[논문]상온상압 초전도체(LK-99) 개발을 위한 고찰

이석배; 김지훈; 임성연; 안수민; 권영완; 오근호

doi:10.6111/jkcgct.2023.33.2.061

상온상압 초전도체(LK-99) 개발을 위한 고찰
Consideration for the development of room-temperature ambient-pressure superconductor (LK-99) 원문보기

한국결정성장학회지 = Journal of the Korean crystal growth and crystal technology, v.33 no.2, 2023년, pp.61 - 70

이석배 ((주)퀀텀에너지연구소) , 김지훈 ((주)퀀텀에너지연구소) , 임성연 ((주)퀀텀에너지연구소) , 안수민 ((주)퀀텀에너지연구소) , 권영완 (고려대학교 KU-KIST 융합대학원) , 오근호 ((주)퀀텀에너지연구소)

초록
AI-Helper

이 논문에서는 기존의 초전도 현상을 바라보는 물리학자들의 생각의 흐름과 한계들을 살펴보고, 통계 열역학적 액체론의 관점에서 제시한 이론적 배경을 통해 상온 상압 초전도체가 개발될 수 있음을 약술하였다. 이것이 가능 할 방안은, 전자들이 돌아다닐 수 있는 상태수가 현저히 제한되는 1-Dimension에 가까운 전자 상태이어야 한다는 것과 그 상태에 있는 전자들이 액체적 특성이 나타날 수 있을 정도로 전자-전자 상호작용이 빈번한 상태이어야 한다는 것이다. 이러한 실행 예로서 우연한 기회에 실마리를 얻어 수많은 실험으로 구조를 밝혀낸 LK-99(본 연구에서 개발한 상온 상압 초전도체의 이름)의 개발 자료를 보고하며, 이에 세계 최초로 상압에서 임계온도가 97℃를 능가하는 초전도 물질의 특성과 발견에 대한 이론적, 실험적 근거를 요약하였다.

Abstract ▼ AI-Helper

This paper examines the way of thinking and limitations of physicists regarding the phenomenon of superconductivity and outlines how room-temperature and ambient-pressure superconductors can be developed through the statistical thermodynamic background of the liquid state theory. In hypothesis, the number of electron states should be limited by confining them to a state close to one-Dimension. Simultaneously, the electron-electron interactions should be frequent enough for the electrons to have liquid-like properties. As an example of implementing the hypothesis, our team reports the development of room-temperature and ambient-pressure superconductivity of a material named LK-99 (superconducting compound name developed in the research), whose structure was revealed through numerous experiments with a clue found by chance. Moreover, we summarize the theoretical and experimental basis for the characteristics and discovery of the world's first superconducting material surpassing the critical temperature of 97℃ at atmospheric pressure.

주제어

표/그림 (9)

그림 Fig. 1. Schematic (a) metallic and (b) superconducting energy diagram.
그림 Fig. 2. Heat capacity λ-transition near critical point (a) Isochoric heat capacity (C_v) of Ar (b) Isobaric heat capacity (C_p) of ⁴He.
그림 Fig. 3. Abnormal magnetic hysteresis behavior under Zero-Field-Cooling and Field-Cooling. (a) Transition temperature is about 323 K (50ºC) (b), (c) Reproducibility results of same experiment procedure.
그림 Fig. 4. Molecular unit cell structure of LK-99 (a) projection view from c-axis (b) double unit cell following c-axis.
그림 Fig. 5. Zero resistivity measurement of thin film sample (a) measurement window picture at R0 experiment (Keithley 6221 & 2182A) (b) uploaded thin film on copper plate in probe station (MSTech) (c) Measured data of LK-99 thin film (under ± 3 × 10^-8 V) Zoom in data of yellow box.
그림 Fig. 6. LK-99 Ingot sample results of 4-probe measurement for Transition temperature (T_c) following applied Currents (a) ± 30 mA (from patent: 10-2021-0112104) (b) ± 50, ± 60, ± 70 mA, respectively. (c) Current-voltage measurement results following temperature variation (T) (Keithley 228A, 182, 2000).
그림 Fig. 7. Current-voltage measurement results following external magnetic field (H) variation (Keithley 228A, 182, 2000).
그림 Fig. 8. Hysteresis results through zero field cooling and field cooling of LK-99.
그림 Fig. 9. Calculated specific heat capacity over Temperature (C_p/T) of LK-99 at ± 60 mA current near Tc. It shows the characteristic form of λ-transition near T_c.

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Named LK-99 after the initials of the family name (Lee and Kim) of the two people who first discovered a substance with a critical temperature of over 320 K and continued research on it with the last two digits of the year of discovery (1999).？
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