24 (小學(xué)生)
- 金幣: 1351.7
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- 帖子: 555
- 在線: 60.6小時(shí)
- 蟲號(hào): 2573320
- 注冊(cè): 2013-07-30
- 性別: GG
- 專業(yè): 藥物化學(xué)
【答案】應(yīng)助回帖
感謝參與，應(yīng)助指數(shù) +1
| SrRuO3外延薄膜的磁性和磁輸運(yùn)性質(zhì)（001）通過直流磁控濺射型SrTiO3襯底上進(jìn)行了詳細(xì)的研究。電動(dòng)交通工具的數(shù)據(jù)分析表明，交叉的費(fèi)米液體的非費(fèi)米液體行為類似于50 K。除此之外，在膜的電阻率的低溫復(fù)蘇是觀察這可能與疾病引起的定位效應(yīng)。有趣的是，Rho（T）在順磁狀態(tài)如下的T1 / 2的依賴。這種行為是類似于散裝SRO單晶中觀察到的。最引人注目的是，依賴于溫度的電阻表現(xiàn)出兩種不同的傾角（一個(gè)在鐵磁有序溫度和其他約40 K），類似于雙勢(shì)阱的外觀。對(duì)薄膜的磁行為，發(fā)現(xiàn)低溫磁化強(qiáng)度隨溫度的升高而減少，可能，熱激發(fā)的磁振子以及斯托納激發(fā)。反過來，在T-C磁化如下的標(biāo)度律，M無窮大（T-C - T）（α），α近似為0.39。α的大小似乎是一致的三維（3D）型伊辛鐵磁行為。（C）2012 Elsevier公司保留所有權(quán) |
2樓2014-02-26 10:12:34
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