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Gitgeatpong G, Zhao Y, Piyawongwatthana P, Qiu Y, Harriger LW, Butch NP, Sato TJ, Matan K. Nonreciprocal Magnons and Symmetry-Breaking in the Noncentrosymmetric Antiferromagnet. Phys Rev Lett 2017; 119:047201. [PMID: 29341758 DOI: 10.1103/physrevlett.119.047201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Indexed: 06/07/2023]
Abstract
Inelastic neutron scattering measurements were performed to study spin dynamics in the noncentrosymmetric antiferromagnet α-Cu_{2}V_{2}O_{7}. For the first time, nonreciprocal magnons were experimentally measured in an antiferromagnet. These nonreciprocal magnons are caused by the incompatibility between anisotropic exchange and antisymmetric Dzyaloshinskii-Moriya interactions, which arise from broken symmetry, resulting in a collinear ordered state but helical spin dynamics. The nonreciprocity introduces the difference in the phase velocity of the counterrotating modes, causing the opposite spontaneous magnonic Faraday rotation of the left- and right-propagating spin waves. The breaking of spatial inversion and time reversal symmetry is revealed as a magnetic-field-induced asymmetric energy shift, which provides a test for the detailed balance relation.
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Affiliation(s)
- G Gitgeatpong
- Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
- ThEP, Commission of Higher Education, Bangkok 10400, Thailand
- Department of Physics, Faculty of Science and Technology, Phranakhon Rajabhat University, Bangkok 10220, Thailand
| | - Y Zhao
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - P Piyawongwatthana
- Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Y Qiu
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - L W Harriger
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - N P Butch
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - T J Sato
- IMRAM, Tohoku University, Sendai, Miyagi 980-8577, Japan
| | - K Matan
- Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
- ThEP, Commission of Higher Education, Bangkok 10400, Thailand
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Kinoshita M, Seki S, Sato TJ, Nambu Y, Hong T, Matsuda M, Cao HB, Ishiwata S, Tokura Y. Magnetic Reversal of Electric Polarization with Fixed Chirality of Magnetic Structure in a Chiral-Lattice Helimagnet MnSb_{2}O_{6}. Phys Rev Lett 2016; 117:047201. [PMID: 27494497 DOI: 10.1103/physrevlett.117.047201] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Indexed: 06/06/2023]
Abstract
The correlation between magnetic and dielectric properties has been investigated for the single crystal of the chiral triangular-lattice helimagnet MnSb_{2}O_{6}. We found that the spin-spiral plane in the ground state has a considerable tilting from the (110) plane and that the sign of the spin-spiral tilting angle is coupled to the clockwise or counterclockwise manner of spin rotation and accordingly to the sign of magnetically induced electric polarization. This leads to unique magnetoelectric responses such as the magnetic-field-induced selection of a single ferroelectric domain as well as the reversal of electric polarization just by a slight tilting of the magnetic field direction, where the chiral nature of the crystal structure plays a crucial role through the coupling of the chirality between the crystal and magnetic structures. Our results demonstrate that crystallographic chirality can be an abundant source of novel magnetoelectric functions with coupled internal degrees of freedom.
