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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.

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Presenters

  • Jennifer Neu

    National High Magnetic Field Laboratory, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University

Authors

  • Jennifer Neu

    National High Magnetic Field Laboratory, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University

  • David E Graf

    Florida State University, National High Magnetic Field Laboratory, Florida State University, Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Lab, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory-Florida State University, National High Magnetic Field Laboratory, Tallahassee, FL, NHMFL, Florida State University, NHMFL

  • Kaya Wei

    Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA.

  • Alyssa Gaiser

    Chemistry and Biochemistry, Florida State Univ.

  • Yan Xin

    National High Magnetic Field Laboratory, Natl High Magnetic Field Lab

  • Thomas Albrecht-Schmitt

    Chemistry and Biochemistry, Florida State Univ.

  • Ryan Baumbach

    National High Magnetic Field Laboratory/Florida State University, MagLab Tallahassee, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University, Physics, NHMFL, Florida State University

  • David J Singh

    Physics, Univ. of Missouri

  • Theo Siegrist

    Florida State Univ, National High Magnetic Field Laboratory, Natl High Magnetic Field Lab, Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA.; Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering,