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  • 11
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    Antiferroquadrupolar Ordering in a Pr-Based Superconductor PrIr_{2} Zn_{20} (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-04-30
    Description: Author(s): T. Onimaru, K. T. Matsumoto, Y. F. Inoue, K. Umeo, T. Sakakibara, Y. Karaki, M. Kubota, and T. Takabatake An antiferroquadrupolar ordering at T_{Q} =0.11  K has been found in a Pr-based superconductor PrIr_{2} Zn_{20} . The measurements of specific heat and magnetization revealed the non-Kramers Γ_{3} doublet ground state with the quadrupolar degrees of freedom. The specific heat exhibits a sharp p... [Phys. Rev. Lett. 106, 177001] Published Fri Apr 29, 2011
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 12
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    Spin-Chirality-Driven Ferroelectricity on a Perfect Triangular Lattice Antiferromagnet (2014)
    American Physical Society (APS)
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    Publication Date: 2014-10-02
    Description: Author(s): H. Mitamura, R. Watanuki, K. Kaneko, N. Onozaki, Y. Amou, S. Kittaka, R. Kobayashi, Y. Shimura, I. Yamamoto, K. Suzuki, S. Chi, and T. Sakakibara Magnetic field (B) variation of the electrical polarization Pc (∥c) of the perfect triangular lattice antiferromagnet RbFe(MoO4)2 is examined up to the saturation point of the magnetization for B⊥c. Pc is observed only in phases for which chirality is predicted in the in-plane magnetic structures. N... [Phys. Rev. Lett. 113, 147202] Published Wed Oct 01, 2014
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 13
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    Time-reversal symmetry breaking and spontaneous Hall effect without magnetic dipole order (2009)
    Nature Publishing Group (NPG)
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    Publication Date: 2009-12-17
    Description: Spin liquids are magnetically frustrated systems, in which spins are prevented from ordering or freezing, owing to quantum or thermal fluctuations among degenerate states induced by the frustration. Chiral spin liquids are a hypothetical class of spin liquids in which the time-reversal symmetry is macroscopically broken in the absence of an applied magnetic field or any magnetic dipole long-range order. Even though such chiral spin-liquid states were proposed more than two decades ago, an experimental realization and observation of such states has remained a challenge. One of the characteristic order parameters in such systems is a macroscopic average of the scalar spin chirality, a solid angle subtended by three nearby spins. In previous experimental reports, however, the spin chirality was only parasitic to the non-coplanar spin structure associated with a magnetic dipole long-range order or induced by the applied magnetic field, and thus the chiral spin-liquid state has never been found. Here, we report empirical evidence that the time-reversal symmetry can be broken spontaneously on a macroscopic scale in the absence of magnetic dipole long-range order. In particular, we employ the anomalous Hall effect to directly probe the broken time-reversal symmetry for the metallic frustrated magnet Pr(2)Ir(2)O(7). An onset of the Hall effect is observed at zero field in the absence of uniform magnetization, within the experimental accuracy, suggesting an emergence of a chiral spin liquid. The origin of this spontaneous Hall effect is ascribed to chiral spin textures, which are inferred from the magnetic measurements indicating the spin ice-rule formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Machida, Yo -- Nakatsuji, Satoru -- Onoda, Shigeki -- Tayama, Takashi -- Sakakibara, Toshiro -- England -- Nature. 2010 Jan 14;463(7278):210-3. doi: 10.1038/nature08680. Epub 2009 Dec 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉[1] Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan [2] Present addresses: Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan (Y.M.); Department of Physics, University of Toyama, Toyama 930-8555, Japan (T.T.).〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20010605" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 14
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    Field-induced quantum magnetism in the verdazyl-based charge-transfer salt $[o\text{−}\mathrm{MePy}\text{−}\mathrm{V}\text{−}{(p\text{−}\mathrm{Br})}_{2}]{\mathrm{FeCl}}_{4}$ (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-12-08
