Affiliation:
1. Synergetic Extreme Condition High‐Pressure Science Center State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China
2. Asian School of the Environment Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
3. Institute of High Pressure Physics School of Physical Scientific and Technology Ningbo University Ningbo 315211 China
Abstract
AbstractSuperconductivity at room temperature and near‐ambient pressures is a highly sought‐after phenomenon in physics and materials science. A recent study reported the presence of this phenomenon in N‐doped lutetium hydride [Nature 615, 244 (2023)], however, subsequent experimental and theoretical investigations have yielded inconsistent results. This study undertakes a systematic examination of synthesis methods involving high temperatures and pressures, leading to insights into the impact of the reaction path on the products and the construction of a phase diagram for lutetium hydrides. Notably, the high‐pressure phase of face‐centered cubic LuH3 (fcc‐LuH3) is maintained to ambient conditions through a high‐temperature and high‐pressure method. Based on temperature and anharmonic effects corrections, the lattice dynamic calculations demonstrate the stability of fcc‐LuH3 at ambient conditions. However, no superconductivity is observed above 2 K in resistance and magnetization measurements in fcc‐LuH3 at ambient pressure. This work establishes a comprehensive synthesis approach for lutetium hydrides, thereby enhancing the understanding of the high‐temperature and high‐pressure method employed in hydrides with superconductivity deeply.
Funder
National Natural Science Foundation of China
Program for Changjiang Scholars and Innovative Research Team in University
Fundamental Research Funds for the Central Universities