Tunable Superconductivity in Phosphorus‐Doped Topological Transition‐Metal Germanide Mo5Ge3. Issue 12 (26th October 2022)

• Record Type: Journal Article
• Authors: Xiao, Guorui; Ji, Liangwen; Yang, Wuzhang; Zhu, Qinqing; Song, Shijie; Cao, Guang‐Han; Ren, Zhi
• Is Part Of: Advanced quantum technologies. Volume 5:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-26
• Subjects: enhancement of superconductivity -- nodal line semimetal -- phosphorus doping -- rigid band shift -- transition metal germanide; Quantum theory -- Periodicals; Quantum computing -- Periodicals; Quantum chemistry -- Periodicals; Quantum electronics -- Periodicals; 537.5
• DOI: 10.1002/qute.202200097
• Languages: English
• ISSNs: 2511-9044

Abstract

Abstract: The effect of phosphorus doping in the transition metal germanide Mo5 Ge3, which is predicted to be a nodal line semimetal and exhibits superconductivity below T c = 0.75 K, is studied. It is found that Mo5 Ge 3 − x $_{3-x}$ P x retains the tetragonal W5 Si3 ‐type structure up to x = 1.0, and the incorporation of phosphorus leads to a shrinkage of the unit cell volume. Remarkably, T c of Mo5 Ge 3 − x $_{3-x}$ P x is enhanced by more than one order of magnitude with increasing x, reaching 8.24 K at x = 1.0. This enhancement is attributed to the increases in both the density of states at the Fermi level and electron–phonon coupling strength. Theoretical calculations show that the phosphorus doping leads to a nearly rigid‐band shift of the Fermi level into a local maximum of the density of states. This study unveils that transition metal germanides offer an emerging platform to study the interplay between superconductivity and nontrivial band topology. Abstract : Phosphorus doping in the nodal line semimetal Mo5 Ge3 induces a strong enhancement of its T c from 0.75 to 8.24 K. This enhancement is attributed to the increases in both the Sommerfeld coefficient and electron–phonon coupling strength, resulting from to a nearly rigid‐band shift of the Fermi level into a local maximum of the density of states.