Browsing by Author "Ghassemi, Nader"

Now showing items 1-5 of 5

    • Charge-carrier behavior in Ba-, Sr- and Yb-filled CoSb3: NMR and transport studies 
      Tian, Yefan; Sirusi, Ali A.; Ballikaya, Sedat; Ghassemi, Nader; Uher, Ctirad; Ross, Joseph H. Jr. (2019)
      We report 59Co NMR and transport measurements on n-type filled skutterudites BaxYbyCo4Sb12 and AxCo4Sb12 (A=Ba or Sr), promising thermoelectric materials. The results demonstrate consistently that a shallow defect level ...
    • Dirac electron behavior and NMR evidence for topological band inversion in ZrTe5 
      Tian, Yefan; Ghassemi, Nader; Ross, Joseph H. Jr. (2019)
      We report 125Te NMR measurements of the topological quantum material ZrTe5. Spin-lattice relaxation results, well explained by a theoretical model of Dirac electron systems, reveal that the topological characteristic of ...
    • Gap-opening transition in Dirac semimetal ZrTe5 
      Tian, Yefan; Ghassemi, Nader; Ross, Joseph H. Jr. (2021)
      We apply 125Te nuclear magnetic resonance (NMR) spectroscopy to investigate the Dirac semimetal ZrTe5. With the NMR magnetic field parallel to the b axis, we observe significant quantum magnetic effects. These include an ...
    • NMR and DFT Study of Tetrahedrite Thermoelectric Compounds 
      Ghassemi, Nader (2020-08-27)
      Thermoelectric (TE) materials offer interconversion of thermal and electrical energy through the presence of a heat gradient and thus constitute an attractive option for the recovery of waste heat. Low conversion efficiency ...
    • Topological Nodal Line in ZrTe2 Demonstrated by Nuclear Magnetic Resonance 
      Tian, Yefan; Ghassemi, Nader; Ross, Joseph H. Jr. (2020)
      In this work, we report nuclear magnetic resonance (NMR) combined with density functional theory studies of the transition metal dichalcogenide ZrTe2. The measured NMR shift anisotropy reveals a quasi-two-dimensional ...