    Description: Author(s): Y. Iwasaki, T. Kida, M. Hagiwara, T. Kawakami, Y. Kono, S. Kittaka, T. Sakakibara, Y. Hosokoshi, and H. Yamaguchi We successfully synthesized a verdazyl-based charge-transfer salt [ o − MePy − V − ( p − Br ) 2 ] FeCl 4 , which has S V = 1 / 2 on the radical o − MePy − V − ( p − Br ) 2 and S Fe = 5 / 2 on the FeCl 4 anion. Ab initio molecular orbital calculations indicate the formation of an S V = 1 / 2 honeycomb lattice composed of three types of exchan... [Phys. Rev. B 98, 224411] Published Fri Dec 07, 2018
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 15
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    Field-enhanced quantum fluctuation in an $S=\frac{1}{2}$ frustrated square lattice (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-09-05
    Description: Author(s): H. Yamaguchi, Y. Sasaki, T. Okubo, M. Yoshida, T. Kida, M. Hagiwara, Y. Kono, S. Kittaka, T. Sakakibara, M. Takigawa, Y. Iwasaki, and Y. Hosokoshi We present a new model compound with the S = 1 / 2 frustrated square lattice composed of the charge-transfer salt ( o -MePy-V) PF 6 . A b i n i t i o calculations indicate the formation of an S = 1 / 2 square lattice, in which six types of nearest-neighbor ferromagnetic and antiferromagnetic interactions cause frustrat... [Phys. Rev. B 98, 094402] Published Tue Sep 04, 2018
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 16
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    Defensin-like polypeptide LUREs are pollen tube attractants secreted from synergid cells (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-03-20
    Description: For more than 140 years, pollen tube guidance in flowering plants has been thought to be mediated by chemoattractants derived from target ovules. However, there has been no convincing evidence of any particular molecule being the true attractant that actually controls the navigation of pollen tubes towards ovules. Emerging data indicate that two synergid cells on the side of the egg cell emit a diffusible, species-specific signal to attract the pollen tube at the last step of pollen tube guidance. Here we report that secreted, cysteine-rich polypeptides (CRPs) in a subgroup of defensin-like proteins are attractants derived from the synergid cells. We isolated synergid cells of Torenia fournieri, a unique plant with a protruding embryo sac, to identify transcripts encoding secreted proteins as candidate molecules for the chemoattractant(s). We found two CRPs, abundantly and predominantly expressed in the synergid cell, which are secreted to the surface of the egg apparatus. Moreover, they showed activity in vitro to attract competent pollen tubes of their own species and were named as LUREs. Injection of morpholino antisense oligomers against the LUREs impaired pollen tube attraction, supporting the finding that LUREs are the attractants derived from the synergid cells of T. fournieri.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Okuda, Satohiro -- Tsutsui, Hiroki -- Shiina, Keiko -- Sprunck, Stefanie -- Takeuchi, Hidenori -- Yui, Ryoko -- Kasahara, Ryushiro D -- Hamamura, Yuki -- Mizukami, Akane -- Susaki, Daichi -- Kawano, Nao -- Sakakibara, Takashi -- Namiki, Shoko -- Itoh, Kie -- Otsuka, Kurataka -- Matsuzaki, Motomichi -- Nozaki, Hisayoshi -- Kuroiwa, Tsuneyoshi -- Nakano, Akihiko -- Kanaoka, Masahiro M -- Dresselhaus, Thomas -- Sasaki, Narie -- Higashiyama, Tetsuya -- England -- Nature. 2009 Mar 19;458(7236):357-61. doi: 10.1038/nature07882.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biological Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19295610" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Angiosperms/*cytology/drug effects/genetics/*growth & development ; Chemotactic Factors/chemistry/*metabolism/pharmacology/*secretion ; Defensins/chemistry/*metabolism/pharmacology/*secretion ; Expressed Sequence Tags ; Molecular Sequence Data ; Oligonucleotides, Antisense/genetics ; Pollen Tube/drug effects/genetics/*growth & development ; RNA, Plant/antagonists & inhibitors/genetics/metabolism ; Transcription, Genetic
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 17
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    Quantum criticality without tuning in the mixed valence compound beta-YbAlB4 (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-01-22
