We are proud to announce that Dr. Hsiang-Hsi (Sean) Kung has been awarded the 2018 Richard J. Plano Dissertation Prize. This Prize is awarded to the graduate student with the best Ph.D. dissertation this academic year. For more information please see here. Also congratulations to undergraduate student Viktor Krapivin for receiving the Richard T. Weidner …
Authors: W.-L.Zhang, W.R.Meier, T.Kong, P.C.Canfield and G. Blumberg Abstract: The B2g symmetry Raman response shows no signatures of Pomeranchuk-like electronic nematic fluctuations which is observed for many other Fe-based superconductors. In the superconducting state, we identify three pair-breaking peaks at 13.8, 16.9 and 21 meV and full spectral weight suppression at low energies. The pair-breaking …
High Tc superconductivity in CaKFe4As4 in absence of nematic fluctuations Read More »
Shangfei Wu gives his thesis defense and earns his doctoral degree after the successful presentation! Congratulations to our new Dr. Wu!
Authors: S.-F. Wu, W.-L. Zhang, L. Li, H. B. Cao, H.-H. Kung, A. S. Sefat, H. Ding, P. Richard, and G. Blumberg Abstract: We employ polarization-resolved Raman spectroscopy to study critical nematic fluctuations in Ba(Fe1-xAux)2As2 superconductors above and across well separated tetragonal to orthorhombic phase transition at temperature TS(x) and the Neel transition at TN(x). The static …
On the origin of critical nematic fluctuations in pnictide superconductors Read More »
Authors: S.-F. Wu, W.-L. Zhang, L. Li, H.-B. Cao, H.-H. Kung, A. S. Sefat, H. Ding, P. Richard, and G. Blumberg Abstract: We used polarization-resolved Raman scattering to study magneto-elastic coupling in Ba(Fe1-xAux)2As2 crystals as a function of light Au-doping, materials for which temperatures of the structural transition (TS) and of the magnetic ordering transition (TN) …
Anomalous magneto-elastic coupling in Au-doped BaFe2As2 Read More »
Authors: S.-F. Wu, W.-L. Zhang, V. K. Thorsmølle, G. F. Chen, G. T. Tan, P. C. Dai, Y. G. Shi, C. Q. Jin, T. Shibauchi, S. Kasahara, Y. Matsuda, A. S. Sefat, H. Ding, P. Richard, and G. Blumberg Abstract: We used polarization-resolved Raman scattering to study the magneto-elastic coupling in the parent compounds of several …
Magneto-elastic coupling in Fe-based superconductors Read More »
Authors: W.-L. Zhang, S.-F. Wu, S. Kasahara, T. Shibauchi, Y. Matsuda, and G. Blumberg Abstract: We use polarization-resolved electronic Raman spectroscopy to study charge dynamics in non-magnetic FeSe1-xSx superconductor. We observe two features of the XY quadrupole symmetry: a low-energy quasi-elastic peak (QEP) and an electronic continuum extending to high energy. The QEP exhibits critical enhancement …
Stripe quadrupole order in the nematic phase of FeSe1−xSx Read More »
Our new paper “Chiral Spin Mode on the Surface of a Topological Insulator” has been Highlighted by Rutgers Today, and also covered by several News Outlets: EurekAlert! Phys.Org Science Daily Nanowerk Newswise Health Medicinet Long Room Jersey Tribune New Brunswick Patch Futurity (continuing…)
Authors: H.-H. Kung, S. Maiti, X. Wang, S.-W. Cheong, D.L. Maslov, G. Blumberg Abstract: Using polarization-resolved resonant Raman spectroscopy, we explore collective spin excitations of the chiral surface states in a three dimensional topological insulator, Bi2Se3. We observe a sharp peak at 150 meV in the pseudovector A2 symmetry channel of the Raman spectra. By …
New paper published – Chiral Spin Mode on the Surface of a Topological Insulator Read More »
Our manuscript ‘Surface vibrational modes of the topological insulator Bi2Se3 observed by Raman spectroscopy’ is published online in Phys. Rev. B 95, 245406 (2017) (link; PDF), see more details here.
