1
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Block T, Seidel S, Pöttgen R. Bärnighausen Trees – A group–subgroup reference database. Z KRIST-CRYST MATER 2022. [DOI: 10.1515/zkri-2022-0021] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Group–subgroup schemes are a useful tool in crystal chemistry for systemizing crystal structures and they are an indispensable help during X-ray crystallographic studies of complex, twinned and modulated structures. Meanwhile many superstructure variants are summarized within so-called Bärnighausen trees. The present database lists relevant literature with respect to the crystallographic/group-theoretical tools and original work and gives a tabulated overview on the crystallographic fingerprints (aristotype, space group symbol, Pearson code and Wyckoff sequence) of the respective superstructures.
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Affiliation(s)
- Theresa Block
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, 48149 Münster , Germany
| | - Stefan Seidel
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, 48149 Münster , Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, 48149 Münster , Germany
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2
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Baranets S, Darone GM, Bobev S. Structural diversity among multinary pnictide oxides: a minireview focused on semiconducting and superconducting heteroanionic materials. Z KRIST-CRYST MATER 2022. [DOI: 10.1515/zkri-2021-2079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Incorporating different anions with varied ionic sizes and charges is a rapidly growing approach to bring out unusual physical properties among various classes of solid-state materials, pnictides and chalcogenides in particular. This minireview is focused on hetero-anionic materials based on the pnictogens, which have been demonstrated to offer an impressive diversity of crystal chemistry and electronic structures. In addition, many pnictide oxides or oxypnictides, over the course of the last decade, have been shown to exhibit a broad spectrum of superconducting, magnetic, and semiconducting properties. However, the structural diversity of the mixed-anion materials is far greater than the several known structure types, or their variants, of the well-known layered superconductive materials. Therefore, with this treatise, we aim to provide a comprehensive overview of the crystal chemistry of pnictide oxides by recounting almost 40 different structures of such ternary and multinary compounds. In addition to the structural aspects, we also highlight some of the challenges associated with the synthesis, and briefly summarize reported, to date, physical properties of this remarkable class of solids.
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Affiliation(s)
- Sviatoslav Baranets
- Department of Chemistry and Biochemistry , University of Delaware , Newark , DE 19716 , USA
| | | | - Svilen Bobev
- Department of Chemistry and Biochemistry , University of Delaware , Newark , DE 19716 , USA
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3
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Seidel S, Pöttgen R. Coloring and distortion variants of the bcc packing and for the aristotypes BaAl 4 and CeMg 2Si 2. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2021. [DOI: 10.1515/znb-2021-0022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The huge number of intermetallic structure types with many representatives calls for structural systemization. The combination of crystal chemistry with group theory is an efficient tool for such systemization and can be displayed in a concise and compact way via group-subgroup schemes. The present overview deals with such group-subgroup schemes (Bärnighausen trees) for coloring and distortion variants of the bcc packing as well as superstructures that derive from the aristotypes BaAl4 and CeMg2Si2.
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Affiliation(s)
- Stefan Seidel
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
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4
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Engelbert S, Janka O, Klenner S, Pöttgen R. Tin‐rich Phases
RE
2
Au
3
Sn
6
with
RE
= La, Ce, Pr, Nd, Sm – Synthesis, Structure, Magnetic Properties, and
119
Sn Mössbauer Spectra. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.201900329] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Simon Engelbert
- Institut für Anorganische und Analytische Chemie Universität Münster Corrensstrasse 30 48149 Münster Germany
| | - Oliver Janka
- Institut für Anorganische und Analytische Chemie Universität Münster Corrensstrasse 30 48149 Münster Germany
| | - Steffen Klenner
- Institut für Anorganische und Analytische Chemie Universität Münster Corrensstrasse 30 48149 Münster Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie Universität Münster Corrensstrasse 30 48149 Münster Germany
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5
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Abstract
Abstract
Polycrystalline samples of LaRh2Ga2 with the centrosymmetric CaBe2Ge2 type structure were obtained by arc-melting. Small single crystals were grown through a special annealing sequence in an induction furnace. The structures of two different crystals were refined from diffractometer data, confirming the centrosymmetric structure. The 2c Rh sites were refined with anharmonic atomic displacement parameters.