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Affiliation(s)
- M Kinoshita
- Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
| | - S Seki
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- PRESTO, Japan Science and Technology Agency (JST), Tokyo 102-8666, Japan
| | - T J Sato
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Y Nambu
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - T Hong
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M Matsuda
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H B Cao
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S Ishiwata
- Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
- PRESTO, Japan Science and Technology Agency (JST), Tokyo 102-8666, Japan
| | - Y Tokura
- Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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Hacisalihoglu MY, Paris E, Joseph B, Simonelli L, Sato TJ, Mizokawa T, Saini NL. A study of temperature dependent local atomic displacements in a Ba(Fe(1-x)Co(x))2As2 superconductor. Phys Chem Chem Phys 2016; 18:9029-35. [PMID: 26966734 DOI: 10.1039/c5cp07985c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have studied the local structure of a Ba(Fe(1-x)Co(x))2As2 superconductor using temperature dependent extended X-ray absorption fine structure (EXAFS) measurements. Polarized EXAFS at the Fe K-edge on an optimally doped (x = 0.06) single crystal has permitted us to determine atomic displacements across the superconducting transition temperature (T(c)). The Fe-As bondlength hardly shows any change with temperature; however, the Fe-Fe sublattice reveals a sharp anomaly across T(c), indicated by a significant drop in mean square relative displacements, similar to the one known for cuprates and A15-type superconductors. We have also found a large atomic disorder around the substituted Co, revealed by polarized Co K-edge EXAFS measurements. The Co-Fe/Co bonds are more flexible than the Fe-Fe bonds with the As-height in Co-containing tetrahedra being larger than the one in FeAs4. The results suggest that the local Fe-Fe bondlength fluctuations and the atomic disorder in this sub-lattice should have some important role in the superconductivity of Ba(Fe(1-x)Co(x))2As2 pnictides.
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Affiliation(s)
- M Y Hacisalihoglu
- Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. le Aldo Moro 2, 00185 Roma, Italy. and Department of Physics, Recep Tayyip Erdogan University, 53100 Rize, Turkey and Department of Physics, Karadeniz Technical University, 61080 Trabzon, Turkey
| | - E Paris
- Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. le Aldo Moro 2, 00185 Roma, Italy. and Center for Life NanoScience@Sapienza, Istituto Italiano di Tecnologia, V. le Regina Elena 291, 00185 Rome, Italy
| | - B Joseph
- Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. le Aldo Moro 2, 00185 Roma, Italy. and Elettra, Sincrotrone Trieste, Strada Statale 14, Km 163.5, Basovizza, Trieste, Italy
| | - L Simonelli
- ALBA Synchrotron Light Facility, Crta. BP 1413, Km. 3.3, 08290 Cerdanyola del Vallés, Barcelona, Spain
| | - T J Sato
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
| | - T Mizokawa
- Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan
| | - N L Saini
- Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. le Aldo Moro 2, 00185 Roma, Italy.
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Yokoo T, Ohoyama K, Itoh S, Suzuki J, Nanbu M, Kaneko N, Iwasa K, Sato TJ, Kimura H, Ohkawara M. Construction of Polarized Inelastic Neutron Spectrometer in J-PARC. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1742-6596/502/1/012046] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Munakata K, Ishida H, Mathan K, Ibuka S, Sato TJ, Nishi M, Matsubayashi K, Uwatoko Y, Kagi H. Development of cubic anvil type high pressure apparatus for neutron scattering at low temperature. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311079359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Sudayama T, Wakisaka Y, Takubo K, Morinaga R, Sato TJ, Arita M, Namatame H, Taniguchi M, Mizokawa T. Band structure of the heavily-electron-doped FeAs-based Ba(Fe,Co)2As2 superconductor suppresses antiferromagnetic correlations. Phys Rev Lett 2010; 104:177002. [PMID: 20482128 DOI: 10.1103/physrevlett.104.177002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Indexed: 05/29/2023]
Abstract
In the heavily-electron-doped regime of the Ba(Fe,Co)2As2 superconductor, three hole bands at the zone center are observed and two of them reach the Fermi level. The larger hole pocket at the zone center is apparently nested with the smaller electron pocket around the zone corner. However, the (pi,0) Fermi surface reconstruction reported for the hole-doped case is absent in the heavily-electron-doped case. This observation shows that the apparent Fermi surface nesting alone is not enough to enhance the antiferromagnetic correlation as well as the superconducting transition temperature.
