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Strong electron-boson coupling in the iron-based superconductor BaFe1.9Pt0.1As2 revealed by infrared spectroscopy
Zhen Xing, Shanta Saha, J. Paglione +1
Understanding the formation of Cooper pairs in iron-based superconductors is one of the most important topics in condensed matter physics. In conventional superconductors, the elec…
Spontaneously polarized half-gapped superconductivity
Sheng Ran, Chris Eckberg, Qing-Ping Ding +8
Nonunitary superconductivity is a rare and striking phenomenon in which spin up and spin down electrons segregate into two different quantum condensates. Because they support topol…
Imaging emergent heavy Dirac fermions of a topological Kondo insulator
Harris Pirie, Yu Liu, A. Soumyanarayanan +12
Kondo insulators are primary candidates in the search for strongly correlated topological quantum phases, which may host topological order, fractionalization, and non-Abelian stati…
Electrical detection of surface spin polarization of candidate topological Kondo insulator SmB6
Jehyun Kim, Chaun Jang, Xiangfeng Wang +3
The Kondo insulator compound SmB6 has emerged as a strong candidate for the realization of a topologically nontrivial state in a strongly correlated system, a topological Kondo ins…
Intrinsic Insulating Ground State in Transition Metal Dichalcogenide TiSe2
Daniel J. Campbell, Chris Eckberg, Peter Y. Zavalij +8
The transition metal dichalcogenide TiSe has received significant research attention over the past four decades. Different studies have presented ways to suppress the 200~K cha…
Single crystal investigation of proposed type-II Weyl semimetal CeAlGe
H. Hodovanets, C. J. Eckberg, P. Y. Zavalij +6
We present details of materials synthesis, crystal structure, and anisotropic magnetic properties of single crystals of CeAlGe, a proposed type-II Weyl semimetal. Single-crystal x-…
Observation of perfect Andreev reflection due to Klein paradox in a topological superconducting state
Seunghun Lee, Valentin Stanev, Xiaohang Zhang +11
In 1928, P. Dirac proposed a new wave equation to describe relativistic electrons. Shortly afterwards, O. Klein solved a simple potential step problem for the Dirac equation and st…
Mechanical control of crystal symmetry and superconductivity in Weyl semimetal MoTe
Colin Heikes, I-Lin Liu, Tristin Metz +11
The non-centrosymmetric Weyl semimetal candidate, MoTe was investigated through neutron diffraction and transport measurements at pressures up to 1.5 GPa and at temperatures do…
Evolution of Structure and Superconductivity in Ba(NiCo)As
Chris Eckberg, Limin Wang, Halyna Hodovanets +5
The effects of Co-substitution on Ba(NiCo)As () single crystals grown out of Pb flux are investigated via transport, magnetic, and thermodyna…
CoAs: The line of 3d demarcation
Daniel J. Campbell, Limin Wang, Chris Eckberg +3
Transition metal-pnictide compounds have received attention for their tendency to combine magnetism and unconventional superconductivity. Binary CoAs lies on the border of paramagn…
Freezing out of a low-energy bulk spin exciton in SmB6
K. Akintola, A. Pal, S. R. Dunsiger +6
The Kondo insulator SmB6 is purported to develop into a robust topological insulator at low temperature. Yet there are several puzzling and unexplained physical properties of the i…
Unconventional Charge Density Wave Order in the Pnictide Superconductor Ba(NiCo)As
Sangjun Lee, Gilberto de la Pena, Stella X. -L. Sun +10
Ba(NiCo)As is a structural homologue of the pnictide high temperature superconductor, Ba(FeCo)As, in which the Fe atoms are replaced by Ni.…