Switching Reciprocity On and Off in a Magneto-Optical X-Ray Scattering Experiment Using Nuclear Resonance of 57Fe Foils

Reciprocity is when the scattering amplitude of wave propagation satisfies a symmetry property, connecting a scattering process with an appropriate reversed one. We report on an experiment using nuclear resonance scattering of synchrotron radiation, which demonstrates that magneto-optical materials do not necessarily violate reciprocity. The setting enables to switch easily between reciprocity and its violation. In the latter case, the exhibited reciprocity violation is orders of magnitude larger than achieved by previous wave scattering experiments.

One-dimensional Ising-like systems: an analytical investigation of the static and dynamic properties, applied to spin-crossover relaxation

We investigate the dynamical properties of the 1-D Ising-like Hamiltonian taking into account short and long range interactions, in order to predict the static and dynamic behavior of spin crossover systems. The stochastic treatment is carried out within the frame of the local equilibrium method [1]. The calculations yield, at thermodynamic equilibrium, the exact analytic expression previously obtained by the transfer matrix technique [2]. We mainly discuss the shape of the relaxation curves: (i) for large (positive) values of the short range interaction parameter, a saturation of the relaxation curves is observed, reminiscent of the behavior of the width of the static hysteresis loop [3]; …

Analytical solution of 1D Ising-like systems modified by weak long range interaction

It is well-known that 1D systems with only nearest neighbour interaction exhibit no phase transition. It is shown that the presence of a small long range interaction treated by the mean field approximation in addition to strong nearest neighbour interaction gives rise to hysteresis curves of large width. This situation is believed to exist in spin crossover systems where by the deformation of the spin changing molecules, an elastic coupling leads to a long range interaction, and strong bonding between the molecules in a chain compound leads to large values for nearest neighbour interaction constants. For this interaction scheme an analytical solution has been derived and the interplay betwe…

Debye-Waller factor in the spin crossover complex Fe(ppi)2(NCS)2

Abstract Mossbauer spectroscopy and magnetic susceptibility measurements for the complex Fe(ppi) 2 (NCS) 2 in the temperature range 11–300 K indicate that the spin transition of this compound is incomplete until 11 K. The similar Debye-Waller factors in high spin (HS) and low spin (LS) states is shown by the comparison of the HS fractions from the two different methods. The Debye temperature of the compound was calculated from the defined Debye-Waller factors obtained from Mossbauer measurement at each experimental temperature and was found to depend on the temperature as well as on the HS fraction. The modification of the Debye-Waller factors in the HS and LS states for the HS fraction fro…

TEXTURE PROBLEMS AND THE GOLDANSKII-KARAGIN EFFECT TREATED BY THE INTENSITY MATRIX METHOD

The texture problem and the Goldanskii-Karyagin effect are easy to survey if the intensities of the transitions are written in terms of the intensity matrix. For pure magnetic and quadrupole interaction the equations are explicitly given.

Poster contributions

CCDC 273105: Experimental Crystal Structure Determination

Related Article: J.Kusz, D.Schollmeyer, H.Spiering, P.Gütlich|2005|J.Appl.Crystallogr.|38|528|doi:10.1107/S0021889805009891

CCDC 273101: Experimental Crystal Structure Determination

Related Article: J.Kusz, D.Schollmeyer, H.Spiering, P.Gütlich|2005|J.Appl.Crystallogr.|38|528|doi:10.1107/S0021889805009891

CCDC 140600: Experimental Crystal Structure Determination

Related Article: H.Oshio, H.Spiering, V.Ksenofontov, F.Renz, P.Gutlich|2001|Inorg.Chem.|40|1143|doi:10.1021/ic000714a

CCDC 251391: Experimental Crystal Structure Determination

Related Article: J.Kusz, H.Spiering, P.Gutlich|2004|J.Appl.Crystallogr.|37|589|doi:10.1107/S0021889804011720