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Affiliation(s)
- T Sudayama
- Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
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Sato TJ, Yamamuro O, Hirota K, Shibayama M, Yoshizawa H, Itoh S, Watanabe S, Asami T, Kindo K, Uwatoko Y, Kanaya T. High-intensity and versatile chopper spectrometer project for J-PARC. J of Neutron Res 2008. [DOI: 10.1080/10238160903361082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kajimoto R, Nakajima K, Nakamura M, Osakabe T, Sato TJ, Arai M. Curved neutron guide of the cold neutron disk-chopper spectrometer at J-PARC. J of Neutron Res 2008. [DOI: 10.1080/10238160902819346] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Nakajima K, Nakamura M, Kajimoto R, Osakabe T, Kakurai K, Matsuda M, Metoki M, Wakimoto S, Sato TJ, Itoh S, Arai M, Yoshida K, Niita K. Cold-neutron disk-chopper spectrometer at J-PARC. J of Neutron Res 2007. [DOI: 10.1080/10238160601045722] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chung JH, Matsuda M, Lee SH, Kakurai K, Ueda H, Sato TJ, Takagi H, Hong KP, Park S. Statics and dynamics of incommensurate spin order in a geometrically frustrated antiferromagnet CdCr2O4. Phys Rev Lett 2005; 95:247204. [PMID: 16384420 DOI: 10.1103/physrevlett.95.247204] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2005] [Indexed: 05/05/2023]
Abstract
Using elastic and inelastic neutron scattering we show that a cubic spinel, CdCr2O4, undergoes an elongation along the c axis (c > a = b) at its spin-Peierls-like phase transition at T(N) = 7.8 K. The Néel phase (T < T(N)) has an incommensurate spin structure with a characteristic wave vector Q(M) = (0, delta,1) with delta approximately 0.09 and with spins lying on the ac plane. This is in stark contrast to another well-known Cr-based spinel, ZnCr2O4, that undergoes a c-axis contraction and a commensurate spin order. The magnetic excitation of the incommensurate Néel state has a weak anisotropy gap of 0.6 meV and it consists of at least three bands extending up to 5 meV.
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Affiliation(s)
- J-H Chung
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8552, USA
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Watanuki T, Machida A, Ikeda T, Aoki K, Kaneko H, Shobu T, Sato TJ, Tsai AP. Successive alternation of the propagation direction of the inner shell ordering by pressure in a Cd-Yb 1/1 approximant crystal. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305096625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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12
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Sato TJ, Lynn JW, Dabrowski B. Disorder-induced polaron formation in the magnetoresistive perovskite La0.54Ba0.46MnO3. Phys Rev Lett 2004; 93:267204. [PMID: 15698018 DOI: 10.1103/physrevlett.93.267204] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2004] [Indexed: 05/24/2023]
Abstract
Neutron studies of the effect of A-site chemical disorder on the ferromagnetic transition and spin dynamics for the magnetoresistive perovskite La0.54Ba0.46MnO3 are reported. The low temperature spin waves reveal that disorder reduces exchange interactions by only 9%. The development of a quasielastic peak in the spectrum below TC and long-time relaxation of the order parameter indicate that the transition is discontinuous in the disordered sample, while it appears continuous for the ordered sample. These results strongly suggest that chemical disorder lowers the energy for polaron formation in manganese perovskites, and is the origin of the dramatic 50 K reduction in TC.
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Affiliation(s)
- T J Sato
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, USA.
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Lee SH, Louca D, Ueda H, Park S, Sato TJ, Isobe M, Ueda Y, Rosenkranz S, Zschack P, Iñiguez J, Qiu Y, Osborn R. Orbital and Spin Chains in ZnV2O4. Phys Rev Lett 2004; 93:156407. [PMID: 15524915 DOI: 10.1103/physrevlett.93.156407] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2004] [Indexed: 05/24/2023]
Abstract
Our powder inelastic neutron scattering data indicate that ZnV2O4 is a system of spin chains that are three-dimensionally tangled in the cubic phase above 50 K due to randomly occupied t(2g) orbitals of V3+ (3d(2)) ions. Below 50 K in the tetragonal phase, the chains become straight due to antiferro-orbital ordering. This is evidenced by the characteristic wave vector dependence of the magnetic structure factor that changes from symmetric to asymmetric at the cubic-to-tetragonal transition.
