Electron and phonon transport in single crystal tetragonal niobium bronzes

• Project/Area Number: 26400323
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: National Institute for Materials Science
• Principal Investigator: Kolodiazhnyi Taras 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点 強相関物質グループ, 主幹研究員 (80469767)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: tetragonal bronze / thermal conductivity / thermoelectric power / charge density wave / anderson localization / Tetragonal bronze / metal-insulator / Anderson localization / metal insulator / low-dimensional systems

Outline of Final Research Achievements

Solid solution of Ba6-xSrxNb10O30 crystalizes in filled tetragonal tungsten bronze (TTB) structure. Our results indicate that the Ba and Sr ions show complete solid solution without miscibility gap. We studied the x dependence of thermal conductivity of polycrystalline Ba6-xSrxNb10O30 samples measured in the 2-400 K temperature interval. Substitution of Sr for Ba brings about a significant decrease in thermal conductivity at x>3 accompanied by development of a low-temperature (T = 10-30 K) plateau region reminiscent of a glass-like compounds. We explain this behavior based on a size-driven site occupancy and atomic displacement parameters. Measurement of the electron transport of the Ba6-xSrxNb10O30 solid solution reveals an unusual metal to insulator transition which occurs upon contraction of the unit cell. Another important finding of this project was the discovery of the low-temperature superconductivity at Tc<1.6 K in the Ba-rich members of the Ba6-xSrxNb10O30 solid solution.

