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Items: 1 to 50 of 77

1.

Synthesis of Polyazobenzenes Exhibiting Photoisomerization and Liquid Crystallinity.

Otaki M, Kumai R, Sagayama H, Goto H.

Polymers (Basel). 2019 Feb 17;11(2). pii: E348. doi: 10.3390/polym11020348.

2.

A Brønsted-Ligand-Based Iron Complex as a Molecular Switch with Five Accessible States.

Shiga T, Saiki R, Akiyama L, Kumai R, Natke D, Renz F, Cameron JM, Newton GN, Oshio H.

Angew Chem Int Ed Engl. 2019 Apr 16;58(17):5658-5662. doi: 10.1002/anie.201900909. Epub 2019 Mar 20.

PMID:
30753754
3.

Substituent dependence on the spin crossover behaviour of mononuclear Fe(ii) complexes with asymmetric tridentate ligands.

Saiki R, Miyamoto H, Sagayama H, Kumai R, Newton GN, Shiga T, Oshio H.

Dalton Trans. 2019 Mar 14;48(10):3231-3236. doi: 10.1039/c9dt00204a. Epub 2019 Feb 5.

PMID:
30720038
4.

Carboxylic Acid Functionalized Spin-Crossover Iron(II) Grids for Tunable Switching and Hybrid Electrode Fabrication.

Shiga T, Sato Y, Tachibana M, Sato H, Matsumoto T, Sagayama H, Kumai R, Murakami Y, Newton GN, Oshio H.

Inorg Chem. 2018 Nov 19;57(22):14013-14017. doi: 10.1021/acs.inorgchem.8b01856. Epub 2018 Oct 31.

PMID:
30379073
5.

Pressure-induced coherent sliding-layer transition in the excitonic insulator Ta2NiSe5.

Nakano A, Sugawara K, Tamura S, Katayama N, Matsubayashi K, Okada T, Uwatoko Y, Munakata K, Nakao A, Sagayama H, Kumai R, Sugimoto K, Maejima N, Machida A, Watanuki T, Sawa H.

IUCrJ. 2018 Jan 26;5(Pt 2):158-165. doi: 10.1107/S2052252517018334. eCollection 2018 Mar 1.

6.

Semiconductive Single Molecular Bilayers Realized Using Geometrical Frustration.

Arai S, Inoue S, Hamai T, Kumai R, Hasegawa T.

Adv Mater. 2018 Jun;30(23):e1707256. doi: 10.1002/adma.201707256. Epub 2018 Apr 25.

PMID:
29691910
7.

Strong polarization switching with low-energy loss in hydrogen-bonded organic antiferroelectrics.

Horiuchi S, Kumai R, Ishibashi S.

Chem Sci. 2017 Nov 1;9(2):425-432. doi: 10.1039/c7sc03859c. eCollection 2018 Jan 14.

8.

Cluster-Based Haldane State in an Edge-Shared Tetrahedral Spin-Cluster Chain: Fedotovite K_{2}Cu_{3}O(SO_{4})_{3}.

Fujihala M, Sugimoto T, Tohyama T, Mitsuda S, Mole RA, Yu DH, Yano S, Inagaki Y, Morodomi H, Kawae T, Sagayama H, Kumai R, Murakami Y, Tomiyasu K, Matsuo A, Kindo K.

Phys Rev Lett. 2018 Feb 16;120(7):077201. doi: 10.1103/PhysRevLett.120.077201.

PMID:
29542973
9.

Field-Induced Antipolar-Polar Structural Transformation and Giant Electrostriction in Organic Crystal.

Kobayashi K, Horiuchi S, Ishibashi S, Murakami Y, Kumai R.

J Am Chem Soc. 2018 Mar 21;140(11):3842-3845. doi: 10.1021/jacs.7b13688. Epub 2018 Mar 9.

PMID:
29505710
10.

Possible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K3Cu3AlO2(SO4)4.

Fujihala M, Koorikawa H, Mitsuda S, Morita K, Tohyama T, Tomiyasu K, Koda A, Okabe H, Itoh S, Yokoo T, Ibuka S, Tadokoro M, Itoh M, Sagayama H, Kumai R, Murakami Y.

Sci Rep. 2017 Dec 1;7(1):16785. doi: 10.1038/s41598-017-16935-9.

11.

Crystallization and vitrification of electrons in a glass-forming charge liquid.

Sasaki S, Hashimoto K, Kobayashi R, Itoh K, Iguchi S, Nishio Y, Ikemoto Y, Moriwaki T, Yoneyama N, Watanabe M, Ueda A, Mori H, Kobayashi K, Kumai R, Murakami Y, Müller J, Sasaki T.

Science. 2017 Sep 29;357(6358):1381-1385. doi: 10.1126/science.aal3120. Epub 2017 Sep 28.

