Viktor V. Poltavets

University of New Orleans

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M. Greenblatt

Rutgers, The State University of New Jersey

Colin K. Blakely

Michigan State University

Shaun R. Bruno

Michigan State University

Mark Croft

Rutgers, The State University of New Jersey

Martin Jansen

Max Planck Institute for Solid State Research

Konstantin A. Lokshin

University of Tennessee at Knoxville

Pavel E. Kazin

Lomonosov Moscow State University

T. Egami

University of Tennessee at Knoxville

Yu. D. Tret’yakov

Moscow State University

Joshua D. Davis

University of Oregon

Cooperative Institutions

Lomonosov Moscow State University

Rutgers, The State University of New Jersey

Michigan State University

Moscow State University

Centre National de la Recherche Scientifique

Los Alamos National Laboratory

Brookhaven National Laboratory

University of California, Davis

Laboratoire de physique des Solides

Russian Academy of Sciences

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Room Temperature Ferromagnetism in Mn-implanted CVD-Grown ZnO Films and Nanostructures

Bulletin of the American Physical Society (2007)

D. H. Hill R. Gateau R. A. Bartynski Ping Wu Ying-Bo Lü

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Characterization of transition metal doped CVD-grown ZnO films and nanostructures

Bulletin of the American Physical Society (2005)

D. Hill R. A. Bartynski L.S. Wieluński Peiyi Wu Yimei Lu

Characterization

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Crystal Structures of Ln₄Ni₃O₈ (Ln = La, Nd) Triple Layer T‘-type Nickelates

Inorganic Chemistry (2007)

Viktor V. Poltavets Konstantin A. Lokshin Mark Croft Tapas Kumar Mandal T. Egami

Single-phase Ln4Ni3O8 (Ln = La, Nd) nickelates were synthesized and their crystal structures were determined by Rietveld refinement of powder neutron diffraction data. The crystal structures of these mixed-valent Ni1+/Ni2+ phases belong to the T'-type and are built by intergrowth of LnO2 fluorite layers with triple NiO2 infinite-layer structural blocks. The major driving force of transformation of the LnO rock-salt block of the parent Ln4Ni3O10-delta Ruddlesden-Popper phases to the fluorite arrangement in the reduced Ln4Ni3O8 phases is attributed to internal structural stress. This transformation allows longer Ni-O bonds in Ln4Ni3O8 without overstretching of the Ln-O bonds, especially in the equatorial plane. The observed displacement of Ni atoms from the outer NiO2 planes toward the Ni atom of the central NiO2 plane in Ln4Ni3O8 is ascribed to large electrostatic repulsion from the fluorite part of the structure. X-ray absorption spectra near the K-edge of Ni suggest that the charge density on the nickel ion is similar for all members of the T'-type Lnn+1NinO2n+2 homologous series, which correlates with nearly constant Ni-O bond lengths observed in all the reduced nickelates. This suggests that the formal changes in the valence state of Ni affect the covalency of the Ni-O bond.

Fluorite

Crystal (programming language)

Rietveld Refinement

10.1021/ic701480v

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Citations (78)

Formation of Stable Phase Inclusions in Bi-2212 and (Bi,Pb)-2223 Materials

Springer eBooks (1999)

Pavel E. Kazin Viktor V. Poltavets V. V. Lennikov Roman Shuba Elena Eremina

10.1007/978-94-011-4732-3_11

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Citations (8)

Synthesis, structure and magnetic properties of A2MnB′O6 (A=Ca, Sr; B′=Sb, Ta) double perovskites

Journal of Solid State Chemistry (2008)

Tapas Kumar Mandal Viktor V. Poltavets Mark Croft M. Greenblatt

Rietveld Refinement

Powder Diffraction

10.1016/j.jssc.2008.04.038

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Citations (55)

Charge-stripe order, antiferromagnetism, and spin dynamics in the cuprate-analog nickelate La4Ni3O8

