著者

Miyazima Sasuke OKIJI Ayao

出版者

一般社団法人日本物理学会

雑誌

Journal of the Physical Society of Japan (ISSN:00319015)

巻号頁・発行日

vol.32, no.5, pp.1188-1201, 1972-05-05

被引用文献数

5

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The localized spin wave associated with two different impurities in an insulating b.c.c. antiferromagnet is investigated within the linear spin wave theory. The four cases with regard to the relative position of two impurities which include the case of nearest neighbor positions are considered. The energy of localized spin wave is calculated for the various values of exchange integrals and the magnitude of impurity spin. It may be concluded that some of the localized spin wave modes of the first impurity are not affected even if the second impurity is on the vicinity of the first impurity. When the same two impurities are on the same sublattice the larger interferential effect on the localized spin wave energy is induced than on the different sublattice. The dependence of localized spin wave energy on the distance between two impurities is discussed briefly.

著者

Kawabata Arisato

出版者

一般社団法人日本物理学会

雑誌

Journal of the Physical Society of Japan (ISSN:00319015)

巻号頁・発行日

vol.67, no.7, pp.2430-2438, 1998-07-15

被引用文献数

4

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Electron condtrction in one-dinaaensional systetn is investigated explicitly taking into accountthe reservoirs to which 10 channel is connected at its ends. We calculate the ctrrrent driven bythe cheznical potential difference of two reservoirs, trsing the linear response theory by Kubo. AtOK, the conductance of 10 channel is expressed in terrns of one-electron Green's ftrnctions evenin the presence of the interaction, in contrast to the theory based on Ktrbo forrntrla, in whichtwo-electron Green's functions are essentially involved. The fornaalisna in this paper providesa new interpretation of' Landauer forratula. As regards the interaction ef['ects, the conductanceof Feruni liqtrid without potential scattering is 2e'/ h, while that of' Tornonaga-Luttinger liquiddeceases wuth power low as the length of' ID channel increases.

著者

Iwasaki Yuishi Yonezawa Fumiko

出版者

一般社団法人日本物理学会

雑誌

Journal of the Physical Society of Japan (ISSN:00319015)

巻号頁・発行日

vol.68, no.5, pp.1751-1759, 1999-05-15

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XX7e sttrdy ata error catatstrophe of a self-replicating s5rstetaa, in xvluicl? a 11111111)Cll of' 1.ci{, stringswith variable rnutation rate cozaupete to strrvive itt a gixzen rttgged fitness Jatndsc?tpe. The errorcatastrophe is knoxvn 218 a plaase tr?ttasitiota f'rouaa 2'LIl ordered st;tie to a disordered state xvlaett z'tuautrtatiora rate increases. As a control p;trataaeter, we choose 21, selectiora pressttr'e ratlaer tla;tta 21nntrtatiora rate. We find tlaat our systeraa shoxvs tlae error catastrophe xvlaera tlae selectiota presstrredecreases. An order para?aaeter is itutrodtrced arad the error cat;tstr'oplue is sttrdied for tluree typesof zmtrtant; (a) C2lCl1 bit has a fixed ttautation t-ate, (b) eacl? TciL hats a COIIIIIIOII x'?trialole ?aatut?ationrate, and (c) each lcit has z't variable raatrtation rate. XN7e 21180 atr'aalvze staloilit3z of' the systezau 011the basis of the eic'envaltte and tlae ei'eraxvector of tlae tratusitiora tnatrixb15:

著者

Morita Kosuke Morimoto Kouji Kaji Daiya AKIYAMA Takahiro GOTO Sin-ichi HABA Hiromitsu IDEGUCHI Eiji KANUNGO Rituparna KATORI Kenji KOURA Hiroyuki KUDO Hisaaki OHNISHI Tetsuya OZAWA Akira SUDA Toshimi SUEKI Keisuke XU HuShan YAMAGUCHI Takayuki YONEDA Akira YOSHIDA Atsushi ZHAO YuLiang

出版者

一般社団法人日本物理学会

雑誌

Journal of the Physical Society of Japan (ISSN:00319015)