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Affiliation(s)
- S-H Lee
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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Sato TJ, Takakura H, Tsai AP, Ohoyama K, Shibata K, Andersen KH. Magnetic diffuse scattering from Zn-Mg-RE and Cd-Mg-RE (RE: rare-earth) icosahedral quasicrystals. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302094163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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15
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Watanuki T, Sato TJ, Tsai AP, Shimomura O. Structural study of icosahedral Cd-Yb quasicrystal under high pressure up to 40 GPa. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302092188] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Takakura H, Yamamoto A, Shiono M, Sato TJ, Tsai AP. Low-density elimination method applied to quasicrystals. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302085471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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17
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Kanamura T, Murakami G, Hirai I, Hata F, Sato TJ, Kumon M, Nakajima Y. High dorsal drainage routes of Spiegel's lobe. J Hepatobiliary Pancreat Surg 2002; 8:549-56. [PMID: 11956907 DOI: 10.1007/s005340100024] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND/PURPOSE The venous drainage from Spiegel's lobe to the terminal portion of the hepatic veins has been described in the literature, but its morphology remains unclear. METHODS We examined 42 dissected liver specimens and 38 cast specimens. RESULTS In 8 of the 42 dissected liver specimens and 5 of the 38 cast specimens we found atypical but thick (over 3 mm) caudate veins that drained Spiegel's lobe and emptied into the terminal portion (along the most proximal 5-mm course) of the middle hepatic vein (MHV) or the inferior vena cava (IVC) near the MHV terminal (less than 10 mm from the MHV). We termed these the superior caudate vein. This vein ran upward between the caudate portal branches of the left and hilar bifurcation origins or through the territory of the left origin. The superior caudate vein, consistently coexisted with the typical vein(s). We also found several analogues of the superior caudate vein, such as the cranially shifted opening of the typical caudate vein and relatively thick proximal tributaries of the MHV from Spiegel's lobe. CONCLUSIONS Although the superior caudate vein, if present, seemed to have a large role in the venous drainage of the lobe, its incidence seemed to be too low for clinical relevance.
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Affiliation(s)
- T Kanamura
- First Department of Surgery, Nara Medical University, Kashiwara, Japan
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Kikuchi N, Murakami G, Kashiwa H, Homma K, Sato TJ, Ogino T. Morphometrical study of the arterial perforators of the deep inferior epigastric perforator flap. Surg Radiol Anat 2002; 23:375-81. [PMID: 11963619 DOI: 10.1007/s00276-001-0375-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Although abdominal perforator flaps based on a cutaneous branch of the deep inferior epigastric artery (DIEP flaps) have many advantages, preparing these flaps is technically difficult and requires great skill, especially as the portion of the artery running under the anterior rectus abdominis sheath must be operated upon "blind". To allow easier preparation and elevation of a DIEP flap pedicle, we propose that the arterial perforator should: 1) be more than 1.0 mm large; 2) run a straight intramuscular course, parallel to the rectus abdominis m. fibers, with no large muscular branches; and 3) have only a short portion running immediately under the anterior rectus abdominis sheath. We examined 329 perforators (more than 0.5 mm in diameter at the anterior sheath) in 66 rectus abdominis mm. from 33 cadavers among them: 1) 52 "large" perforators were over 1.0 mm in diameter; 2) 107 "suitable" perforators ran parallel to the muscle fibers without giving off large muscular branches; and 3) 35 "ideal" perforators combined these characteristics. The ideal perforators were usually located in the mid-abdominal region, 10-30 mm lateral to the umbilicus. The suitable perforators were usually present, often in combination with the ideal perforator(s), in a restricted area 20 mm cranial and 40-50 mm lateral to the umbilicus. We classified the course and ramification pattern of the deep inferior epigastric a. into six patterns, depending on whether the anastomosis was sited in the medial or lateral branch and the level at which the branches originated.
