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Records |
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Author |
Ardashnikova, E.I.; Lubarsky, S.V.; Denisenko, D.I.; Shpanchenko, R.V.; Antipov, E.V.; Van Tendeloo, G. |
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Title |
A new way of synthesis and characterization of superconducting oxyfluoride Sr2Cu(O,F)4+\delta |
Type |
A1 Journal article |
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Year |
1995 |
Publication |
Physica: C : superconductivity |
Abbreviated Journal |
Physica C |
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Volume |
253 |
Issue |
3/4 |
Pages |
259-265 |
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Keywords |
A1 Journal article; Electron microscopy for materials research (EMAT) |
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Abstract |
Superconducting Cu mixed oxyfluoride, Sr,Cu(O, F)(4+delta), was Obtained via fluorination of Sr2CuO3 by XeF2 in the 100-250 degrees C temperature range in a closed Ni container. The prepared samples exhibited a lower T-c in comparison with earlier reported values. Different samples in the Sr-Cu-O-F system were prepared by a solid-state reaction at 220-400 degrees C, but no formation of the oxyfluoride was detected even with an addition of xenon difluoride. These data allow one to draw conclusions on the metastability of the oxyfluoride under the conditions used, Electron microscopy and X-ray powder diffraction studies revealed large amounts of badly crystallized SrF2; this could be a reason for the small superconducting volume fraction as well as for the inhomogeneous distribution of the anions. |
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Place of Publication |
Amsterdam |
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Wos |
A1995TE08400007 |
Publication Date |
0000-00-00 |
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ISSN |
0921-4534 |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
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Impact Factor |
0.942 |
Times cited |
29 |
Open Access |
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Notes |
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Approved |
PHYSICS, APPLIED 28/145 Q1 # |
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Call Number |
UA @ lucian @ c:irua:13322 |
Serial |
2337 |
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Author |
Nistor, L.; Van Tendeloo, G.; Amelinckx, S.; Shpanchenko, R.V.; van Landuyt, J. |
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Title |
Ordering and defects in BanTaxTiyO3n ternary oxides |
Type |
P1 Proceeding |
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Year |
1994 |
Publication |
Electron Microscopy 1994, Vols 2a And 2b: Applications In Materials Sciences |
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Volume |
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Issue |
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Pages |
869-870 |
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Keywords |
P1 Proceeding; Electron microscopy for materials research (EMAT) |
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Wos |
A1994BE09Y00422 |
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0000-00-00 |
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ISSN |
2-86883-226-1 |
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Additional Links |
UA library record; WoS full record; |
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Call Number |
UA @ lucian @ c:irua:104477 |
Serial |
2504 |
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Author |
Van Tendeloo, G.; Lebedev, O.I.; Shpanchenko, R.V.; Antipov, E.V. |
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Title |
Structure determination of YBCO fluorinated phases by HREM |
Type |
A1 Journal article |
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Year |
1997 |
Publication |
Journal of electron microscopy |
Abbreviated Journal |
Microscopy-Jpn |
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Volume |
1 |
Issue |
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Pages |
23-31 |
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Keywords |
A1 Journal article; Electron microscopy for materials research (EMAT) |
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Place of Publication |
Tokyo |
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Publication Date |
0000-00-00 |
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ISSN |
0022-0744; 1477-9986 |
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Additional Links |
UA library record |
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Impact Factor |
0.9 |
Times cited |
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Approved |
Most recent IF: NA |
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Call Number |
UA @ lucian @ c:irua:21418 |
Serial |
3301 |
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Author |
Lebedev, O.I.; Van Tendeloo, G.; Abakumov, A.M.; Shpanchenko, R.V.; Rozova, M.G.; Antipov, E.V. |
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Title |
Structure of Y123 and Y247 fluorinated phases by HREM |
Type |
A1 Journal article |
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Year |
1998 |
Publication |
Electron microscopy: vol. 3 |
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Issue |
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Pages |
297-298 |
