Branton J. Campbell

Brigham Young University

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Harold T. Stokes

Brigham Young University

John S. O. Evans

Durham University

Ivana Radosavljević Evans

Durham University

R. Osborn

Argonne National Laboratory

Stephan Rosenkranz

Argonne National Laboratory

Anthony K. Cheetham

University of California, Santa Barbara

J. F. Mitchell

Argonne National Laboratory

Huiyu Liu

Beijing University of Chemical Technology

Gus L. W. Hart

Brigham Young University

D. N. Argyriou

Helmholtz-Zentrum Berlin für Materialien und Energie

Cooperative Institutions

Brigham Young University

Argonne National Laboratory

National University of Singapore

Oak Ridge National Laboratory

Chinese Academy of Sciences

University of Tennessee at Knoxville

Brookhaven National Laboratory

National Institute of Standards and Technology

Rutherford Appleton Laboratory

University of California, Santa Barbara

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Charge ordering and phase competition in the layered perovskiteLaSr2Mn2O

Physical review. B, Condensed matter (2000)

D. N. Argyriou Heloisa N. Bordallo Branton J. Campbell Anthony K. Cheetham D. E. Cox

Charge-lattice fluctuations are observed in the layered perovskite manganite LaSr2Mn2O7 by Raman spectroscopy as high as 340 K and with decreasing temperature they become static and form a charge ordered (CO) phase below TCO=210 K. In the static regime, superlattice reflections are observed through neutron and x-ray diffraction with a propagation vector (h+1/4,k-1/4,l). Crystallographic analysis of the CO state demonstrates that the degree of charge and orbital ordering in this manganite is weaker than the charge ordering in three dimensional perovskite manganites. A TN=170K a type-A antiferromagnetism (AF) develops and competes with the charge ordering, that eventually melts below T*=100K. High resolution diffraction measurements suggest that that CO- and AF-states do not coincide within the same region in the material but rather co-exist as separate phases. The transition to type-A antiferromagnetism at lower temperatures is characterized by the competition between these two phases.

Manganite

Charge ordering

10.1103/physrevb.61.15269

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Citations (111)

An algebraic approach to cooperative rotations in networks of interconnected rigid units

Acta Crystallographica Section A Foundations and Advances (2018)

Branton J. Campbell Christopher J. Howard Tyler B. Averett Thomas A. Whittle Siegbert Schmid

Crystalline solids consisting of three-dimensional networks of interconnected rigid units are ubiquitous amongst functional materials. In many cases, application-critical properties are sensitive to rigid-unit rotations at low temperature, high pressure or specific stoichiometry. The shared atoms that connect rigid units impose severe constraints on any rotational degrees of freedom, which must then be cooperative throughout the entire network. Successful efforts to identify cooperative-rotational rigid-unit modes (RUMs) in crystals have employed split-atom harmonic potentials, exhaustive testing of the rotational symmetry modes allowed by group representation theory, and even simple geometric considerations. This article presents a purely algebraic approach to RUM identification wherein the conditions of connectedness are used to construct a linear system of equations in the rotational symmetry-mode amplitudes.

Social Connectedness

Harmonic

10.1107/s2053273318009713

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Quantitative Huang-scattering analysis of local structure in

Branton J. Campbell Daniel J. Robertson Stephan Rosenkranz Peter Lee Stine N. Anacona

in ferroelectric relaxor materials like Pb(Zn1=3Nb2=3)O3 and Pb(Mg1=3Nb2=3)O3 are of pressing applied interest due to their in∞uence on the remarkable piezoelectric properties of their solid solutions with PbTiO3. In the recent literature, x-ray and neutron single-crystal difiuse scattering techniques have been shown to provide qualitative insight into the local structure of these materials. Here, we present a quantitative three-dimensional Huang-scattering analysis of 80 keV x-ray single-crystal difiuse scattering data from PZN-4.5%PT.