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Affiliation(s)
- N Kikuchi
- Section of Plastic and Reconstructive Surgery, Department of Orthopedic Surgery, Yamagata University School of Medicine, 2-2-2 Iidanishi, Yamagata, 990-9585, Japan.
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Ishibashi Y, Sato TJ, Hirai I, Murakami G, Hata F, Hirata K. Ramification pattern and topographical relationship between the portal and hepatic veins in the left anatomical lobe of the human liver. Okajimas Folia Anat Jpn 2001; 78:75-82. [PMID: 11732208 DOI: 10.2535/ofaj1936.78.2-3_75] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Sixty-one human livers obtained from donated Japanese adult cadavers were dissected to reveal the ramification pattern of the portal and hepatic veins, and their topographical relationship in the left anatomical lobe. The segmental portal vein supplying S2 (P2) tended to form a single stem, whereas that of S3 (P3) was usually double. An intermediate branch between P2 and P3 was observed in 23.0% of livers. In spite of variation between livers, definite P2 and P3 were identified in 47 specimens. One tributary of the left hepatic vein (LHV) was usually present for drainage of S2, and two tributaries were present for S3 (sometimes also for S2 and/or S4). The latter two tributaries of the LHV and the two subsegmental branches of S3 showed three patterns of three-dimensional interdigitations. From these results, the portal vein system did not seem to have a two segmental composition (i.e., S2 and S3) in 23.0% of specimens, whereas the hepatic vein system did not have an intersegmental course in 23.4%. Thus, there were obvious limitations in using each system to determine the liver segment. Taking the overlapping cases into consideration, the left anatomical lobe of 41.0% of specimens did not seem to fit the definition of Couinaud's liver segment. In addition, four patterns of fissure vein (or scissural vein), > 5 mm in diameter at its terminal, were identified: (1) middle hepatic vein type (left median vein, 9.8%); (2) LHV type (left medial vein, 41.0%); (3) true fissure vein (3.3%); and (4) absent cases (45.9%). The former two types also suggested limitations of the hepatic vein system as an indicator of the segmental border.
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Affiliation(s)
- Y Ishibashi
- Department of Anatomy, Sapporo Medical University School of Medicine, South 1 West 17, Chuo-ku, Sapporo 060-8556, Japan
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Hashimoto I, Murakami G, Nakanishi H, Sakata-Haga H, Seike T, Sato TJ, Fukui Y. First cutaneous branch of the internal pudendal artery: an anatomical basis for the so-called gluteal fold flap. Okajimas Folia Anat Jpn 2001; 78:23-30. [PMID: 11552287 DOI: 10.2535/ofaj1936.78.1_23] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We investigated the cutaneous blood supply in the gluteal and perineal regions of 35 donated cadavers to provide an anatomical basis for reliable vulvo-vaginal reconstruction using a skin flap such as the so-called gluteal fold flap. The cutaneous areas along the gluteal cleft and sulcus were likely to be supplied by 3 routes: 1) the internal pudendal artery (IPA), especially its first cutaneous branch; 2) perforators running through the gluteus maximus muscle and arising from the inferior gluteal artery (IGA); and 3) a non-perforator running around and inferior to the ischial tuberosity and originating from the IGA. Route 1 supplied the skin along the gluteal cleft, route 2 the gluteal fold (i.e., a bulky skin fold along the upper edge of the gluteal sulcus), and route 3, just along the gluteal sulcus. In those 3 routes, we noted the consistent morphology of the thick and long, first cutaneous branch of the IPA. The first arterial branch, 1.5 mm in diameter at its origin on average (ranging from 0.7-2.6 mm), usually originated from the IPA under the cover of or at the inferomedial or distal side of the sacrotuberous ligament (almost always less than 20 mm from the inferomedial margin of the ligament). The branch ran superomedially toward the coccyx or ran medially in the ischiorectal fat. It accompanied the vein and nerve at its distal (peripheral) course although the nerve often ran independently at its proxomal course near the ligament. Therefore, the first branch of the IPA seems to provide a reliable pedicle using the skin along the gluteal cleft whether the incision for approach is conducted along the gluteal sulcus or not. However, if the gluteus maximus muscle extended much inferomedially, the pedicle would be very short. In this case, preparation of the pedicle seems to be necessary along the arterial course under the cover of the muscle.