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Affiliation(s)
- Stefan Seidel
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
| | - Lea Schubert
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
| | - Rolf-Dieter Hoffmann
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
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6
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Seidel S, Pöttgen R. Group-subgroup schemes for MoNi4, Nb4N5, KxFe2−ySe2, Nd10Au3As8O10 and CsInCl3: i5 superstructures of I 4/m allowing atom, charge or vacancy ordering. Z KRIST-CRYST MATER 2020. [DOI: 10.1515/zkri-2019-0069] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Isomorphic symmetry reductions are a special class of klassengleiche symmetry reductions where the subgroup has the same space group type. The present contribution highlights five different isomorphic transitions of index 5 (i5), all from I 4/m to I 4/m. These superstructure formations allow (i) atom ordering in MoNi4, (ii) vacancy ordering in Nb4N5, KxFe2−ySe2 and Nd10Au3As8O10 and (iii) charge ordering in CsInCl3 (≡Cs2InIInIIICl6). The group-subgroup schemes in the Bärnighausen formalism are discussed along with the crystal chemical consequences.
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Affiliation(s)
- Stefan Seidel
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30 , 48149 Münster , Germany
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7
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Braun T, Hlukhyy V. CaFe2Ge2 with square-planar iron layers – Closing a gap in the row of CaT2Ge2 (T = Mn–Zn). J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.05.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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8
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Zhou HD, Sarte PM, Conner BS, Balicas L, Wiebe CR, Chen XH, Wu T, Wu G, Liu RH, Chen H, Fang DF. Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:095601. [PMID: 29431150 DOI: 10.1088/1361-648x/aaa3b0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The fluorine-doped rare-earth iron oxypnictide series SmFeAsO1-x F x (0 [Formula: see text] 0.10) was investigated with high resolution powder x-ray scattering. In agreement with previous studies (Margadonna et al 2009 Phys. Rev. B. 79 014503), the parent compound SmFeAsO exhibits a tetragonal-to-orthorhombic structural distortion at [Formula: see text] = 130 K which is rapidly suppressed by [Formula: see text] 0.10 deep within the superconducting dome. The change in unit cell symmetry is followed by a previously unreported magnetoelastic distortion at 120 K. The temperature dependence of the thermal expansion coefficient [Formula: see text] reveals a rich phase diagram for SmFeAsO: (i) a global minimum at 125 K corresponds to the opening of a spin-density wave instability as measured by pump-probe femtosecond spectroscopy (Mertelj et al 2010 Phys. Rev. B 81 224504) whilst (ii) a global maximum at 110 K corresponds to magnetic ordering of the Sm and Fe sublattices as measured by magnetic x-ray scattering (Nandi et al 2011 Phys. Rev. B 84 055419). At much lower temperatures than [Formula: see text], SmFeAsO exhibits a significant negative thermal expansion on the order of -40 ppm · K-1 in contrast to the behaviour of other rare-earth oxypnictides such as PrFeAsO (Kimber et al 2008 Phys. Rev. B 78 140503) and the actinide oxypnictide NpFeAsO (Klimczuk et al 2012 Phys. Rev. B 85 174506) where the onset of [Formula: see text] 0 only appears in the vicinity of magnetic ordering. Correlating this feature with the temperature and doping dependence of the resistivity and the unit cell parameters, we interpret the negative thermal expansion as being indicative of the possible condensation of itinerant electrons accompanying the opening of a SDW gap, consistent with transport measurements (Tropeano et al 2009 Supercond. Sci. Technol. 22 034004).