Research Products

• [Int'l Joint Research] Harvard University(米国)
• [Int'l Joint Research] McMaster University(Canada)
• [Journal Article] Magnetic, optical and electron transport properties of n-type CeO2: Small polarons versus Anderson localization (2017)
  • Author(s): T. Kolodiazhnyi, T. Charoonsuk, Y.-S. Seo, S. Chang, N. Vittayakorn, J. Hwang
  • Journal Title: Physical Review B Volume: 95 Issue: 4 Pages: 045203-045203
  • DOI: 10.1103/physrevb.95.045203
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Defect chemistry of Ta-doped CeO2 (2017)
  • Author(s): T. Charoonsuk, N. Vittayakorn, T. Kolodiazhnyi
  • Journal Title: J. Alloys Comp. Volume: 695 Pages: 1317-1323
  • DOI: 10.1016/j.jallcom.2016.10.272
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Origin of magnetoelectric effect in Co4Nb2O9 and Co4Ta2O9: The lessons learned from the comparison of first-principles-based theoretical models and experimental data (2016)
  • Author(s): I. V. Solovyev, T. Kolodiazhnyi
  • Journal Title: Physical Review B Volume: 94 Issue: 9 Pages: 094427-094427
  • DOI: 10.1103/physrevb.94.094427
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Unusual lattice evolution and magnetochemistry of Nb doped CeO2 (2016)
  • Author(s): T. Kolodiazhnyi, H. Sakurai, A. A. Belik, O. V. Gornostaeva
  • Journal Title: Acta Materialia Volume: 113 Pages: 116-123
  • DOI: 10.1016/j.actamat.2016.04.052
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Superconductivity and crystal structural origins of the metal-insulator transition in Ba6-xSrxNb10O30 tetragonal tungsten bronzes (2015)
  • Author(s): Taras Kolodiazhnyi, Hiroya Sakurai, Masaaki Isobe, Yoshitaka Matsushita, Scott Forbes, Yurij Mozharivskyj, Timothy J. S. Munsie, Graeme M. Luke, Mary Gurak, and David R. Clarke
  • Journal Title: Physical Review B Volume: 92 Issue: 21 Pages: 214508-214508
  • DOI: 10.1103/physrevb.92.214508
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Crystal structure and physical properties of Cr and Mn oxides with 3d 3 electronic configuration and a K2NiF4-type structure (2015)
  • Author(s): Ting-Hui Kao, Hiroya Sakurai, Taras Kolodiazhnyi, Yutaro Suzuki, Momoko Okabe, Toru Asaka, Koichiro Fukuda, Susumu Okubo, Shohei Ikeda, Shigeo Hara, Takahiro Sakurai, Hitoshi Ohta, Hung-Duen Yang
  • Journal Title: Journal of Materials Chemistry C Volume: 3 Issue: 14 Pages: 3452-3459
  • DOI: 10.1039/c4tc02458c
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic and transport properties of Co1 plus/minus delta Cr2 minus/plus delta Se4 (2015)
  • Author(s): Volodymyr Svitlyk, Taras Kolodiazhnyi, Lachlan MD Cranswick, Graeme Luke, Yurij Mozharivskyj
  • Journal Title: Materials Research Express Volume: 2 Issue: 10 Pages: 105004-105004
  • DOI: 10.1088/2053-1591/2/10/105004
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic properties and AC losses in AFe2O4 (A = Mn, Co, Ni, Zn) nanoparticles synthesized from nonaqueous solution (2015)
  • Author(s): O. V. Yelenich, S. O. Solopan, T. Kolodiazhnyi, Yu. O. Tykhonenko, A. I. Tovstolytkin, A.G. Belous.
  • Journal Title: Journal of Chemistry Volume: 2015 Pages: 532198-532198
  • DOI: 10.1155/2015/532198
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Abnormal thermal conductivity in tetragonal tungsten bronze-type Ba6-xSrxNb10O30 (2014)
  • Author(s): T. Kolodiazhnyi, H. Sakurai, O. Vasylkiv, H. Borodianska, Y. Mozharivskyj
  • Journal Title: Applied Physics Letters Volume: 104 Issue: 11 Pages: 111903-111903
  • DOI: 10.1063/1.4868876
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Structure and physical properties of EuTa2O6 tungsten bronze polymorph. (2014)
  • Author(s): T. Kolodiazhnyi, H. Sakurai, O. Vasylkiv, H. Borodianska, S. Forbes, Y. Mozharivskyj
  • Journal Title: Applied Physics Letters Volume: 105 Issue: 6 Pages: 062902-062902
  • DOI: 10.1063/1.4893011
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Structure, magnetism, specific heat, and dielectric properties of Eu2Ta2O7 (2014)
  • Author(s): T. Kolodiazhnyi, H. Sakurai, Y. Matsushita
  • Journal Title: Applied Physics Letters Volume: 105 Issue: 20 Pages: 202903-202903
  • DOI: 10.1063/1.4902345
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Origin of extrinsic dielectric loss in 1:2 ordered, single-phase BaMg1/3Ta2/3O3 (2014)
  • Author(s): T. Kolodiazhnyi
  • Journal Title: Journal of the European Ceramic Society Volume: 34 Issue: 7 Pages: 1741-1753
  • DOI: 10.1016/j.jeurceramsoc.2013.12.037
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Synthesis Crystal Structure and Electronic Properties of the CaRE3SbO4 and Ca2RE8Sb3O10 phases (RE = Rare-Earth Metal) (2014)
  • Author(s): Scott Forbes, F. Yuan, B. Saparov, A. S. Sefat, K. Kosuda, T. Kolodiazhnyi, Yurij Mozharivsky
  • Journal Title: Chemistry of Materials Volume: 26 Issue: 7 Pages: 2289-2298
  • DOI: 10.1021/cm500157y
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Effect of local lattice disorder on the metal insulator transition in Ba6-xSrxNb10O30 tetragonal niobium bronzes (2015)
  • Author(s): Taras Kolodiazhnyi
  • Organizer: The 7 th International Conference on Electroceramics (ICE2015)
  • Place of Presentation: Penn State University, Pennsylvania, U.S.A.
  • Year and Date: 2015-05-13
  • Invited
• [Presentation] Extrinsic dielectric loss in single phase, atomically ordered Ba(Mg1/3M2/3O3 where M = Nb, Ta (2014)
  • Author(s): T. Kolodiazhnyi
  • Organizer: Microwave Materials and Applications
  • Place of Presentation: Boise, Idaho, U.S.A.
  • Year and Date: 2014-06-01 – 2014-06-04
  • Invited