本文選題：高壓調(diào)控　切入點：磁性量子臨界點　出處：《物理學報》2017年03期 　論文類型：期刊論文

【摘要】：通過化學摻雜或者施加高壓等調(diào)控手段抑制長程磁有序可以實現(xiàn)磁性量子臨界點,在其附近往往伴隨出現(xiàn)諸如非費米液體行為或者非常規(guī)超導電性等奇特物理現(xiàn)象.相比于化學摻雜,高壓調(diào)控具有不引入晶格無序和精細調(diào)控等優(yōu)點.利用能提供良好靜水壓環(huán)境的立方六面砧和活塞-圓筒高壓低溫測量裝置,首先系統(tǒng)研究了具有雙螺旋磁有序結(jié)構(gòu)的CrAs和MnP單晶的高壓電輸運行為,分別在P_c≈0.8 GPa和8 GPa實現(xiàn)了它們的磁性量子臨界點,并在P_c附近分別觀察到T_c=2 K和1 K的超導電性,相繼實現(xiàn)了鉻基和錳基化合物超導體零的突破;然后,詳細測量了FeSe單晶高壓下的電阻率和交流磁化率,繪制了詳盡的溫度-壓力相圖,揭示了電子向列序、長程反鐵磁序和超導相之間的相互競爭關系,特別是在接近磁有序消失的臨界點P_c≈6GPa附近觀察到T_c~(max)=38.5K的高溫超導電性,表明臨界反鐵磁漲落對FeSe中的高溫超導電性起重要作用.
[Abstract]:Inhibition of long-range magnetic order can be achieved by applying high magnetic quantum critical point control by means of chemical doping or in its vicinity, often accompanied by problems such as non Fermi liquid behavior or unconventional superconductivity and other strange phenomena. Compared with chemical doping, pressure regulation has the advantages of no introduction of lattice disorder and fine regulation. The use of energy provide high static pressure environment six cubic anvil surface and piston cylinder of high pressure low temperature measuring device, first studied electric magnetic ordering with double spiral structure of CrAs and the transport behavior of MnP single crystal, the magnetic quantum critical point are realized in the P_c = 0.8 GPa and 8 GPa, and in the vicinity of P_c respectively. The observed T_c=2 K and 1 K superconductivity, have realized the chromium matrix and manganese oxide superconductor zero breakthrough; then, FeSe single crystal under high pressure resistivity and AC susceptibility measurement with Detailed, temperature pressure diagrams, reveals the electronic nematic order, long-range antiferromagnetic order and superconducting phase between the competition, especially in the vicinity of the critical point to observe the magnetic ordering is 6GPa to T_c~ the disappearance of the P_c (max) =38.5K high temperature superconductivity, that critical antiferromagnetic the fluctuations of the important role of high temperature superconductivity in FeSe.

【作者單位】： 中國科學院物理研究所 極端條件物理重點實驗室;
【基金】：國家自然科學基金(批準號:11574377) 國家重點基礎研究發(fā)展計劃(批準號:2014CB921500) 中國科學院先導B項目(批準號:XDB07020100)資助的課題~~
【分類號】：O521.2

【相似文獻】

相關期刊論文 前4條

1 劉技文,劉文西,耿殿禹;快淬NdFe_(11)TiC_x合金退火過程中磁有序結(jié)構(gòu)的轉(zhuǎn)變[J];天津大學學報;2001年02期

2 岳中岳;金鉆明;周潤澤;馬國宏;;磁有序結(jié)構(gòu)的太赫茲光譜——自旋極化的THz波激發(fā)、色散和相干控制[J];自然雜志;2013年05期

3 李林;朱林;成泰民;史話靜;;La_(1-x)Ca_xMnO_3的電子結(jié)構(gòu)與磁有序研究[J];東北大學學報(自然科學版);2008年03期

4 ;[J];;年期

相關博士學位論文 前1條

1 張焱;鐵基超導體中磁有序以及超導配對對稱性的角分辨光電子能譜研究[D];復旦大學;2012年

，

本文編號：1638730