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Affiliation(s)
- H D Zhou
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, United States of America
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9
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Hlukhyy V, Trots D, Fässler TF. First-Order Phase Transition in BaNi 2Ge 2 and the Influence of the Valence Electron Count on Distortion of the ThCr 2Si 2 Structure Type. Inorg Chem 2017; 56:1173-1185. [PMID: 28085271 DOI: 10.1021/acs.inorgchem.6b02190] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Structural instability has a strong influence on the understanding of superconductivity in iron-containing 122 phases. Similar to the 122 iron-based high-temperature superconductors, the intermetallic compound BaNi2Ge2 undergoes an orthorhombic-to-tetragonal structural phase transition. The compound was prepared by arc-melting mixtures of the elements under an argon atmosphere. Single crystals were obtained by a special heat treatment in a welded tantalum ampule. The crystal structure of the compound was investigated by powder and single-crystal X-ray diffraction. Differential thermal analysis of BaNi2Ge2 showed a reversible phase transition at ca. 480 °C. In situ temperature-dependent synchrotron powder X-ray diffraction studies revealed that below 480 °C the crystal structure of BaNi2Ge2 is orthorhombic [own structure type, space group Pnma, a = 8.3852(4) Å, b = 11.3174(8) Å, and c = 4.2902(9) Å at 30 °C] and the high-temperature phase above 510 °C belongs to the tetragonal ThCr2Si2-type structure [space group I4/mmm, a = 4.2664(1) Å, and c = 11.2537(3) Å at 510 °C]. The reversible first-order low-temperature ↔ high-temperature phase transition around 480 °C is associated with distortion of the [Ni2Ge2] layer of low-temperature modification. The anisotropy of thermal expansion of the unit cell in BaNi2Ge2 was analyzed. The crystal chemistry and chemical bonding are discussed in terms of linear muffin-tin orbital band structure calculations and a topological analysis using the electron localization function. In related compounds, the level of distortion of the uncollapsed tetragonal ThCr2Si2-type structure depends on the valence electron count (VEC).
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Affiliation(s)
- Viktor Hlukhyy
- Department of Chemistry, Technische Universität München , Lichtenbergstrasse 4, 85747 Garching, Germany
| | - Dmytro Trots
- Hamburger Synchrotronstrahlungslabor, DESY , Notkestrasse 85, 22607 Hamburg, Germany
| | - Thomas F Fässler
- Department of Chemistry, Technische Universität München , Lichtenbergstrasse 4, 85747 Garching, Germany
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10
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Bartsch T, Hoffmann RD, Pöttgen R. The quaternary arsenide oxides Ce9Au5–x
As8O6 and Pr9Au5–x
As8O6. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2016. [DOI: 10.1515/znb-2016-0160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The quaternary gold arsenide oxides Ce9Au5−x
As8O6 and Pr9Au5−x
As8O6 were synthesized from the rare earth elements (RE), rare earth oxides, arsenic and gold powder at maximum annealing temperatures of 1173 K. The structures were refined from single crystal X-ray diffractometer data: Pnnm, a=1321.64(6) pm, b=4073.0(3), c=423.96(2), wR2=0.0842, 3106 F
2 values, 160 variables for Ce9Au4.91(4)As8O6 and Pnnm, a=1315.01(4), b=4052.87(8), c=420.68(1) pm, wR2=0.0865, 5313 F
2 values, 160 variables for Pr9Au4.75(1)As8O6. They represent a new structure type and show a further extension of pnictide oxide crystal chemistry. A complex polyanionic gold arsenide network [Au5As8]15− (with some disorder in the gold substructure) is charge compensated with polycationic strands of condensed edge-sharing O@RE
4/4 and O@RE
4/3 tetrahedra ([RE
4O3]2
12+) as well as RE
3+ cations in cavities.