PMID:
28963251
12.

Proton tautomerism for strong polarization switching.

Horiuchi S, Kobayashi K, Kumai R, Ishibashi S.

Nat Commun. 2017 Feb 16;8:14426. doi: 10.1038/ncomms14426.

13.

Pressure effect on iron-based superconductor LaFeAsO1-xHx: Peculiar response of 1111-type structure.

Kobayashi K, Yamaura JI, Iimura S, Maki S, Sagayama H, Kumai R, Murakami Y, Takahashi H, Matsuishi S, Hosono H.

Sci Rep. 2016 Dec 22;6:39646. doi: 10.1038/srep39646.

14.

Solvent-induced on/off switching of intramolecular electron transfer in a cyanide-bridged trigonal bipyramidal complex.

Wei RJ, Nakahara R, Cameron JM, Newton GN, Shiga T, Sagayama H, Kumai R, Murakami Y, Oshio H.

Dalton Trans. 2016 Nov 1;45(43):17104-17107.

PMID:
27757466
15.

Redox-Dependent Transformation of a Hydrazinobuckybowl between Curved and Planar Geometries.

Higashibayashi S, Pandit P, Haruki R, Adachi S, Kumai R.

Angew Chem Int Ed Engl. 2016 Aug 26;55(36):10830-4. doi: 10.1002/anie.201605340. Epub 2016 Aug 5.

PMID:
27491494
16.

Few-Volt Operation of Printed Organic Ferroelectric Capacitor.

Noda Y, Yamada T, Kobayashi K, Kumai R, Horiuchi S, Kagawa F, Hasegawa T.

Adv Mater. 2015 Nov 4;27(41):6475-81. doi: 10.1002/adma.201502357. Epub 2015 Sep 30.

PMID:
26419689
17.

Modulation of a Molecular π-Electron System in a Purely Organic Conductor that Shows Hydrogen-Bond-Dynamics-Based Switching of Conductivity and Magnetism.

Ueda A, Hatakeyama A, Enomoto M, Kumai R, Murakami Y, Mori H.

Chemistry. 2015 Oct 12;21(42):15020-8. doi: 10.1002/chem.201502047. Epub 2015 Aug 27.

PMID:
26311352
18.

Quantum ferroelectricity in charge-transfer complex crystals.

Horiuchi S, Kobayashi K, Kumai R, Minami N, Kagawa F, Tokura Y.

Nat Commun. 2015 Jun 16;6:7469. doi: 10.1038/ncomms8469.

19.

Structure-property relationship of supramolecular ferroelectric [H-66dmbp][Hca] accompanied by high polarization, competing structural phases, and polymorphs.

Kobayashi K, Horiuchi S, Ishibashi S, Kagawa F, Murakami Y, Kumai R.

Chemistry. 2014 Dec 22;20(52):17515-22. doi: 10.1002/chem.201404759. Epub 2014 Oct 31.

PMID:
25363720
20.

Solid-solid phase interconversion in an organic conductor crystal: hydrogen-bond-mediated dynamic changes in π-stacked molecular arrangement and physical properties.

Yoshida J, Ueda A, Nakao A, Kumai R, Nakao H, Murakami Y, Mori H.

Chem Commun (Camb). 2014 Dec 21;50(98):15557-60. doi: 10.1039/c4cc07810a. Epub 2014 Oct 30.

PMID:
25356679
21.

Hydrogen-bond-dynamics-based switching of conductivity and magnetism: a phase transition caused by deuterium and electron transfer in a hydrogen-bonded purely organic conductor crystal.

Ueda A, Yamada S, Isono T, Kamo H, Nakao A, Kumai R, Nakao H, Murakami Y, Yamamoto K, Nishio Y, Mori H.

J Am Chem Soc. 2014 Aug 27;136(34):12184-92. doi: 10.1021/ja507132m. Epub 2014 Aug 15.

PMID:
25127315
22.

Programmable spin-state switching in a mixed-valence spin-crossover iron grid.

Matsumoto T, Newton GN, Shiga T, Hayami S, Matsui Y, Okamoto H, Kumai R, Murakami Y, Oshio H.

Nat Commun. 2014 May 15;5:3865. doi: 10.1038/ncomms4865.

PMID:
24832549
23.

Hydrogen ordering and new polymorph of layered perovskite oxyhydrides: Sr₂VO(4-x)H(x).

Bang J, Matsuishi S, Hiraka H, Fujisaki F, Otomo T, Maki S, Yamaura J, Kumai R, Murakami Y, Hosono H.

J Am Chem Soc. 2014 May 21;136(20):7221-4. doi: 10.1021/ja502277r. Epub 2014 May 12.

PMID:
24802944
24.

X-ray-induced phase transitions by selective excitation of heterometal ions in a cyanide-bridged Fe-Co molecular square.

