In recent years, the research that uses ionic liquid to have sex of content of electric field adjusting control as dielectric caused the great attention that condenses voice physics domain, among them the tool of electric field adjusting control that dynatron of charge double deck made a kind of typical case. Through changing the direction of grid voltage and size, of corresponding type carry stream child can gather in the sample surface of ply of accept rice class, change the physical property near sample surface then. Accordingly, have clean and the object that the layer shape compound of level off surface often is this kind of research. But, the most important characteristic that this kind of electric field causes content sex is, once grid voltage is released below the liquid condition of dielectric, the sex of bureau region content with revulsive double deck of this kind of charge will disappear quickly, restricted thereby more thorough to causing content sex to undertake study with more comprehensive mechanism.
Recently, institute of physics of the Chinese Academy of Sciences / tall silent of Zhang Shuai of deputy researcher of group of SC10 of key laboratory of state of superconduction of research center of state of physics of Beijing agglomeration condition and doctoral student, wang Xinmin, master couplet earths up unripe Fu Huanyan to be below the guidance of Chen Genfu of task group leader's researcher, in layer shape nitrideMNCl (M: Hf, the electric field adjusting control of Zr) obtains significant progress in research, realized the sex of permanent and superconductive report with revulsive electric field, made be mixinged in the round study deep to its mechanism. Room meets the partial Cl ion that electric field causes produce electronic adulteration to the system, form not reversible stable state superconduction finally to transform. This is explored to be in the low dimension compound that has similar structure and studied superconductive report sex to offer new experimental thinking and view.
Zhang Shuai's deputy researcher and students devised method of a kind of electric field adjusting control that operates easily jointly, it is the layer shape nitride of dielectric to the mother's body with this methodMNCl (M: Hf, zr) had test of detailed electric field adjusting control. Consider to discover, in inferior temperature (when 220 K) has electric field adjusting control, along with the resistor that temperature changesRRT) in observe the dielectric with revulsive electric field - superconductive change, TC is in 24 with 15 K around. In bring to bear on retrorse grid voltage is long perhaps after pleasedding without voltage relax, RRT) the dielectric position that can restore to be like with photograph of the mother's body again, this and condition of traditional superconduction of charge double deck are consistent. As opposite as this, in higher temperature (when 250 K) has electric field adjusting control, the superconductive condition that cause is destroyed for long perhaps without place of voltage relax comfort by retrorse grid voltage no longer, and stay permanently in sample interior. Be in with the single crystal sample that will check R(T) subsequently magneticMMT) the diamagnetism signal that in measuring, also affirmed in corresponding temperature superconductive condition is caused, proved this exceeds the permanent attribute of conductivity directly. Method of same electric field adjusting control is succeeded to popularize the single crystal of large size and much brilliant sample.
In groovy electric field adjusting control, the ionic effect interposing a layer that electric field causes is in bring to bear on contrary result can appear when the grid voltage of opposite way. Accordingly, RRT) in not reversible dielectric - the possibility that superconductive change had eliminated electric field to cause ion to interpose a layer. Identical grid voltage arose below different temperature reversible and cannot go against two kinds of disparate test results, alluded the main effect when temperature is using ionic liquid to have electric field adjusting control. Window of ionic liquid electrochemistry is as temperature lift and reduce. In higher temperature (250 K) brings to bear on the chemical reaction that generation of surface of can revulsive sample cannot go against the grid voltage that is close to window of ionic liquid electrochemistry. Combine the sex of permanent and superconductive report that observes in the experiment, the dielectric that we think that we cannot be gone against - superconductive change comes from what cause room of partial Cl ion at electric field adjusting control to form, bring about the permanent electronic infuse to the system thereby. Similar dielectric - metallic change phenomenon once covered somewhat in the research of VO2.
Stable and abiding superconductive condition was more elaborate content sex test to offer research target. The electric field effect that discovers in this job and electrochemistry mechanism, overcame a few limitation of dynatron of traditional charge double deck, extended the function that has sex of content of electric field adjusting control through ionic liquid, in the exploration in material of likeness low dimension new-style superconductor respect showed tremendous potential.
Afore-mentioned research are published in Chin as Express Letter as a result. Phys. Lett. 35 097401(2018) . This research work received national science fund (research and development of emphasis of 11704403) , nation plans (2016YFA0401000, b of 2016YFA0300604) , Chinese Academy of Sciences kind forerunner (the support of the project such as XDB07020100) .
Graph 1. The sample of chunk body single crystal that uses in the experiment and the plant of electric field adjusting control that design independently.
Graph 2. The comparative test of electric field adjusting control has in 220K and 250 K.
Graph 3. The notional model that undertakes in 220K and 250 K adjusting control of electric field of positive and negative and Cl ionic room are formed.
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