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Affiliation(s)
- Timo Bartsch
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Rolf-Dieter Hoffmann
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
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11
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Hacisalihoglu MY, Paris E, Joseph B, Simonelli L, Sato TJ, Mizokawa T, Saini NL. A study of temperature dependent local atomic displacements in a Ba(Fe(1-x)Co(x))2As2 superconductor. Phys Chem Chem Phys 2016; 18:9029-35. [PMID: 26966734 DOI: 10.1039/c5cp07985c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have studied the local structure of a Ba(Fe(1-x)Co(x))2As2 superconductor using temperature dependent extended X-ray absorption fine structure (EXAFS) measurements. Polarized EXAFS at the Fe K-edge on an optimally doped (x = 0.06) single crystal has permitted us to determine atomic displacements across the superconducting transition temperature (T(c)). The Fe-As bondlength hardly shows any change with temperature; however, the Fe-Fe sublattice reveals a sharp anomaly across T(c), indicated by a significant drop in mean square relative displacements, similar to the one known for cuprates and A15-type superconductors. We have also found a large atomic disorder around the substituted Co, revealed by polarized Co K-edge EXAFS measurements. The Co-Fe/Co bonds are more flexible than the Fe-Fe bonds with the As-height in Co-containing tetrahedra being larger than the one in FeAs4. The results suggest that the local Fe-Fe bondlength fluctuations and the atomic disorder in this sub-lattice should have some important role in the superconductivity of Ba(Fe(1-x)Co(x))2As2 pnictides.
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Affiliation(s)
- M Y Hacisalihoglu
- Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. le Aldo Moro 2, 00185 Roma, Italy. and Department of Physics, Recep Tayyip Erdogan University, 53100 Rize, Turkey and Department of Physics, Karadeniz Technical University, 61080 Trabzon, Turkey
| | - E Paris
- Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. le Aldo Moro 2, 00185 Roma, Italy. and Center for Life NanoScience@Sapienza, Istituto Italiano di Tecnologia, V. le Regina Elena 291, 00185 Rome, Italy
| | - B Joseph
- Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. le Aldo Moro 2, 00185 Roma, Italy. and Elettra, Sincrotrone Trieste, Strada Statale 14, Km 163.5, Basovizza, Trieste, Italy
| | - L Simonelli
- ALBA Synchrotron Light Facility, Crta. BP 1413, Km. 3.3, 08290 Cerdanyola del Vallés, Barcelona, Spain
| | - T J Sato
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
| | - T Mizokawa
- Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan
| | - N L Saini
- Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. le Aldo Moro 2, 00185 Roma, Italy.
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12
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La3Cu4P4O2 and La5Cu4P4O4Cl2: synthesis, structure and 31P solid state NMR spectroscopy. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2015. [DOI: 10.1515/znb-2015-0181] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The phosphide oxides La3Cu4P4O2 and La5Cu4 P4O4Cl2 were synthesized from lanthanum, copper(I) oxide, red phosphorus, and lanthanum(III) chloride through a ceramic technique. Single crystals can be grown in a NaCl/KCl flux. Both structures were refined from single crystal X-ray diffractometer data: I4/mmm, a = 403.89(4), c = 2681.7(3) pm, wR2 = 0.0660, 269 F2 values, 19 variables for La3Cu4P4O2 and a = 407.52(5), c = 4056.8(7) pm, wR2 = 0.0905, 426 F2 values, 27 variables for La5Cu4P4O4Cl2. Refinement of the occupancy parameters revealed full occupancy for the oxygen sites in both compounds. The structures are composed of cationic (La2O2)2+ layers and covalently bonded (Cu4P4)5– polyanionic layers with metallic characteristics, and an additional La3+ between two adjacent (Cu4P4)5– layers. The structure of La5Cu4P4O4Cl2 comprises two additional LaOCl slabs per unit cell. Temperature-dependent magnetic susceptibility studies revealed Pauli paramagnetism. The phosphide substructure of La3Cu4P4O2 was studied by 31P solid state NMR spectroscopy. By using a suitable dipolar re-coupling approach the two distinct resonances belonging to the P2
4– and the P3– units could be identified.
