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Carlos Córdova-Fletes, Horacio Rivera, Eduardo A Garza-Villarreal, Norma A Vázquéz-Cárdenas, Lizeth A Martínez-Jacobo, Talia Moreno-Andrade
No abstract text is available yet for this article.
October 12, 2016: Clinical Dysmorphology
H Gretarsson, N H Sung, J Porras, J Bertinshaw, C Dietl, Jan A N Bruin, A F Bangura, Y K Kim, R Dinnebier, Jungho Kim, A Al-Zein, M Moretti Sala, M Krisch, M Le Tacon, B Keimer, B J Kim
We have studied the magnetic excitations of electron-doped Sr_{2-x}La_{x}IrO_{4} (0≤x≤0.10) using resonant inelastic x-ray scattering at the Ir L_{3} edge. The long-range magnetic order is rapidly lost with increasing x, but two-dimensional short-range order (SRO) and dispersive magnon excitations with nearly undiminished spectral weight persist well into the metallic part of the phase diagram. The magnons in the SRO phase are heavily damped and exhibit anisotropic softening. Their dispersions are well described by a pseudospin-1/2 Heisenberg model with exchange interactions whose spatial range increases with doping...
September 2, 2016: Physical Review Letters
Vianney Cortés-González, Juan Carlos Zenteno, Martín Guzmán-Sánchez, Verónica Giordano-Herrera, Dalia Guadarrama-Vallejo, Narlly Ruíz-Quintero, Cristina Villanueva-Mendoza
Tietz syndrome and Waardenburg syndrome type 2A are allelic conditions caused by MITF mutations. Tietz syndrome is inherited in an autosomal dominant pattern and is characterized by congenital deafness and generalized skin, hair, and eye hypopigmentation, while Waardenburg syndrome type 2A typically includes variable degrees of sensorineural hearing loss and patches of de-pigmented skin, hair, and irides. In this paper, we report two unrelated families with MITF mutations. The first family showed an autosomal dominant pattern and variable expressivity...
September 8, 2016: American Journal of Medical Genetics. Part A
John Nichols, Xiang Gao, Shinbuhm Lee, Tricia L Meyer, John W Freeland, Valeria Lauter, Di Yi, Jian Liu, Daniel Haskel, Jonathan R Petrie, Er-Jia Guo, Andreas Herklotz, Dongkyu Lee, Thomas Z Ward, Gyula Eres, Michael R Fitzsimmons, Ho Nyung Lee
Strong Coulomb repulsion and spin-orbit coupling are known to give rise to exotic physical phenomena in transition metal oxides. Initial attempts to investigate systems, where both of these fundamental interactions are comparably strong, such as 3d and 5d complex oxide superlattices, have revealed properties that only slightly differ from the bulk ones of the constituent materials. Here we observe that the interfacial coupling between the 3d antiferromagnetic insulator SrMnO3 and the 5d paramagnetic metal SrIrO3 is enormously strong, yielding an anomalous Hall response as the result of charge transfer driven interfacial ferromagnetism...
2016: Nature Communications
Giuseppe di Mauro, Roberto Bernardini, Salvatore Barberi, Annalisa Capuano, Antonio Correra, Gian Luigi De' Angelis, Iride Dello Iacono, Maurizio de Martino, Daniele Ghiglioni, Dora Di Mauro, Marcello Giovannini, Massimo Landi, Gian Luigi Marseglia, Alberto Martelli, Vito Leonardo Miniello, Diego Peroni, Lucilla Ricottini Maria Giuseppa Sullo, Luigi Terracciano, Cristina Vascone, Elvira Verduci, Maria Carmen Verga, Elena Chiappini
BACKGROUND: Allergic sensitization in children and allergic diseases arising therefrom are increasing for decades. Several interventions, functional foods, pro- and prebiotics, vitamins are proposed for the prevention of allergies and they can't be uncritically adopted. OBJECTIVE: This Consensus document was developed by the Italian Society of Preventive and Social Paediatrics and the Italian Society of Paediatric Allergy and Immunology. The aim is to provide updated recommendations regarding allergy prevention in children...
2016: World Allergy Organization Journal
Kasper S Pedersen, Jesper Bendix, Alain Tressaud, Etienne Durand, Høgni Weihe, Zaher Salman, Thorbjørn J Morsing, Daniel N Woodruff, Yanhua Lan, Wolfgang Wernsdorfer, Corine Mathonière, Stergios Piligkos, Sophia I Klokishner, Serghei Ostrovsky, Katharina Ollefs, Fabrice Wilhelm, Andrei Rogalev, Rodolphe Clérac
No abstract text is available yet for this article.