Sekine Y, Nihei M, Kumai R, Nakao H, Murakami Y, Oshio H.

Chem Commun (Camb). 2014 Apr 21;50(31):4050-2. doi: 10.1039/c3cc48820a.

PMID:
24473334
25.

Protonation of pyridyl-substituted TTF derivatives: substituent effects in solution and in the proton-electron correlated charge-transfer complexes.

Lee SC, Ueda A, Nakao A, Kumai R, Nakao H, Murakami Y, Mori H.

Chemistry. 2014 Feb 10;20(7):1909-17. doi: 10.1002/chem.201302614. Epub 2014 Jan 15.

PMID:
24431148
26.

Polarization switching ability dependent on multidomain topology in a uniaxial organic ferroelectric.

Kagawa F, Horiuchi S, Minami N, Ishibashi S, Kobayashi K, Kumai R, Murakami Y, Tokura Y.

Nano Lett. 2014 Jan 8;14(1):239-43. doi: 10.1021/nl403828u. Epub 2013 Dec 12.

PMID:
24329117
27.

Spin-orbital superstructure in strained ferrimagnetic perovskite cobalt oxide.

Fujioka J, Yamasaki Y, Nakao H, Kumai R, Murakami Y, Nakamura M, Kawasaki M, Tokura Y.

Phys Rev Lett. 2013 Jul 12;111(2):027206. Epub 2013 Jul 9.

PMID:
23889438
28.

High-temperature and pressure-induced ferroelectricity in hydrogen-bonded supramolecular crystals of anilic acids and 2,3-di(2-pyridinyl)pyrazine.

Horiuchi S, Kumai R, Tokura Y.

J Am Chem Soc. 2013 Mar 20;135(11):4492-500. doi: 10.1021/ja400318v. Epub 2013 Mar 11.

PMID:
23448384
29.

Hydrogen bond-promoted metallic state in a purely organic single-component conductor under pressure.

Isono T, Kamo H, Ueda A, Takahashi K, Nakao A, Kumai R, Nakao H, Kobayashi K, Murakami Y, Mori H.

Nat Commun. 2013;4:1344. doi: 10.1038/ncomms2352.

PMID:
23299894
30.

Above-room-temperature ferroelectricity and antiferroelectricity in benzimidazoles.

Horiuchi S, Kagawa F, Hatahara K, Kobayashi K, Kumai R, Murakami Y, Tokura Y.

Nat Commun. 2012;3:1308. doi: 10.1038/ncomms2322.

31.

Simple push coating of polymer thin-film transistors.

Ikawa M, Yamada T, Matsui H, Minemawari H, Tsutsumi J, Horii Y, Chikamatsu M, Azumi R, Kumai R, Hasegawa T.

Nat Commun. 2012;3:1176. doi: 10.1038/ncomms2190.

32.

Three-way switching in a cyanide-bridged [CoFe] chain.

Hoshino N, Iijima F, Newton GN, Yoshida N, Shiga T, Nojiri H, Nakao A, Kumai R, Murakami Y, Oshio H.

Nat Chem. 2012 Nov;4(11):921-6. doi: 10.1038/nchem.1455. Epub 2012 Sep 16.

PMID:
23089867
33.

Electronic ferroelectricity in a molecular crystal with large polarization directing antiparallel to ionic displacement.

Kobayashi K, Horiuchi S, Kumai R, Kagawa F, Murakami Y, Tokura Y.

Phys Rev Lett. 2012 Jun 8;108(23):237601. Epub 2012 Jun 4.

PMID:
23003988
34.

Charge-order driven proton arrangement in a hydrogen-bonded charge-transfer complex based on a pyridyl-substituted TTF derivative.

Lee SC, Ueda A, Kamo H, Takahashi K, Uruichi M, Yamamoto K, Yakushi K, Nakao A, Kumai R, Kobayashi K, Nakao H, Murakami Y, Mori H.

Chem Commun (Camb). 2012 Sep 7;48(69):8673-5. doi: 10.1039/c2cc34296k. Epub 2012 Jul 23.

PMID:
22820668
35.

Ferroelectricity and pressure-induced phenomena driven by neutral ionic valence instability of acid-base supramolecules.

Kumai R, Horiuchi S, Fujioka J, Tokura Y.

J Am Chem Soc. 2012 Jan 18;134(2):1036-46. doi: 10.1021/ja208113p. Epub 2012 Jan 5.

PMID:
22142304
36.

Inkjet printing of single-crystal films.

Minemawari H, Yamada T, Matsui H, Tsutsumi J, Haas S, Chiba R, Kumai R, Hasegawa T.

Nature. 2011 Jul 13;475(7356):364-7. doi: 10.1038/nature10313.