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13
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Delacotte C, Pérez O, Pautrat A, Berthebaud D, Hébert S, Suard E, Pelloquin D, Maignan A. Magnetodielectric Effect in Crystals of the Noncentrosymmetric CaOFeS at Low Temperature. Inorg Chem 2015; 54:6560-5. [DOI: 10.1021/acs.inorgchem.5b00879] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Charlène Delacotte
- Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France
| | - Olivier Pérez
- Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France
| | - Alain Pautrat
- Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France
| | - David Berthebaud
- Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France
| | - Sylvie Hébert
- Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France
| | - Emmanuelle Suard
- Institut Laue-Langevin (ILL), 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Denis Pelloquin
- Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France
| | - Antoine Maignan
- Laboratoire CRISMAT ENSICAEN, UMR CNRS 6508, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex 04, France
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14
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Bartsch T, Niehaus O, Johrendt D, Kobayashi Y, Seto M, Abdala PM, Bartsch M, Zacharias H, Hoffmann RD, Gerke B, Rodewald UC, Pöttgen R. New quaternary arsenide oxides with square planar coordination of gold(I) - structure, (197)Au Mössbauer spectroscopic, XANES and XPS characterization of Nd10Au3As8O10 and Sm10Au3As8O10. Dalton Trans 2015; 44:5854-66. [PMID: 25716906 DOI: 10.1039/c5dt00193e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The quaternary gold(I) arsenide oxides Nd10Au3As8O10 and Sm10Au3As8O10 were synthesized in sealed quartz ampoules from the rare earth (RE) elements, their appropriate sesquioxides, arsenic, arsenic(III) oxide and finely dispersed gold at maximum annealing temperatures of 1223 K. Both structures were refined from X-ray single crystal diffractometer data at room temperature and at 90 K. Nd10Au3As8O10 and Sm10Au3As8O10 crystallize with a new structure type that derives from the BaAl4 structure through distortions and formation of ordered vacancies. The structures consist of stacked polycationic [RE10O10](10+) layers with oxygen in tetrahedral rare earth coordination and polyanionic [Au(I)3(As2)4](10-) layers with gold in square planar or rectangular planar coordination of four arsenic dumbbells (255 pm As1-As2). In contrast to the well known ionic rare earth oxide layers, the gold arsenide layers rather show covalent bonding and account for the metallic nature of these two new arsenide oxides. This is confirmed by electronic structure calculations and resistivity measurements. The oxidation state of gold was investigated by (197)Au Mössbauer, X-ray absorption near edge structure (XANES) and photoelectron (XPS) spectroscopy. Due to missing comparative gold arsenide compounds, the monovalent gold phosphide oxides RE2AuP2O were measured for comparison. The XANES measurements additionally comprise monovalent gold arsenides REAuAs2. The XPS study contains BaAuAs as reference compound instead. Combination of all data clearly indicates Au(I), which was not observed in square planar coordination up to now. Temperature dependent magnetic susceptibility data show Curie-Weiss paramagnetism for Nd10Au3As8O10 and no magnetic ordering down to 2.5 K. Sm10Au3As8O10 shows the typical Van Vleck type paramagnetism for samarium compounds along with a transition to an antiferromagnetically ordered state at TN = 8.6 K.
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Affiliation(s)
- Timo Bartsch
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany.
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15
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Bannikov VV, Ivanovskii AL. Novel magnetic materials based on semiconducting 1111 phases: Theory and experiment. J STRUCT CHEM+ 2015. [DOI: 10.1134/s0022476615010217] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Solokha P, De Negri S, Proserpio DM, Blatov VA, Saccone A. Vacancy Ordering as a Driving Factor for Structural Changes in Ternary Germanides: The New R2Zn1–xGe6 Series of Polar Intermetallics (R = Rare-Earth Metal). Inorg Chem 2015; 54:2411-24. [DOI: 10.1021/ic5030313] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pavlo Solokha
- Dipartimento
di Chimica e Chimica Industriale, Università di Genova, Via Dodecaneso
31, 16146 Genova, Italy
| | - Serena De Negri
- Dipartimento
di Chimica e Chimica Industriale, Università di Genova, Via Dodecaneso
31, 16146 Genova, Italy
| | - Davide M. Proserpio
- Dipartimento
di Chimica, Università degli Studi di Milano, Via Golgi
19, 20133 Milano, Italy
- Samara
Center for Theoretical Materials Science (SCTMS), Samara State University, Ac. Pavlov Street 1 Samara 443011, Russia
| | - Vladislav A. Blatov
- Samara
Center for Theoretical Materials Science (SCTMS), Samara State University, Ac. Pavlov Street 1 Samara 443011, Russia
| | - Adriana Saccone
- Dipartimento
di Chimica e Chimica Industriale, Università di Genova, Via Dodecaneso
31, 16146 Genova, Italy
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17
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Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors. Nat Commun 2014; 5:5761. [PMID: 25482113 DOI: 10.1038/ncomms6761] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 11/05/2014] [Indexed: 11/08/2022] Open
Abstract
Understanding the role played by broken-symmetry states such as charge, spin and orbital orders in the mechanism of emergent properties, such as high-temperature superconductivity, is a major current topic in materials research. That the order may be within one unit cell, such as nematic, was only recently considered theoretically, but its observation in the iron-pnictide and doped cuprate superconductors places it at the forefront of current research. Here, we show that the recently discovered BaTi2Sb2O superconductor and its parent compound BaTi2As2O form a symmetry-breaking nematic ground state that can be naturally explained as an intra-unit-cell nematic charge order with d-wave symmetry, pointing to the ubiquity of the phenomenon. These findings, together with the key structural features in these materials being intermediate between the cuprate and iron-pnictide high-temperature superconducting materials, render the titanium oxypnictides an important new material system to understand the nature of nematic order and its relationship to superconductivity.
