침공 때문에 묻혀서 다시 올려 봄


이런 논문들과의 차이점은 헷갈릴 만한 물질이 있으니까 

더 정확한 장비로 제로 저항을 측정해야 그걸 제로 저항으로 인정해 줄 수 있다는 주장으로 보면 되는 거?




1. Patel, U., et al. "Growth and superconductivity of FeSex crystals." Applied Physics Letters 94.8 (2009).


https://pubs.aip.org/aip/apl/article-abstract/94/8/082508/337799/Growth-and-superconductivity-of-FeSex-crystals?redirectedFrom=fulltext

 

Growth and superconductivity of FeSex crystalsIron selenide (FeSex) crystals with lateral dimensions up to millimeters were grown via a vapor self-transport method. The crystals consist of the dominant α-phpubs.aip.org


Iron selenide (FeSex) crystals with lateral dimensions up to millimeters were grown via a vapor self-transport method. The crystals consist of the dominant α-phase with trace amounts of β-phase as identified by powder x-ray diffraction. With four-probe resistance measurements, we obtained a zero resistance critical temperature of 7.5 K and a superconducting onset transition temperature of up to 11.8 K in zero magnetic field as well as an anisotropy of 1.5±0.11.5±0.1 for the critical field. Magnetization measurements on individual crystals reveal the coexistence of superconductivity and ferromagnetism.




2. Eremets, M.I., Minkov, V.S., Drozdov, A.P. et al. High-Temperature Superconductivity in Hydrides: Experimental Evidence and Details. J Supercond Nov Magn 35, 965–977 (2022). https://doi.org/10.1007/s10948-****-06148-1


The electrical resistance is typically measured using a four-probe arrangement. This guarantees that the resistance of the electrical leads is excluded from the measurements — only the sample is examined (Fig. 2). The simplest four-probe arrangement for micrometer-size samples clamped between diamond anvils is the van der Pauw geometry [39, 40] (Fig. 2a, b). By alternating the combination of current and voltage contacts, one can measure resistance from different parts of the sample that provides information about its uniformity (Fig. 2c, d). In addition, by passing electrical current through opposite contacts under an applied magnetic field, one can pick up the Hall signal from another pair of contacts [40, 41].


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To conclude, we presented a detailed description of experiments such as the observation of zero resistance that is concomitant with the onset of the pronounced diamagnetic response, as well as the broadening of the resistive transition under external applied fields.