PMID:
21753752
37.

Giant Rashba-type spin splitting in bulk BiTeI.

Ishizaka K, Bahramy MS, Murakawa H, Sakano M, Shimojima T, Sonobe T, Koizumi K, Shin S, Miyahara H, Kimura A, Miyamoto K, Okuda T, Namatame H, Taniguchi M, Arita R, Nagaosa N, Kobayashi K, Murakami Y, Kumai R, Kaneko Y, Onose Y, Tokura Y.

Nat Mater. 2011 Jun 19;10(7):521-6. doi: 10.1038/nmat3051.

PMID:
21685900
38.

Hydrogen-bonding molecular chains for high-temperature ferroelectricity.

Horiuchi S, Kumai R, Tokura Y.

Adv Mater. 2011 May 10;23(18):2098-103. doi: 10.1002/adma.201100359. Epub 2011 Apr 4. No abstract available.

PMID:
21462375
39.

Pseudogap of metallic layered nickelate R(2-x)Sr(x)NiO4 (R = Nd, Eu) crystals measured using angle-resolved photoemission spectroscopy.

Uchida M, Ishizaka K, Hansmann P, Kaneko Y, Ishida Y, Yang X, Kumai R, Toschi A, Onose Y, Arita R, Held K, Andersen OK, Shin S, Tokura Y.

Phys Rev Lett. 2011 Jan 14;106(2):027001. Epub 2011 Jan 12.

PMID:
21405246
40.

Electric-field control of solitons in a ferroelectric organic charge-transfer salt.

Kagawa F, Horiuchi S, Matsui H, Kumai R, Onose Y, Hasegawa T, Tokura Y.

Phys Rev Lett. 2010 Jun 4;104(22):227602. Epub 2010 Jun 2.

PMID:
20867204
41.

Magnetically tunable metal-insulator superlattices.

Nakamura M, Okuyama D, Lee JS, Arima TH, Wakabayashi Y, Kumai R, Kawasaki M, Tokura Y.

Adv Mater. 2010 Jan 26;22(4):500-4. doi: 10.1002/adma.200902734. No abstract available.

PMID:
20217742
42.

Above-room-temperature ferroelectricity in a single-component molecular crystal.

Horiuchi S, Tokunaga Y, Giovannetti G, Picozzi S, Itoh H, Shimano R, Kumai R, Tokura Y.

Nature. 2010 Feb 11;463(7282):789-92. doi: 10.1038/nature08731. Erratum in: Nature. 2010 Aug 19;466(7309):1006.

PMID:
20148035
43.

Ferroelectricity and polarity control in solid-state flip-flop supramolecular rotators.

Akutagawa T, Koshinaka H, Sato D, Takeda S, Noro S, Takahashi H, Kumai R, Tokura Y, Nakamura T.

Nat Mater. 2009 Apr;8(4):342-7. doi: 10.1038/nmat2377. Epub 2009 Feb 8.

PMID:
19202547
44.

Proton dynamics and room-temperature ferroelectricity in anilate salts with a proton sponge.

Horiuchi S, Kumai R, Tokunaga Y, Tokura Y.

J Am Chem Soc. 2008 Oct 8;130(40):13382-91. doi: 10.1021/ja8032235. Epub 2008 Sep 10.

PMID:
18781747
45.

Magnetic field switching between the two orbital-ordered states in DyVO3.

Miyasaka S, Yasue T, Fujioka J, Yamasaki Y, Okimoto Y, Kumai R, Arima T, Tokura Y.

Phys Rev Lett. 2007 Nov 23;99(21):217201. Epub 2007 Nov 19.

PMID:
18233244
46.

Structural assignment of polarization in hydrogen-bonded supramolecular ferroelectrics.

Kumai R, Horiuchi S, Sagayama H, Arima TH, Watanabe M, Noda Y, Tokura Y.

J Am Chem Soc. 2007 Oct 31;129(43):12920-1. Epub 2007 Oct 9. No abstract available.

PMID:
17924632
47.

Hydrogen-bonded donor--acceptor compounds for organic ferroelectric materials.

Horiuchi S, Kumai R, Tokura Y.

Chem Commun (Camb). 2007 Jun 21;(23):2321-9.

PMID:
17844735
48.

A supramolecular ferroelectric realized by collective proton transfer.

Horiuchi S, Kumai R, Tokura Y.

Angew Chem Int Ed Engl. 2007;46(19):3497-501. No abstract available.

PMID:
17397017
49.

Rotation of orbital stripes and the consequent charge-polarized state in bilayer manganites.

Tokunaga Y, Lottermoser T, Lee Y, Kumai R, Uchida M, Arima T, Tokura Y.

Nat Mater. 2006 Dec;5(12):937-41. Epub 2006 Nov 5.

PMID:
17086170
50.

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