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The Institute of Physics ( IOP ) по журналам "EPL (Europhysics Letters)"

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  • G. V. Oppen (1990-01-01)
    Level crossings of Stark substates with m = 0 differing in reflection parity are considered with respect to the detection of parity violation in atomic physics. An interesting example of a 0+-0- crossing occurs in the ...
  • J. M. Bang; L. S. Ferreira; E. Maglione (1992-04-15)
    Using three-body wave functions for 11Li, electric-dipole sum rules are calculated and discussed. Energies of the soft dipole mode are found to agree with experimental ones. Both for light and heavy targets, the electric ...
  • R. Kerkoud; P. Auban-Senzier; D. Jérome; J. M. Lambert; A. Zahab; P. Bernier (1994-02-10)
    We report the measurement of the 13C NMR frequency in K3C60 under pressure. Comparing pressure dependences of the hyperfine spin lattice relaxation rate and of the resonance frequency provides the first determination of ...
  • H. Mayaffre; P. Wzietek; C. Lenoir; D. Jérome; P. Batail (1994-10-20)
    We present 13C NMR measurements carried out under pressure and between 10 and 300 K on a single crystal of the organic superconductor -(ET)2Cu[N(CN)2]Br. Under pressure, the large variation of the Knight shift is interpreted ...
  • G. Quirion; C. Bourbonnais; E. Barthel; P. Auban; D. Jérome; J. M. Lambert; A. Zahab; P. Bernier; C. Fabre; A. Rassat (1993-01-10)
    We report the pressure and temperature dependences of 13C nuclear spin-lattice relaxation time T1 in the normal state of K3C60. From the 1/T1T temperature and pressure profiles, a Fermi-liquid theory is used to investigate ...
  • R. Blinc; T. Apih; A. Fricelj; J. Dolinek; J. Seliger; A. Fuith; W. Schranz; H. Warhanek; D. C. Ailion (1997-09-15)
    We have directly determined with 14N NMR the SCN head-tail flipping rate in KSCN on going through the order-disorder phase transition at Tc. The results can be explained in terms of an asymmetric double-well potential ...
  • P. Wzietek; D. Köngeter; P. Auban; D. Jérome; J. M. Bassat; J. P. Coutures; B. Dubois; Ph Odier (1989-02-15)
    We present the first 17O NMR data obtained in YBa2Cu3O7- powder with Tc = 90 K in which oxygen sites on Cu-O chains had been selectively populated by a gas exchange process performed at low temperature. A comparison between ...
  • H.-A. Bahr; U. Bahr; A. Petzold (1992-07-15)
    Multiple crack propagation caused by thermal shock can be described as a motion in a time-dependent potential with the restriction that no subsequent crack closure (healing) is possible. For equidistant parallel cracks, ...
  • K. Fukamachi (1994-05-20)
    We have found 1/f fluctuations in the Fermi-Pasta-Ulam equation, which is one of the simplest lattice models to describe fundamental properties of lattice vibrations of real substances. The crossover frequency fc between ...
  • I. Vickridge; A. L'Hoir; J. Gyulai; C. Cohen; F. Abel (1990-12-01)
    We have studied the excitation curve of the 27Al(p, )28Si narrow resonance (R = 105 eV) at 992 keV in random and axial channelling geometry on a clean (110) Al single crystal under UHV conditions. The results are compared ...
  • R. Blinc; J. Seliger; J. Dolinsek; D. Arcon (1993-08-10)
    Two-dimensional (2D) separation of interactions 13C NMR spectra of powdered C60 have been measured above and below the structural phase transition at Tc = 260 K. The comparison between experimental and simulated 13C powder ...
  • J. C. Ousset; H. Rakoto; J. M. Broto; G. Matzen; J. F. Bobo; J. Labbe; S. Askenazy (1991-03-15)
    In order to test the 2D character of the conductivity of high-Tc superconductors, we have elaborated GdBa2Cu3O7 films on (100) ZrO2. The c-axis is perpendicular to the plane of the films. Using magnetoresistance measurements ...
  • A. Garcimartín; H. L. Mancini; C. Pérez-García (1992-06-01)
    The dynamics of the fragmentation of a liquid drop falling in a miscible fluid is studied in a Hele-Shaw geometry. We show that this configuration allows quantitative measurements of the characteristic sedimentation velocity ...
  • J. Dolinsek; B. Zalar; R. Blinc (1993-08-01)
    We show that 2D exchange NMR in deuteron glasses allows for a direct determination of the intra-H-bond deuteron exchange in the double-minimum OD---O potential as well as for a measurement of the Edwards-Anderson order ...
  • S. A. Kivelson; D. S. Rokhsar; J. P. Sethna (1988-06-15)
    The resonating valence bond (RVB) state has been proposed as the basis for an explanation of high-temperature superconductivity. Recently, we have described the charge and spin excitations about this state, and have shown ...
  • R. M. Diehl; F. Fujara; H. Sillescu (1990-10-01)
    2H-NMR stimulated echo experiments have been performed in order to study the molecular basis of the -process in viscous glycerol near its glass transition temperature. Decay functions following modified Jeener-Broekaert ...
  • M. Richter; J. M. Bizau; D. Cubaynes; T. Menzel; F. J. Wuilleumier; B. Carré (1990-05-01)
    Inner-shell photoionization from the 2s shell of atomic sodium in the ground and first laser-excited states has been investigated. Strong electron correlation effects manifest themselves in a number of satellite emissions ...
  • F. F. Kurp; Th. Tschentscher; H. Schulte-Schrepping; J. R. Schneider; F. Bell (1996-07-01)
    The complete 3D-electron momentum density (EMD) of solids can be measured by the coincident detection of an inelastically scattered hard X-ray photon and its recoil electron (i.e. a so-called (,e) experiment). To avoid ...
  • S. Caracciolo; G. Parisi; S. Patarnello; N. Sourlas (1990-04-15)
    We present the results of extensive computer simulations of 3d Ising spin-glasses in the presence of a uniform magnetic field. We compute the internal energy, the magnetization, the spin-spin overlap probability distribution ...
  • M. Tlidi; M. Haelterman; P. Mandel (1998-06-01)
    Spontaneous three-dimensional pattern formation occurs in a passive nonlinear and dispersive ring cavity. A weakly nonlinear theory in the vicinity of the bifurcation point where these patterns emerge reveals the predominance ...