CCDC 251392: Experimental Crystal Structure Determination

Related Article: J.Kusz, H.Spiering, P.Gutlich|2004|J.Appl.Crystallogr.|37|589|doi:10.1107/S0021889804011720

CCDC 273100: Experimental Crystal Structure Determination

Related Article: J.Kusz, D.Schollmeyer, H.Spiering, P.Gütlich|2005|J.Appl.Crystallogr.|38|528|doi:10.1107/S0021889805009891

CCDC 109493: Experimental Crystal Structure Determination

Related Article: R.Hinek, H.Spiering, D.Schollmeyer, P.Gutlich, A.Hauser|1996|Chem.-Eur.J.|2|1427|doi:10.1002/chem.19960021115

CCDC 273102: Experimental Crystal Structure Determination

Related Article: J.Kusz, D.Schollmeyer, H.Spiering, P.Gütlich|2005|J.Appl.Crystallogr.|38|528|doi:10.1107/S0021889805009891

CCDC 251390: Experimental Crystal Structure Determination

Related Article: J.Kusz, H.Spiering, P.Gutlich|2004|J.Appl.Crystallogr.|37|589|doi:10.1107/S0021889804011720

CCDC 214223: Experimental Crystal Structure Determination

Related Article: J.Kusz, H.Spiering, P.Gutlich|2001|J.Appl.Crystallogr.|34|229|doi:10.1107/S0021889801000462

CCDC 238902: Experimental Crystal Structure Determination

Related Article: A.J.Simaan, M.-L.Boillot, R.Carrasco, J.Cano, J.J.Girerd, T.A.Mattioli, J.Ensling, H.Spiering, P.Gutlich|2005|Chem.-Eur.J.|11|1779|doi:10.1002/chem.200400484

CCDC 214224: Experimental Crystal Structure Determination

Related Article: J.Kusz, H.Spiering, P.Gutlich|2001|J.Appl.Crystallogr.|34|229|doi:10.1107/S0021889801000462

CCDC 238903: Experimental Crystal Structure Determination

Related Article: A.J.Simaan, M.-L.Boillot, R.Carrasco, J.Cano, J.J.Girerd, T.A.Mattioli, J.Ensling, H.Spiering, P.Gutlich|2005|Chem.-Eur.J.|11|1779|doi:10.1002/chem.200400484

CCDC 214222: Experimental Crystal Structure Determination

Related Article: J.Kusz, H.Spiering, P.Gutlich|2001|J.Appl.Crystallogr.|34|229|doi:10.1107/S0021889801000462

CCDC 273104: Experimental Crystal Structure Determination

Related Article: J.Kusz, D.Schollmeyer, H.Spiering, P.Gütlich|2005|J.Appl.Crystallogr.|38|528|doi:10.1107/S0021889805009891

CCDC 251393: Experimental Crystal Structure Determination

Related Article: J.Kusz, H.Spiering, P.Gutlich|2004|J.Appl.Crystallogr.|37|589|doi:10.1107/S0021889804011720

CCDC 273103: Experimental Crystal Structure Determination

Related Article: J.Kusz, D.Schollmeyer, H.Spiering, P.Gütlich|2005|J.Appl.Crystallogr.|38|528|doi:10.1107/S0021889805009891

CCDC 140601: Experimental Crystal Structure Determination

Related Article: H.Oshio, H.Spiering, V.Ksenofontov, F.Renz, P.Gutlich|2001|Inorg.Chem.|40|1143|doi:10.1021/ic000714a

CCDC 140599: Experimental Crystal Structure Determination

Related Article: H.Oshio, H.Spiering, V.Ksenofontov, F.Renz, P.Gutlich|2001|Inorg.Chem.|40|1143|doi:10.1021/ic000714a

CCDC 251394: Experimental Crystal Structure Determination

Related Article: J.Kusz, H.Spiering, P.Gutlich|2004|J.Appl.Crystallogr.|37|589|doi:10.1107/S0021889804011720