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Keywords |
A1 Journal article; Electron microscopy for materials research (EMAT) |
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Wos |
000077020300142 |
Publication Date |
0000-00-00 |
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Additional Links |
UA library record; WoS full record; |
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Approved |
Most recent IF: NA |
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Call Number |
UA @ lucian @ c:irua:25673 |
Serial |
3315 |
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Author |
Oleynikov, P.N.; Shpanchenko, R.V.; Rozova, M.G.; Abakumov, A.M.; Antipov, E.V.; Hadermann, J.; Lebedev, O.I.; Van Tendeloo, G. |
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Title |
Synthesis and structure of fluorinated RBa2Cu2O6+. (R=Dy, Ho and Tm) phases |
Type |
A1 Journal article |
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Year |
2001 |
Publication |
Russian journal of inorganic chemistry |
Abbreviated Journal |
Russ J Inorg Chem+ |
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Volume |
46 |
Issue |
2 |
Pages |
153-158 |
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Keywords |
A1 Journal article; Electron microscopy for materials research (EMAT) |
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Place of Publication |
London |
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Publication Date |
0000-00-00 |
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ISSN |
0036-0236 |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
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Impact Factor |
0.787 |
Times cited |
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Open Access |
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Notes |
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Approved |
Most recent IF: 0.787; 2001 IF: NA |
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Call Number |
UA @ lucian @ c:irua:36045 |
Serial |
3443 |
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Permanent link to this record |
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Author |
Tsirlin, A.A.; Nath, R.; Abakumov, A.M.; Shpanchenko, R.V.; Geibel, C.; Rosner, H. |
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Title |
Frustrated square lattice with spatial anisotropy: crystal structure and magnetic properties of PbZnVO(PO4)2 |
Type |
A1 Journal article |
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Year |
2010 |
Publication |
Physical review : B : condensed matter and materials physics |
Abbreviated Journal |
Phys Rev B |
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Volume |
81 |
Issue |
17 |
Pages |
174424,1-174424,13 |
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Keywords |
A1 Journal article; Electron microscopy for materials research (EMAT) |
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Abstract |
Crystal structure and magnetic properties of the layered vanadium phosphate PbZnVO(PO4)2 are studied using x-ray powder diffraction, magnetization and specific-heat measurements, as well as band-structure calculations. The compound resembles AA′VO(PO4)2 vanadium phosphates and fits to the extended frustrated square-lattice model with the couplings J1, J1′ between nearest neighbors and J2, J2′ between next-nearest neighbors. The temperature dependence of the magnetization yields estimates of averaged nearest-neighbor and next-nearest-neighbor couplings, J̅ 1≃−5.2 K and J̅ 2≃10.0 K, respectively. The effective frustration ratio α=J̅ 2/J̅ 1 amounts to −1.9 and suggests columnar antiferromagnetic ordering in PbZnVO(PO4)2. Specific-heat data support the estimates of J̅ 1 and J̅ 2 and indicate a likely magnetic ordering transition at 3.9 K. However, the averaged couplings underestimate the saturation field, thus pointing to the spatial anisotropy of the nearest-neighbor interactions. Band-structure calculations confirm the identification of ferromagnetic J1, J1′ and antiferromagnetic J2, J2′ in PbZnVO(PO4)2 and yield (J1′−J1)≃1.1 K in excellent agreement with the experimental value of 1.1 K, deduced from the difference between the expected and experimentally measured saturation fields. Based on the comparison of layered vanadium phosphates with different metal cations, we show that a moderate spatial anisotropy of the frustrated square lattice has minor influence on the thermodynamic properties of the model. We discuss relevant geometrical parameters, controlling the exchange interactions in these compounds and propose a strategy for further design of strongly frustrated square-lattice materials. |
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Wos |
000278141600082 |
Publication Date |
2010-05-25 |
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Series Issue |
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Edition |
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ISSN |
1098-0121;1550-235X; |
ISBN |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
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Impact Factor |
3.836 |
Times cited |
27 |
Open Access |
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Notes |
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Approved |
Most recent IF: 3.836; 2010 IF: 3.774 |
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Call Number |
UA @ lucian @ c:irua:83384 |
Serial |
1294 |
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Permanent link to this record |