2016: Nature Communications
Robert Schaffer, Eric Kin-Ho Lee, Bohm-Jung Yang, Yong Baek Kim
The emergence of novel quantum ground states in correlated electron systems with strong spin-orbit coupling has been a recent subject of intensive studies. While it has been realized that spin-orbit coupling can provide non-trivial band topology in weakly interacting electron systems, as in topological insulators and semi-metals, the role of electron-electron interaction in strongly spin-orbit coupled systems has not been fully understood. The availability of new materials with significant electron correlation and strong spin-orbit coupling now makes such investigations possible...
September 2016: Reports on Progress in Physics
Katharina Fleck, Georg Erhardt, Gesine Lühken
Leucism is characterized by a complete or partial white skin and hair in combination with pigmented irides, which can be vivid blue or heterochromatic. This is due to a complete or partial lack of melanocytes. The underlying pathogenesis is a disturbed emigration or differentiation of neural crest-derived cells. Therefore, leucistic phenotypes can be associated with defects, which mainly impair sensory organs and nerves. In humans, a well-known example is the Waardenburg syndrome. Leucism-associated disorders were also described in mouse, rat, hamster, rabbit, mink, cat, dog, pig, sheep, llama, alpaca, cattle and horse...
July 2016: Berliner und Münchener Tierärztliche Wochenschrift
Jacqueline Chua, Sri Gowtham Thakku, Tin A Tun, Monisha E Nongpiur, Marcus Chiang Lee Tan, Michael J A Girard, Tien Yin Wong, Joanne Hui Min Quah, Tin Aung, Ching-Yu Cheng
PURPOSE: To determine the association of iris surface features with iris volume change after physiologic pupil dilation in adults. DESIGN: Cross-sectional observational study. PARTICIPANTS: Chinese adults aged ≥ 50 years without ocular diseases. METHODS: Digital iris photographs were taken from eyes of each participant and graded for crypts (by number and size) and furrows (by number and circumferential extent) following a standardized grading scheme...
October 2016: Ophthalmology
M Nakayama, Takeshi Kondo, Z Tian, J J Ishikawa, M Halim, C Bareille, W Malaeb, K Kuroda, T Tomita, S Ideta, K Tanaka, M Matsunami, S Kimura, N Inami, K Ono, H Kumigashira, L Balents, S Nakatsuji, S Shin
We present an angle-resolved photoemission study of the electronic structure of the three-dimensional pyrochlore iridate Nd_{2}Ir_{2}O_{7} through its magnetic metal-insulator transition. Our data reveal that metallic Nd_{2}Ir_{2}O_{7} has a quadratic band, touching the Fermi level at the Γ point, similar to that of Pr_{2}Ir_{2}O_{7}. The Fermi node state is, therefore, a common feature of the metallic phase of the pyrochlore iridates. Upon cooling below the transition temperature, this compound exhibits a gap opening with an energy shift of quasiparticle peaks like a band gap insulator...
July 29, 2016: Physical Review Letters
C Donnerer, M C Rahn, M Moretti Sala, J G Vale, D Pincini, J Strempfer, M Krisch, D Prabhakaran, A T Boothroyd, D F McMorrow
Using resonant magnetic x-ray scattering we address the unresolved nature of the magnetic ground state and the low-energy effective Hamiltonian of Sm_{2}Ir_{2}O_{7}, a prototypical pyrochlore iridate with a finite temperature metal-insulator transition. Through a combination of elastic and inelastic measurements, we show that the magnetic ground state is an all-in-all-out (AIAO) antiferromagnet. The magnon dispersion indicates significant electronic correlations and can be well described by a minimal Hamiltonian that includes Heisenberg exchange [J=27...
July 15, 2016: Physical Review Letters
Z T Liu, M Y Li, Q F Li, J S Liu, W Li, H F Yang, Q Yao, C C Fan, X G Wan, Z Wang, D W Shen
Perovskite SrIrO3 has long been proposed as an exotic semimetal induced by the interplay between the spin-orbit coupling and electron correlations. However, its low-lying electronic structure is still lacking. We synthesize high-quality perovskite SrIrO3 (100) films by means of oxide molecular beam epitaxy, and then systemically investigate their low energy electronic structure using in-situ angle-resolved photoemission spectroscopy. We find that the hole-like bands around R and the electron-like bands around U(T) intersect the Fermi level simultaneously, providing the direct evidence of the semimetallic ground state in this compound...
2016: Scientific Reports
A Glamazda, P Lemmens, S-H Do, Y S Choi, K-Y Choi
The fractionalization of elementary excitations in quantum spin systems is a central theme in current condensed matter physics. The Kitaev honeycomb spin model provides a prominent example of exotic fractionalized quasiparticles, composed of itinerant Majorana fermions and gapped gauge fluxes. However, identification of the Majorana fermions in a three-dimensional honeycomb lattice remains elusive. Here we report spectroscopic signatures of fractional excitations in the harmonic-honeycomb iridates β- and γ-Li2IrO3...