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Affiliation(s)
- I Hashimoto
- Department of Plastic and Reconstructive Surgery, Tokushima University School of Medicine, Tokushima, Japan
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Takakura H, Shiono M, Sato TJ, Yamamoto A, Tsai AP. Ab initio structure determination of icosahedral Zn-Mg-Ho quasicrystals by density modification method. Phys Rev Lett 2001; 86:236-239. [PMID: 11177800 DOI: 10.1103/physrevlett.86.236] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2000] [Indexed: 05/23/2023]
Abstract
A novel density modification method is applied for the first time to phase reconstruction of x-ray single crystal data of quasicrystals. The structure of icosahedral Zn-Mg-Ho quasicrystals has been determined by means of this ab initio structure determination within a framework of a 6D description. The location, size, and shape of the occupation domains are deduced. The suggested Ho sites in the 3D structure are consistent with the results of magnetic diffuse scattering [T. J. Sato et al., Phys. Rev. Lett. 81, 2364 (1998)].
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Affiliation(s)
- H Takakura
- National Research Institute for Metals, Tsukuba, Japan
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Ono ML, Murakami G, Sato TJ, Sawada K. Hepatic grooves and portal segmentation. Kaibogaku Zasshi 2000; 75:517-23. [PMID: 11197594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
The aim of the present study was to examine the topographical relationship between the locations of the grooves and the borders of Couinaud's portal segments. We found 79 grooves on the diaphragmatic surfaces of 50 livers from 420 cadavers. Most grooves were located within segment VIII wholly (31/79) or partially (39/79). By contrast, only 11 grooves corresponded to the border between two segments (segments VIII/IV in 6 cases and segments VIII/VII in 5 cases). Diaphragmatic indentations (fold-like protrusions) into the groove were observed in 1 case. Our results suggest that the grooves did not form during the early embryonic period when intrahepatic vessels and ducts ramify, but that they formed during a later stage of diaphragmatic growth after establishment of the basic segmental configuration of the liver. The grooves do not seem to be critical landmarks for segmental borders of the liver.
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Affiliation(s)
- M L Ono
- Department of Anatomy, Sapporo Medical University School of Medicine, South 1 West 17, Sapporo 060-8556, Japan
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Affiliation(s)
- A P Tsai
- National Research Institute for Metals, and CREST, Japan Science and Technology Corporation, Tsukuba.
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Honma M, Murakami G, Sato TJ, Namiki A. Spread of injectate during C6 stellate ganglion block and fascial arrangement in the prevertebral region: an experimental study using donated cadavers. Reg Anesth Pain Med 2000; 25:573-83. [PMID: 11097663 DOI: 10.1053/rapm.2000.8935] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND AND OBJECTIVES The precise fascial space through which the injectate spreads during stellate ganglion block (SGB) remains unclear. Recent studies using magnetic resonance imaging or computed tomography have suggested that the injectate is deposited around and/or within the longus colli muscle during SGB. However, a fascial space, close to the longus colli, is the most likely route of spread. We identified the prevertebral interlaminal space (PVILS), situated between the anterior and posterior laminae of the prevertebral layer of the fascia, as an important route for the spread of the injectate and as a potential pathway to the ganglion. The danger of downward spread of deep infections through this space has previously been recognized. METHODS AND RESULTS Using the 6th cervical vertebra paratracheal approach technique, we performed experimental SGB with 10 mL latex on donated cadavers. Spreading of latex into the PVILS was observed in 45 of 52 (86.5%) cadavers that had been fixed with formaldehyde after death, and 5 of 8 (62.5%) fresh cadavers. In these experiments, the latex usually reached the ganglion via the PVILS (39 of 45 and 5 of 5, respectively). Moreover, after direct injection into the PVILS, latex reached the ganglion in 13 of a further 19 (68.4%) postmortem-fixed donated cadavers. CONCLUSION These results suggest that the PVILS plays a critical role in the spread of injectate as well as being a potential pathway to the stellate ganglion during SGB.