Physical review. B./Physical review. B (2019)

O. O. Bernal D. E. MacLaughlin G. D. Morris Pei-Chun Ho Lei Shu

We report a muon spin rotation ($\mu$SR) study of the cuprate-analog nickelate La$_4$Ni$_3$O$_8$, which undergoes a transition at 105 K to a low-temperature phase with charge-stripe and antiferromagnetic (AFM) order on square planar NiO$_2$ layers. Zero-field $\mu$SR shows that this transition is abrupt and that the AFM configuration is commensurate. Comparison of observed muon precession frequencies with Ni dipolar field calculations yields Ni moments $\lesssim 0.5\mu_B$. Dynamic muon spin relaxation above 105 K suggests critical slowing of Ni spin fluctuations, but is inconsistent with corresponding $^{139}$La NMR results. Critical slowing and an abrupt transition are also observed in the planar cuprate AFM La$_2$CuO$_{4+\delta}$, where they are evidence for weakly interplanar-coupled two-dimensional AFM spin fluctuations, but our $\mu$SR data do not agree quantitatively with theoretical predictions for this scenario.

Muon spin spectroscopy

Non-blocking I/O

10.1103/physrevb.100.125142

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Citations (15)

Crystal structures and magnetic properties of CaSbxMn1−xO3 perovskites

Journal of Solid State Chemistry (2004)

Viktor V. Poltavets Kanamaluru Vidyasagar Martin Jansen

Orthorhombic crystal system

Space group

Rietveld Refinement

Powder Diffraction

10.1016/j.jssc.2003.11.002

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Citations (14)

Synthesis, Structure, and Magnetic Properties of SrLaMnSbO₆: A New B-Site Ordered Double Perovskite

Chemistry of Materials (2008)

Tapas Kumar Mandal Artem M. Abakumov Maxim V. Lobanov Mark Croft Viktor V. Poltavets

The synthesis, structural characterization, and magnetic property studies of SrLaMnSbO6 double perovskite oxide are reported. The crystal structure of SrLaMnSbO6 has been solved by powder X-ray (PXD) and neutron diffraction (NPD) data in the monoclinic space group P21/n (a = 5.6878(3) Å, b = 5.6990(2) Å, c = 8.0499(4) Å and β = 89.98(2)°; 295 K, NPD data). The Mn and Sb atoms are nearly completely ordered over the B-site of the perovskite structure. The octahedral framework displays significant tilting distortion according to the Glazer's tilt system a−a−c+. X-ray absorption near-edge spectroscopic (XAS) studies show the presence of Mn2+ and Sb5+ formal oxidation states. The magnetic susceptibility data of SrLaMnSbO6 indicate the presence of ferromagnetic correlations; the calculated effective paramagnetic moment, μcalcd = 5.92 μB (for HS Mn2+(3d5), S = 5/2; as evidenced by XAS data) is in good agreement with the value obtained experimentally (μexp = 5.70 μB). Variable temperature neutron diffraction data show no evidence of structural transition down to 3.7 K. A long-range antiferromagnetic ordering is established at TN = 8 K as evidenced by the magnetic susceptibility and specific heat measurements. The magnetic structure at 3.7 K is characterized by k = 0 propagation vector and m1x = −m2x, m1y = m2y = 0, m1z = −m2z (mx = 1.26(7) μB, mz = 1.82(6) μB) coupling of magnetic moments on the Mn1 (1/2,0,0) and Mn2 (0,1/2,1/2) atoms with the ordered magnetic moment of 2.21(4) μB.

Monoclinic crystal system

Magnetic structure

10.1021/cm800583e

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Citations (32)

Effects of ball milling and thermal annealing on size and strain of ASnO3 (A = Ba, Sr) ceramics

Solid State Sciences (2012)

Colin K. Blakely Shaun R. Bruno Zachary J. Baum Viktor V. Poltavets

10.1016/j.solidstatesciences.2012.09.006

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Citations (10)