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Wolff KK, Shlyk L, Bischoff M, Rose E, Niewa R, Schleid T. Synthesis and Characterization of Superconducting Ca₁ -xNa xFFeAs. MATERIALS 2014; 7:1984-1994. [PMID: 28788551 PMCID: PMC5453247 DOI: 10.3390/ma7031984] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Revised: 02/15/2014] [Accepted: 02/25/2014] [Indexed: 11/16/2022]
Abstract
A representative of the fluoride-containing iron pnictide high-temperature superconductors, namely CaFFeAs, was doped with sodium up to the composition Ca0.86Na0.14FFeAs for the first time. Single crystals with an edge length in the range of 0.1 - 2.0 mm were obtained via solid-state and flux syntheses, respectively. The composition of the crystals was verified by means of single crystal X-ray diffractometry and energy dispersive X-ray spectroscopy (EDX). Measurements of the electrical resistivity, as well as the magnetization on a crystal of Ca0.89Na0.11FFeAs both show a transition to the superconducting state on cooling to 34.5 K. Investigations of the upper critical fields reveal an anisotropy ratio of about five. The lattice parameters and molar volumes increase with rising sodium content. This effect is clearly observable for the c-axis and the volume, whereas the increase of the a-axis is rather minor.
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Affiliation(s)
- Klaus K Wolff
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
| | - Larysa Shlyk
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
| | - Markus Bischoff
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
| | - Eva Rose
- 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
| | - Rainer Niewa
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
| | - Thomas Schleid
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
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20
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Pöttgen R. Coloring, Distortions, and Puckering in Selected Intermetallic Structures from the Perspective of Group-Subgroup Relations. Z Anorg Allg Chem 2014. [DOI: 10.1002/zaac.201400023] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Simonelli L, Al-Zein A, Moretti Sala M, Joseph B, Iadecola A, Bendele M, Martinelli A, Palenzona A, Putti M, Monaco G. Study of the electronic and magnetic properties as a function of isoelectronic substitution in SmFe(1-x)RuxAsO0.85F0.15. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:065701. [PMID: 24451271 DOI: 10.1088/0953-8984/26/6/065701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We have studied the electronic and magnetic properties of SmFe(1-x)RuxAsO0.85F0.15 (x = 0, 0.05, 0.25, 0.33, 0.5) by high-resolution x-ray absorption and x-ray emission spectroscopy. The local Fe magnetic moment (μ) tends to decrease for a small Ru substitution, but it shows a clear increase with further substitution. It appears that impurity scattering prevails in reducing the μ with small Ru substitution due to an extended Ru d-band. A nanoscale phase separation, that decouples the FeAs layers from the spacer layers, drives the increase of μ at higher Ru substitution. The results provide important information on nanoscale phase separation due to isoelectronic substitution in the active layers of iron-based 1111-superconductors and its effect on the local magnetic properties.