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Affiliation(s)
- M Honma
- Department of Anesthesiology, Sapporo Medical University School of Medicine, South 1 West 16, Chuo-ku, Sapporo 060-8543, Japan
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25
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Ishibashi Y, Murakami G, Honma T, Sato TJ, Takahashi M. Morphometric study of the sphincter of oddi (hepatopancreatic) and configuration of the submucosal portion of the sphincteric muscle mass. Clin Anat 2000; 13:159-67. [PMID: 10797621 DOI: 10.1002/(sici)1098-2353(2000)13:3<159::aid-ca1>3.0.co;2-h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The sphincter of Oddi (SO) hepatopancreatic sphincter from 114 Japanese adults, especially the sphincteric muscle mass lying in the duodenal mucosal layer (the submucosal portion of the SO: SMSO), was measured macroscopically under a binocular microscope. The SMSO was classified into two types according to shape. The horizontal type (95/114) usually displayed a rod-like shape (6.0 mm at average diameter at the root) directed toward the anus and was situated on the duodenal muscle wall with the papillary orifice at or near the tip (anal side) of the SMSO. The horizontal type SMSO followed the underlying muscle wall widely ranging from 5.0 mm to 17.9 mm length (9.8 mm at average) and was attached to the wall by the loose connective tissue along the entire length. In the horizontal type, the extramural portion (the portion penetrating and outside of duodenal muscle of the SO) of the SO was very small. The vertical type (19/114) erected on the muscle wall vertically into the lumen of the duodenum. The average length and average maximum diameter of the vertical type were 6.0 mm and 6.2 mm, respectively. The extramural portion of the SO was thicker and tighter in the vertical type, which suggested that endoscopic sphincterotomy might preserve the length of the SO longer than endoscopic papillary balloon dilation (EPBD). Of the individuals in our study, 18% (19/114) had SO diameters <5 mm, a finding that may have implications for selection of balloon size in EPBD.
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Affiliation(s)
- Y Ishibashi
- Department of Anatomy, Sapporo Medical University School of Medicine, Sapporo, Japan
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26
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Ishibashi Y, Murakami G, Honma T, Sato TJ, Takahashi M. Morphometric study of the sphincter of oddi (hepatopancreatic) and configuration of the submucosal portion of the sphincteric muscle mass. Clin Anat 2000. [PMID: 10797621 DOI: 10.1002/(sici)1098-2353(2000)13:3<159::aid-ca1>3.0.co;2-h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The sphincter of Oddi (SO) hepatopancreatic sphincter from 114 Japanese adults, especially the sphincteric muscle mass lying in the duodenal mucosal layer (the submucosal portion of the SO: SMSO), was measured macroscopically under a binocular microscope. The SMSO was classified into two types according to shape. The horizontal type (95/114) usually displayed a rod-like shape (6.0 mm at average diameter at the root) directed toward the anus and was situated on the duodenal muscle wall with the papillary orifice at or near the tip (anal side) of the SMSO. The horizontal type SMSO followed the underlying muscle wall widely ranging from 5.0 mm to 17.9 mm length (9.8 mm at average) and was attached to the wall by the loose connective tissue along the entire length. In the horizontal type, the extramural portion (the portion penetrating and outside of duodenal muscle of the SO) of the SO was very small. The vertical type (19/114) erected on the muscle wall vertically into the lumen of the duodenum. The average length and average maximum diameter of the vertical type were 6.0 mm and 6.2 mm, respectively. The extramural portion of the SO was thicker and tighter in the vertical type, which suggested that endoscopic sphincterotomy might preserve the length of the SO longer than endoscopic papillary balloon dilation (EPBD). Of the individuals in our study, 18% (19/114) had SO diameters <5 mm, a finding that may have implications for selection of balloon size in EPBD.