巻号頁・発行日

vol.73, no.10, pp.2593-2596, 2004-10-15

被引用文献数

6 461

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The convincing candidate event of the isotope of the 113th element, ^<278>113, and its daughter nuclei, ^<274>111 and ^<270>Mt, were observed, for the first time, in the ^<209>Bi + ^<70>Zn reaction at a beam energy of 349.0MeV with a total dose of 1.7 × 10^<19>. Alpha decay energies and decay times of the candidates, ^<278>113, ^<274>111, and ^<270>Mt, were (11.68 ± 0.04MeV, 0.344ms), (11.15 ± 0.07MeV, 9.26ms), and (10.03 ± 0.07 MeV, 7.16ms), respectively. The production cross section of the isotope was deduced to be55^<+150>_<45> fb(10^<-39>cm^2).

著者

Inada Yasuzi Nasu Keiichiro

出版者

一般社団法人日本物理学会

雑誌

Journal of the Physical Society of Japan (ISSN:00319015)

巻号頁・発行日

vol.61, no.12, pp.4511-4520, 1992-12-15

被引用文献数

8

---

Superconducting transition temperatures of a many-electron system coupledstrongly w'ith anharmonic PIIOIIOIIS have been studied, to clarify how drasticallyanlaarmonicity changes tlae isotope effect from the harmonic case. The diagonal self-energy of electron as well as tlte off-diagonal one is determined self-consistentlywitlain Migdal's approxinaation. Typical two types of anharmonicities are studied.The first is a sextic anharmonicity induced by a hard-core repulsion. Isotope shiftsbecome almost zero in this case. Whena Thais repulsion is stronger, the shifts are re-versed. The second is a small negative quartic anharmonicity in additiora to the sexticone, just in tlae case of a mixture of a hard-core and a soft one. In this case, on thecontrary, the slaifts are greatly enhancecl. Discussion is also given in relation to the ob-served anomalous isotope effects of newly discovered superconductors[isotope effect, superconductivity, N4igda1-Eliashberg theory, anharmonic ll phononl

著者

FUJIWARA Takeo FUSE Mario TANABE Yukito

出版者

一般社団法人日本物理学会

雑誌

Journal of the Physical Society of Japan (ISSN:00319015)

巻号頁・発行日

vol.44, no.4, pp.1397-1398, 1978-04-15

被引用文献数

12

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We study the electronic density of states of a model amorphous metal, i.e.Dense-Random-Packing-I-far<J-Spheres spherical system coxtsisting of 1348 hardspheres, by using the recursion method. Average<i local dena;ity of states is shownfor two different magnitudes. of hopping matrix elements. It is found that thepeak positions shift towards; lower energy side, though ltalf-value width andL-point singularity are preserved compared to infinite FCC crystals.

著者

Yanase Youichi Ogata Masao

出版者

一般社団法人日本物理学会

雑誌

Journal of the Physical Society of Japan (ISSN:00319015)

巻号頁・発行日

vol.72, no.3, pp.673-687, 2003-03-15

被引用文献数

10 81

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Triplet superconductivity in Sr_2RuO_4 is investigated with main interest on its internal degree of freedom. We perform a microscopic calculation to investigate how the chiral state d^^^(k) = (k_x ± ik_y)z^^^ is realized among the underlying six degenerate states. Starting from the three hand Huhhard model with spin-orbit interaction, we use a perturbation theory in order to calculate the pairing interaction. The p-wave superconductivity with T_c 〜 1.5 K is obtained in the moderately weak coupling region. It is shown that the orbital dependent superconductivity (ODS) robustly appears in Sr_2RuO_4. We determine the stabilized state by solving the Eliashberg equations. We find that the Hund coupling term as well as the spin-orbit interaction is necessary for the "symmetry breaking interaction". The main result is that the chiral state is stabilized in case of the p-wave symmetry with the main γ-band, which is obtained in the perturbation theory. When we assume the other pairing symmetry including the &fnof;-wave state, the symmetry breaking interaction gives the other d-vector. The electronic structure constructed from the t_2_g-orbitals is essential for this result.