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22
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Peschke S, Stürzer T, Johrendt D. Ba1-xRbxFe2As2and Generic Phase Behavior of Hole-doped 122-Type Superconductors. Z Anorg Allg Chem 2014. [DOI: 10.1002/zaac.201300668] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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23
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Heymann G, Riecken JF, Johrendt D, Rayaprol S, Pöttgen R, Huppertz H. Ce4Ag3Ge4O(0.5)--chains of oxygen-centered [OCe2Ce(2/2)] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix. Dalton Trans 2013; 42:15207-13. [PMID: 24030014 DOI: 10.1039/c3dt51683k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The oxidation of an intermetallic phase under high-pressure/high-temperature conditions led to the synthesis of Ce4Ag3Ge4O(0.5) exhibiting [OCe2Ce(2/2] tetrahedral chains, in which the oxygen atoms statistically occupy the tetrahedral centres. Starting from a 1:1:1 CeAgGe precursor (NdPtSb type), a multianvil high-pressure/high-temperature experiment at 11.5 GPa and 1250-1300 °C revealed Ce4Ag3Ge4O(0.5), crystallizing in the space group Pnma with the following lattice parameters: a = 2087.3(4), b = 439.9(1), and c = 1113.8(2) pm. Magnetic measurements showed Curie-Weiss behavior above 100 K with an experimental magnetic moment of 2.42 µB per Ce atom, close to the value for the free Ce(3+) ion, clearly indicating trivalent cerium in Ce4Ag3Ge4O(0.5). Full potential GGA+U band structure calculations resulted in metallic properties and a magnetic ground state with one unpaired 4f-electron per cerium in agreement with the experiments.
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Affiliation(s)
- Gunter Heymann
- Institut für Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria.
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24
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Bartsch T, Wiegand T, Ren J, Eckert H, Johrendt D, Niehaus O, Eul M, Pöttgen R. Phosphide Oxides RE2AuP2O (RE = La, Ce, Pr, Nd): Synthesis, Structure, Chemical Bonding, Magnetism, and 31P and 139La Solid State NMR. Inorg Chem 2013; 52:2094-102. [DOI: 10.1021/ic302475u] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Timo Bartsch
- Institut für Anorganische
und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Thomas Wiegand
- Institut für Physikalische Chemie, Universität Münster, Corrensstrasse 30,
48149 Münster, Germany
| | - Jinjun Ren
- Institut für Physikalische Chemie, Universität Münster, Corrensstrasse 30,
48149 Münster, Germany
| | - Hellmut Eckert
- Institut für Physikalische Chemie, Universität Münster, Corrensstrasse 30,
48149 Münster, Germany
| | - Dirk Johrendt
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München,
Germany
| | - Oliver Niehaus
- Institut für Anorganische
und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Matthias Eul
- Institut für Anorganische
und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische
und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
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25
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26
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Doan P, Gooch M, Tang Z, Lorenz B, Möller A, Tapp J, Chu PCW, Guloy AM. Ba1–xNaxTi2Sb2O (0.0 ≤ x ≤ 0.33): A Layered Titanium-Based Pnictide Oxide Superconductor. J Am Chem Soc 2012; 134:16520-3. [DOI: 10.1021/ja3078889] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | - Paul C. W. Chu
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California
94720, United States
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McGuire MA, May AF, Sales BC. Crystallographic and magnetic phase transitions in the layered ruthenium oxyarsenides TbRuAsO and DyRuAsO. Inorg Chem 2012; 51:8502-8. [PMID: 22835000 DOI: 10.1021/ic3010695] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The crystallographic and physical properties of TbRuAsO and DyRuAsO at and below room temperature are reported, including full structure refinements from powder X-ray diffraction data and measured electrical and thermal transport properties, magnetic susceptibility, and heat capacity. Both compounds are isostructural to LaFeAsO (ZrCuSiAs-type, P4/nmm) at room temperature. However, DyRuAsO undergoes a symmetry-lowering crystallographic phase transition near 25 K, and adopts an orthorhombic structure (Pmmn) below this temperature. This structural distortion is unlike those observed in the analogous Fe compounds. Magnetic phase transitions are observed in both compounds which suggest antiferromagnetic ordering of lanthanide moments occurs near 7.0 K in TbRuAsO and 10.5 K in DyRuAsO. The nature of the structural distortion as well as thermal conductivity and heat capacity behaviors indicate strong coupling between the magnetism and the lattice. The behaviors of both materials show magnetic ordering of small moments on Ru may occur at low temperatures.