Biological small-angle scattering

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Dynamic phase transition into a mixed-CDW state in 1$T$-TaS$_2$ via a thermal quench

arXiv (Cornell University) (2024)

A. de la Torre Qi Wang Branton J. Campbell J. V. Riffle D. Balasundaram

Ultrafast light-matter interaction has emerged as a new mechanism to exert control over the macroscopic properties of quantum materials toward novel functionality. To date, technological applications of these non-thermal phases are limited by their ultrashort lifetimes and low-ordering temperatures. Among the most studied photoinduced metastable phases for their technological promise is the hidden metallic charge density wave (H-CDW) in the model correlated CDW compound 1$T$-TaS$_2$. Despite active study and engineering, the nature of the photoinduced H-CDW remains the subject of debate and is only accessible at cryogenic temperatures. Here, we stabilize the H-CDW phase at thermal equilibrium up to near-room temperature by accessing an intermediate mixed CDW order regime via thermal quenching. Using x-ray high dynamic range reciprocal space mapping (HDRM) and scanning tunneling spectroscopy (STS), we reveal the coexistence of commensurate (C) CDW and H-CDW domains below 180 K during cooling and below 210 K during warming. Our findings show that each order parameter breaks basal plane mirror symmetry with different chiral orientations and induces out-of-plane unit cell tripling in the H-CDW phase. Despite metallic domain walls and a finite density of states at zero bias observed via STS, bulk resistance remains insulating due to CDW stacking disorder. This study establishes the H-CDW as a thermally stable phase and introduces a new mechanism for switchable metallic behavior in thin flakes of 1$T$-TaS$_2$ and similar materials with competing order phases.

Mixed phase

10.48550/arxiv.2407.07953

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Polaronic orbital polarization in a layered colossal magnetoresistive manganite

Physical review. B, Condensed matter (2003)

Branton J. Campbell S. K. Sinha R. Osborn Stephan Rosenkranz J. F. Mitchell

The striking anisotropy observed in Huang scattering distributions near the intense Bragg reflections of ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ is shown to be the result of orbitally polarized polarons in the paramagnetic insulating state above ${T}_{C}.$ X-ray single-crystal diffuse scattering patterns from this bilayered colossal magnetoresistive manganite are calculated in terms of the polaronic local structure and compared with experimental measurements. At 300 K, the polaronic ${e}_{g}$ electrons occupy ``out-of-plane'' (i.e., ${3z}^{2}\ensuremath{-}{r}^{2})$ orbitals, leading to ${\mathrm{MnO}}_{6}$ octahedra that are Jahn-Teller elongated along the c axis, perpendicular to the perovskite layers. Between 300 K and ${T}_{C},$ however, the ``orbital polarization'' is shown to shift into the $\mathit{a}\ensuremath{-}\mathit{b}$ plane (i.e., ${3x}^{2}\ensuremath{-}{r}^{2}$ and ${3y}^{2}\ensuremath{-}{r}^{2}$ orbitals), allowing the formation of nanoscale polaron correlations above ${T}_{C}.$

Manganite

Colossal Magnetoresistance

Jahn–Teller effect

Superexchange

10.1103/physrevb.67.020409

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Generalized regular k-point grid generation on the fly

Computational Materials Science (2019)

Wiley S. Morgan John E. Christensen Parker K. Hamilton Jeremy J. Jorgensen Branton J. Campbell

10.1016/j.commatsci.2019.109340

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CCDC 1875172: Experimental Crystal Structure Determination

The Cambridge Structural Database (2018)

Huiyu Liu Weiguo Zhang P. Shiv Halasyamani Harold T. Stokes Branton J. Campbell

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc20y8fp

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CCDC 1875171: Experimental Crystal Structure Determination

The Cambridge Structural Database (2018)

Huiyu Liu Weiguo Zhang P. Shiv Halasyamani Harold T. Stokes Branton J. Campbell

10.5517/ccdc.csd.cc20y8dn

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CCDC 2018886: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Huiyu Liu M. Gutmann Harold T. Stokes Branton J. Campbell Ivana Radosavljević Evans