    Description: Fermi liquid theory, the standard theory of metals, has been challenged by a number of observations of anomalous metallic behavior found in the vicinity of a quantum phase transition. The breakdown of the Fermi liquid is accomplished by fine-tuning the material to a quantum critical point by using a control parameter such as the magnetic field, pressure, or chemical composition. Our high-precision magnetization measurements of the ultrapure f-electron-based superconductor beta-YbAlB(4) demonstrate a scaling of its free energy that is indicative of zero-field quantum criticality without tuning in a metal. The breakdown of Fermi liquid behavior takes place in a mixed-valence state, which is in sharp contrast with other known examples of quantum critical f-electron systems that are magnetic Kondo lattice systems with integral valence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Matsumoto, Yosuke -- Nakatsuji, Satoru -- Kuga, Kentaro -- Karaki, Yoshitomo -- Horie, Naoki -- Shimura, Yasuyuki -- Sakakibara, Toshiro -- Nevidomskyy, Andriy H -- Coleman, Piers -- New York, N.Y. -- Science. 2011 Jan 21;331(6015):316-9. doi: 10.1126/science.1197531.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21252341" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 18
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    Disorder-sensitive phase formation linked to metamagnetic quantum criticality (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-11-13
    Description: Condensed systems of strongly interacting electrons are ideal for the study of quantum complexity. It has become possible to promote the formation of new quantum phases by explicitly tuning systems toward special low-temperature quantum critical points. So far, the clearest examples have been appearances of superconductivity near pressure-tuned antiferromagnetic quantum critical points. We present experimental evidence for the formation of a nonsuperconducting phase in the vicinity of a magnetic field-tuned quantum critical point in ultrapure crystals of the ruthenate metal Sr3Ru2O7, and we discuss the possibility that the observed phase is due to a spin-dependent symmetry-breaking Fermi surface distortion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grigera, S A -- Gegenwart, P -- Borzi, R A -- Weickert, F -- Schofield, A J -- Perry, R S -- Tayama, T -- Sakakibara, T -- Maeno, Y -- Green, A G -- Mackenzie, A P -- New York, N.Y. -- Science. 2004 Nov 12;306(5699):1154-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, Scotland. sag2@st-and.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15539596" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 19
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    Metamagnetic crossover in the quasikagome Ising Kondo-lattice compound CeIrSn (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-10-30
    Description: Author(s): S. Tsuda, C. L. Yang, Y. Shimura, K. Umeo, H. Fukuoka, Y. Yamane, T. Onimaru, T. Takabatake, N. Kikugawa, T. Terashima, H. T. Hirose, S. Uji, S. Kittaka, and T. Sakakibara The Ce atoms in CeIrSn form a quasikagome lattice in the hexagonal c plane. Our single-crystal x-ray diffraction analysis has confirmed the absence of superstructure in the ZrNiAl-type structure. Motivated by the recent observation of quantum critical behaviors in the isostructural and isoelectronic... [Phys. Rev. B 98, 155147] Published Mon Oct 29, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 20
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    Various regimes of quantum behavior in an S=1/2 Heisenberg antiferromagnetic chain with fourfold periodicity (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-11-16
    Description: Author(s): H. Yamaguchi, T. Okubo, K. Iwase, T. Ono, Y. Kono, S. Kittaka, T. Sakakibara, A. Matsuo, K. Kindo, and Y. Hosokoshi We have succeeded in synthesizing single crystals of the verdazyl radical β -3-(2,6-dichlorophenyl)-1,5-diphenylverdazyl. The a b i n i t i o molecular orbital calculation indicates the formation of an S =1/2 Heisenberg antiferromagnetic chain with fourfold magnetic periodicity consisting of three types of ... [Phys. Rev. B 88, 174410] Published Fri Nov 15, 2013
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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