2016: Nature Communications
Kasper S Pedersen, Jesper Bendix, Alain Tressaud, Etienne Durand, Høgni Weihe, Zaher Salman, Thorbjørn J Morsing, Daniel N Woodruff, Yanhua Lan, Wolfgang Wernsdorfer, Corine Mathonière, Stergios Piligkos, Sophia I Klokishner, Serghei Ostrovsky, Katharina Ollefs, Fabrice Wilhelm, Andrei Rogalev, Rodolphe Clérac
New exotic phenomena have recently been discovered in oxides of paramagnetic Ir(4+) ions, widely known as 'iridates'. Their remarkable properties originate from concerted effects of the crystal field, magnetic interactions and strong spin-orbit coupling, characteristic of 5d metal ions. Despite numerous experimental reports, the electronic structure of these materials is still challenging to elucidate, and not attainable in the isolated, but chemically inaccessible, [IrO6](8-) species (the simplest molecular analogue of the elementary {IrO6}(8-) fragment present in all iridates)...
2016: Nature Communications
L C Boberg-Ans, I C Munch, M Larsen, B Gopinath, J J Wang, P Mitchell
PURPOSE: To investigate the epidemiology of Gunn's dots and their associations in a population-based cohort of children. METHODS: Red-free fundus photographs from 2,286 children aged 11 years to 14 years from the Sydney Myopia Study were graded. Gunn's dots were manually marked and counted within a 6 mm grid centered on the optic disc. RESULTS: One or more Gunn's dots were seen in at least one eye in 82.6% of children. The median number of Gunn's dots per eye was 46 (range 0-482)...
July 14, 2016: Retina
Kyusung Hwang, Yong Baek Kim
We theoretically investigate emergent quantum phases in the thin film geometries of the pyrochore iridates, where a number of exotic quantum ground states are proposed to occur in bulk materials as a result of the interplay between electron correlation and strong spin-orbit coupling. The fate of these bulk phases as well as novel quantum states that may arise only in the thin film platforms, are studied via a theoretical model that allows layer-dependent magnetic structures. It is found that the magnetic order develop in inhomogeneous fashions in the thin film geometries...
2016: Scientific Reports
Vamshi M Katukuri, Ravi Yadav, Liviu Hozoi, Satoshi Nishimoto, Jeroen van den Brink
Due to the combination of a substantial spin-orbit coupling and correlation effects, iridium oxides hold a prominent place in the search for novel quantum states of matter, including, e.g., Kitaev spin liquids and topological Weyl states. We establish the promise of the very recently synthesized hyper-honeycomb iridate β-Li2IrO3 in this regard. A detailed theoretical analysis reveals the presence of large ferromagnetic first-neighbor Kitaev interactions, while a second-neighbor antiferromagnetic Heisenberg exchange drives the ground state from ferro to zigzag order via a three-dimensional Kitaev spin liquid and an incommensurate phase...
2016: Scientific Reports
A-S Debue, N Kentish-Barnes, G Christine, A Gressent, F Iride, C Bridey, S Calvino-Gunther, S Cosserant, S Renard, C Brossard, E Pichot, B Megarbane, K Klouche, D Flattres-Duchaussoy, C Leroy, C Bigot, B Floccard, J D Chiche
No abstract text is available yet for this article.
December 2015: Intensive Care Medicine Experimental
A S Debue, N Kentish-Barnes, G Christine, A Gressent, F Iride, C Bridey, S Calvino-Gunther, S Cosserant, S Renard, C Brossard, E Pichot, B Megarbane, K Klouche, D Flattres-Duchaussoy, C Leroy, C Bigot, B Floccard, J D Chiche
No abstract text is available yet for this article.
December 2015: Intensive Care Medicine Experimental
S Calder, J G Vale, N A Bogdanov, X Liu, C Donnerer, M H Upton, D Casa, A H Said, M D Lumsden, Z Zhao, J-Q Yan, D Mandrus, S Nishimoto, J van den Brink, J P Hill, D F McMorrow, A D Christianson
Much consideration has been given to the role of spin-orbit coupling (SOC) in 5d oxides, particularly on the formation of novel electronic states and manifested metal-insulator transitions (MITs). SOC plays a dominant role in 5d(5) iridates (Ir(4+)), undergoing MITs both concurrent (pyrochlores) and separated (perovskites) from the onset of magnetic order. However, the role of SOC for other 5d configurations is less clear. For example, 5d(3) (Os(5+)) systems are expected to have an orbital singlet with reduced effective SOC...
2016: Nature Communications
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