196 citations · 1.5k across the 19 of their papers we have counts for
20 papers
Deep Bayesian Local Crystallography
Sergei V. Kalinin, Mark P. Oxley, Mani Valleti +7
The advent of high-resolution electron and scanning probe microscopy imaging has opened the floodgates for acquiring atomically resolved images of bulk materials, 2D materials, and…
Two-orbital degeneracy lifted state as a local precursor to a metal-insulator transition
Long Yang, Robert J. Koch, Hong Zheng +5
The recent discovery of a local fluctuating t2g orbital-degeneracy-lifted (ODL) state in CuIr2S4 as a high temperature precursor to the metal-insulator transition (MIT) opens the d…
Synthesis and characterization of bulk Nd1-xSrxNiO2 and Nd1-xSrxNiO3
Bi-Xia Wang, Hong Zheng, E. Krivyakina +8
The recent reports of superconductivity in Nd1-xSrxNiO2/SrTiO3 heterostructures have reinvigorated interest in potential superconductivity of low-valence nickelates. Synthesis of N…
Intertwined density waves in a metallic nickelate
J. Zhang, D. Phelan, A. S. Botana +10
Nickelates are a rich class of materials, ranging from insulating magnets to superconductors. But for stoichiometric materials, insulating behavior is the norm, as for most late tr…
High pO2 Floating Zone Crystal Growth of the Perovskite Nickelate PrNiO3
Hong Zheng, Junjie Zhang, Bixia Wang +7
Single crystals of PrNiO3 were grown under an oxygen pressure of 295 bar using a unique high-pressure optical-image floating zone furnace. The crystals, with volume in excess of 1…
High oxygen pressure floating zone growth and crystal structure of the layered nickelates RNiO (R=La, Pr)
Junjie Zhang, Hong Zheng, Yu-Sheng Chen +4
Single crystals of the metallic Ruddlesden-Popper trilayer nickelates RNiO (R=La, Pr) were successfully grown using an optical-image floating zone furnace under oxyg…
Spin stripe order in a square planar trilayer nickelate
Junjie Zhang, D. M. Pajerowski, A. S. Botana +12
Trilayer nickelates, which exhibit a high degree of orbital polarization combined with an electron count (d8.67) corresponding to overdoped cuprates, have been identified as a prom…
Long range antiferromagnetic order in a rocksalt high entropy oxide
Junjie Zhang, Jiaqiang Yan, S. Calder +10
We report for the first time the magnetic structure of the high entropy oxide using neutron powder diffraction. This material exhibits…
Mimicking cuprates: large orbital polarization in a metallic square-planar nickelate
Junjie Zhang, A. S. Botana, J. W. Freeland +5
High temperature cuprate superconductivity remains a defining problem in condensed matter physics. Among myriad approaches to addressing this problem has been the study of alternat…
High pressure floating-zone growth of perovskite nickelate LaNiO3 single crystals
Junjie Zhang, Hong Zheng, Yang Ren +1
We report the first single crystal growth of the correlated metal LaNiO3 using a high-pressure optical-image floating zone furnace. The crystals were studied using single crystal/p…
Stacked Charge Stripes in Quasi-Two_Dimensional Trilayer Nickelate La4Ni3O8
Junjie Zhang, Yu-Sheng Chen, D. Phelan +3
The quasi-two-dimensional nickelate La4Ni3O8 (La-438) is an anion deficient n=3 Ruddlesden-Popper (R-P) phase that consists of trilayer networks of square planar Ni ions, formally…
Evidence of photo-induced dynamic competition of metallic and insulating phase in a layered manganite
Yuelin Li, Donald A. Walko, Qingan Li +4
We show evidence that the competition between the antiferromagetic metallic phase and the charge- and orbital-ordered insulating phase at the reentrant phase boundary of a layered…
Brownmillerite Ca2Co2O5: Synthesis, Stability, and Re-entrant Single-Crystal-to-Single-Crystal Structural Transitions
Junjie Zhang, Hong Zheng, Christos D. Malliakas +5
Ca2Co2O5 in the brownmillerite form was synthesized using a high-pressure optical-image floating zone furnace, and single crystals with dimensions up to 1.4x0.8x0.5 mm3 were obtain…
Creating One-dimensional Nanoscale Periodic Ripples in a Continuous Mosaic Graphene Monolayer
Ke-Ke Bai, Yu Zhou, Hong Zheng +5
In previous studies, it proved difficult to realize periodic graphene ripples with wavelengths of few nanometers. Here we show that one-dimensional periodic graphene ripples with w…
Universal features in the photoemission spectroscopy of high temperature superconductors
J. Zhao, U. Chatterjee, D. Ai +9
The energy gap for electronic excitations is one of the most important characteristics of the superconducting state, as it directly refects the pairing of electrons. In the copper-…
Gigantic magnetic field polarization and magnetoelectric coupling in a ferrimagnetic oxide CaBaCo4O7
V. Caignaert, A. Maignan, K. Singh +7
The single crystal study of CaBaCo4O7, a non collinear ferrimagnet (TC=64K), with a polar orthorhombic space group (Pbn21) between 4 K and 293 K, shows the appearance below TC of a…
Strain Induced One-Dimensional Landau-Level Quantization in Corrugated Graphene
Lan Meng, Wen-Yu He, Hong Zheng +10
Theoretical research has predicted that ripples of graphene generates effective gauge field on its low energy electronic structure and could lead to zero-energy flat bands, which a…
Synthesis and Stoichiometry of MgB2
D. G. Hinks, J. D. Jorgensen, Hong Zheng +1
The system MgxB2 has been investigated to investigate possible nonstoichiometry in MgB2. When synthesized at 850oC, MgB2 is a line compound with a possible Mg vacancy content of ab…
Magnetoconductivity due to Quantum Interference in Strongly Underdoped YBa_2Cu_3O_x
E. Cimpoiasu, G. A. Levin, C. C. Almasan +2
We report magnetoconductivity measurements on YBa_2Cu_3O_x (x=6.25 and 6.36) single crystals. Our main result is that both the in-plane Delta_sigma_ab and out-of-plane Delta_sigma_…
Relationship Between Conductivity and Phase Coherence Length in Cuprates
C. C. Almasan, G. A. Levin, E. Cimpoiasu +7
The large () and strongly temperature dependent resistive anisotropy of cuprates perhaps holds the key to understanding their normal state in-p…