Thermodynamic properties and enhancement of diamagnetism in nitrogen doped lutetium hydride synthesized at high pressure.

التفاصيل البيبلوغرافية
العنوان:	Thermodynamic properties and enhancement of diamagnetism in nitrogen doped lutetium hydride synthesized at high pressure.
المؤلفون:	Yifeng Han, Yunbo Ou, Hualei Sun, Jan Jan, Leonel, Gerson J., Xin Guo, Brugman, Benjamin L., Leinenweber, Kurt, Hongwu Xu, Meng Wang, Tongay, Sefaattin, Navrotsky, Alexandra
المصدر:	Proceedings of the National Academy of Sciences of the United States of America; 3/19/2024, Vol. 121 Issue 12, p1-6, 2072p
مصطلحات موضوعية:	THERMODYNAMICS, HIGH temperature superconductivity, DIAMAGNETISM, LUTETIUM, HEAT of formation, MELT spinning
مستخلص:	Nitrogen doped lutetium hydride has drawn global attention in the pursuit of room-temperature superconductivity near ambient pressure and temperature. However, variable synthesis techniques and uncertainty surrounding nitrogen concentration have contributed to extensive debate within the scientific community about this material and its properties. We used a solid-state approach to synthesize nitrogen doped lutetium hydride at high pressure and temperature (HPT) and analyzed the residual starting materials to determine its nitrogen content. High temperature oxide melt solution calorimetry determined the formation enthalpy of LuH1.96N0.02 (LHN) from LuH2 and LuN to be -28.4 ± 11.4 kJ/mol. Magnetic measurements indicated diamagnetism which increased with nitrogen content. Ambient pressure conductivity measurements observed metallic behavior from 5 to 350 K, and the constant and parabolic magnetoresistance changed with increasing temperature. High pressure conductivity measurements revealed that LHN does not exhibit superconductivity up to 26.6 GPa. We compressed LHN in a diamond anvil cell to 13.7 GPa and measured the Raman signal at each step, with no evidence of any phase transition. Despite the absence of superconductivity, a color change from blue to purple to red was observed with increasing pressure. Thus, our findings confirm the thermodynamic stability of LHN, do not support superconductivity, and provide insights into the origins of its diamagnetism. [ABSTRACT FROM AUTHOR]
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قاعدة البيانات:	Complementary Index

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