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Affiliation(s)
- Y Ishibashi
- Department of Anatomy, Sapporo Medical University School of Medicine, Sapporo, Japan
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Sato TJ, Murakami G, Tsubota H, Isobe M, Akita K, Kataura A. Morphometric study of the medial aspect of the human maxillary sinus with special reference to the nasal fontanelle. Auris Nasus Larynx 2000; 27:121-30. [PMID: 10733139 DOI: 10.1016/s0385-8146(99)00056-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE The purpose of this study was to clarify configurations of the nasal fontanelle (NF) from the morphometrical point of view, especially variations of its four margins (anterior, posterior, superior, and inferior), for clinical application. METHODS We used 136 sides of hemi-sectioned heads that were obtained from 119 donated Japanese cadavers (66 men and 53 women with an average age of 77.6+/-12.0). After mucosal examination, the specimens were boiled with a small amount of powdered soap and treated with protease. The residual mucous membrane was then gently removed. These specimens were originally made for our previous study describing variations of the uncinate process (Isobe M, Murakami G, Kataura A. Variations of the uncinate process of the lateral nasal wall with clinical implications, Clin. Anat. 1998;11:295-303). Different series of measurements were conducted based on surgical approaches and angles of observation. RESULTS The superior margin of the NF is difficult to identify because the ethmoidal infundibulum, which leads the anterior end of the margin upward, often interrupts the superior margin. Because the inferior and posterior margins are modified by thin paper-like bony structures and because the anterior margin is disturbed by variations of the lacrimal bone and/or the inferior turbinate, they are also difficult to identify. Knowing these variables, we evaluated the NF morphometrically. The NF was located 12.6+/-4.3 mm posterior to the anterior nasal spine and 6.6+/-2.2 mm anterior to the sphenopalatine foramen. The size of the NF was 17.9+/-3.2 mm (anteroposterior axis) x 11.5+/-3.0 mm (inferosuperior axis). The lowest orbital floor was located 10 mm below the superior margin of the anterior NF (-10 mm), and the distance was therefore measured as -3.7+/-2.4 mm on average. Viewed from the maxillary sinus, the location of the NF varied along the anteroposterior axis, whereas it was located consistently at the most superior portion of the medial aspect of the sinus wall. CONCLUSION During endoscopic sinus surgery for tumor resection in the maxillary sinus, a large and primary window should be prepared in the posterior NF, including partial removal of the uncinate process. Preparation of an additional window in the inferior meatus is preferable to enlargement of the primary window. Approaching the anterior NF should be avoided, if possible, due to its complicated configuration as well as its proximity to the orbital floor.
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Affiliation(s)
- T J Sato
- Department of Anatomy, Sapporo Medical University School of Medicine, Japan
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Sato TJ, Kadowaki H, Yoshizawa H, Takabatake T, Fujii H, Isikawa Y. The effect of Co doping on antiferromagnetic correlations in the Kondo semi-metal CeNiSn. J Phys Condens Matter 1996; 8:7127-7138. [PMID: 22146154 DOI: 10.1088/0953-8984/8/38/015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Single-crystal neutron scattering experiments have been performed to study magnetic excitations in [Formula: see text], in which the pseudo-gap of CeNiSn is suppressed by the doping. In CeNiSn there are two inelastic excitation peaks at [Formula: see text] and 4 meV, which correspond to dynamic antiferromagnetic correlations. In [Formula: see text] the 2 meV peak is smeared out, whereas the 4 meV peak becomes very weak and broad, but preserves the same quasi-one-dimensional character as that for CeNiSn. These results suggest the strong relation between the antiferromagnetic correlations and the pseudo-gap formation.
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Affiliation(s)
- T J Sato
- Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan
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Daikoku S, Sato TJ, Hashimoto T, Morishita H. Development of the ultrastructures of the median eminence and supraoptic nuclei in rats. Tokushima J Exp Med 1968; 15:1-15. [PMID: 5712565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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