Electron-Hole Competition and Structural Response in the Two-Band Superconductor Nb<sub>2</sub>Pd<sub>x</sub>Se<sub>5</sub>
ORAL
Abstract
The superconducting properties of Nb2PdxSe5 are highly dependent on the Pd stoichiometry. We have synthesized single crystals of Nb2PdxSe5 with x in the range of 0.68 to 0.96 and have carried out detailed single crystal x-ray structural studies. We observe a pivotal shift in the atomic positions that depend on palladium occupancy at the threshold for superconductivity. We will discuss the crystal growth process, our recent findings of the subtle but profound structural changes, and present the rich spectrum of electronic behavior observed for different Pd occupancy regions. At the threshold Pd stoichiometry for superconductivity, a miscibility gap is apparent, with commensurate change in the electronic transport properties. Electron-hole competition in this two-band system is thought to be responsible for this behavior.
*Work at the Univ. of Missouri was supported by the U.S. DOE, Ofc. of Sci., Ofc. of Basic Energy Sci., DE-SC0019114. KW acknowledges support from the NHMFL through the Jack Crow Postdoctoral Fellowship. AG and TEAS acknowledge support from the U.S. DOE, Heavy Elements Chem. Program, DE-FG02-13ER16414. Part of the work was carried out at the NHMFL, supported by the NSF, NSF/DMR-1644779 and the State of FL. JN and TS acknowledge support from the NSF, NSF/DMR-1606952.
–
Presenters
-
Jennifer Neu
- National High Magnetic Field Laboratory
- Florida State Univ
- Natl High Magnetic Field Lab
- National High Magnetic Field Laboratory, Florida State University