Earticle

초록

영어

Recently, a claim of material, named LK-99 (a lead apatite-based compound), exhibiting a superconducting transition temperature of over 400 K under standard atmospheric pressure, was reported [1, 2]. This claim has generated considerable attention from scientists worldwide. Here, we synthesized five LK-99 samples following the method detailed in the original papers [1, 2], and measured structural and resistivity data for each of these samples. The structure of the synthesized samples (P63/m, a=9.82 Å , c=7.34 Å ) was very close to the reported one. Contrary to the report, however, no hint of room-temperature superconductivity was noted from any of the samples. The results of Energy-dispersive X-ray spectroscopy (EDXS) measurements demonstrate that the atomic distribution in the sample was inhomogenous, and unreacted precursors were included in the samples. To investigate the intrinsic superconducting properties of LK-99, we propose to synthesize samples having high structural purity and chemical uniformity.

목차

Abstract
1. INTRODUCTION
2. SAMPLE PREPARATION
2.1. 라나카이트 (Lanarkite), Pb2SO5 합성
2.2. 구리인화물 (Copper Phosphide), Cu3P 합성
2.3. LK-99 합성
3. RESULTS AND DISCUSSION
3.1. 구조 측정 결과
3.2. 전기저항 측정 결과
4. CONCLUSION
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• Soo Min Park [ Hanyang University, Seoul, 04763, Republic of Korea ]
• L. Sun [ Hanyang University, Seoul, 04763, Republic of Korea ]
• T. Wu [ Hanyang University, Seoul, 04763, Republic of Korea ]
• Jongho Park [ Seoul National University, Seoul, 08826, Republic of Korea ]
• Changyong Kim [ Seoul National University, Seoul, 08826, Republic of Korea ]
• Jaeyong Kim [ Hanyang University, Seoul, 04763, Republic of Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2025

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537