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Affiliation(s)
- Michael A McGuire
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
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28
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Charkin DO, Urmanov AV, Kazakov SM, Batuk D, Abakumov AM, Knöner S, Gati E, Wolf B, Lang M, Shevelkov AV, Tendeloo GV, Antipov EV. Synthesis, Crystal Structure, Transport, and Magnetic Properties of Novel Ternary Copper Phosphides, A2Cu6P5 (A = Sr, Eu) and EuCu4P3. Inorg Chem 2012; 51:8948-55. [PMID: 22849708 DOI: 10.1021/ic301033h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dmitri O. Charkin
- Department of Chemistry, M.V.
Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Arthur V. Urmanov
- Department of Chemistry, M.V.
Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Sergey M. Kazakov
- Department of Chemistry, M.V.
Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Dmitri Batuk
- Electron Microscopy for Materials
Research (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020
Antwerp, Belgium
| | - Artem M. Abakumov
- Department of Chemistry, M.V.
Lomonosov Moscow State University, 119991 Moscow, Russia
- Electron Microscopy for Materials
Research (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020
Antwerp, Belgium
| | - Stephan Knöner
- Physikalisches
Institut, Universität
Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt, Germany
| | - Elena Gati
- Physikalisches
Institut, Universität
Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt, Germany
| | - Bernd Wolf
- Physikalisches
Institut, Universität
Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt, Germany
| | - Michael Lang
- Physikalisches
Institut, Universität
Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt, Germany
| | - Andrey V. Shevelkov
- Department of Chemistry, M.V.
Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Gustaaf Van Tendeloo
- Electron Microscopy for Materials
Research (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020
Antwerp, Belgium
| | - Evgeni V. Antipov
- Department of Chemistry, M.V.
Lomonosov Moscow State University, 119991 Moscow, Russia
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29
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Friederichs GM, Schellenberg I, Pöttgen R, Duppel V, Kienle L, auf der Günne JS, Johrendt D. Metastable 11 K Superconductor Na1–yFe2–xAs2. Inorg Chem 2012; 51:8161-7. [DOI: 10.1021/ic3005618] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gina M. Friederichs
- Department Chemie, Ludwig-Maximilians-Universtiät München, Butenandtstrasse 5-13 (D), 81377 München,
Germany
| | - Inga Schellenberg
- Institut für
Anorganische
und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für
Anorganische
und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Viola Duppel
- Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse
1, 70569 Stuttgart, Germany
| | - Lorenz Kienle
- Institut für Materialwissenschaft, Christian-Albrechts-Universität Kiel, Kaiserstrasse
2, 24143 Kiel, Germany
| | - Jörn Schmedt auf der Günne
- Department Chemie, Ludwig-Maximilians-Universtiät München, Butenandtstrasse 5-13 (D), 81377 München,
Germany
| | - Dirk Johrendt
- Department Chemie, Ludwig-Maximilians-Universtiät München, Butenandtstrasse 5-13 (D), 81377 München,
Germany
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30
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Pfannenschmidt U, Behrends F, Lincke H, Eul M, Schäfer K, Eckert H, Pöttgen R. CaBe2Ge2 type phosphides REIr2P2 (RE = La–Nd, Sm) and arsenides REIr2As2 (RE = La–Nd): synthesis, structure, and solid state NMR spectroscopy. Dalton Trans 2012; 41:14188-96. [DOI: 10.1039/c2dt31874a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Eul M, Möller MH, Hoffmann RD, Jeitschko W, Pöttgen R. A Further Extension of Pnictide Oxide Chemistry - Synthesis and Structure of La2AuP2O. Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201100494] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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