Crystal Field Effects in Metals and Alloys. Questo articolo non è disponibile.Crystal Field Effects in Metals and Alloys

The idea of this conference grew out of the rapidly increas­ ing volume of experimental facts. and theoretical concepts related to the problem of crystal-field effects in metals and alloys. The crystal field plays an important role in the understanding of the energetic level structure of ions in condensed matter. In partic­ ular, the magnetic properties of rare earth metals and alloys are strongly influenced by the crystal field. In the phenomenological theory the crystal field successfully describes the static and dynamic magnetic properties of these systems. On the other hand the microscopic origin of the crystal field in metals is not yet fully understood. However, recent years have seen some of the areas of crystal-field effects mature to the point that they should be summarized and brought to the active notice of a larger audience. In addition, a number of exciting developments have occured which deserve attention. This book contains 13 invited and 45 contributed papers pres­ ented at the 2nd international conference on crystal-field effects in metals and alloys held at ZUrich, Switzerland, September 1-4, 1976. Emphasis was placed on the following specific categories of interest: spin waves and excitons, soft modes and critical effects, magnetic properties, physical properties influenced by crystal­ field effects, actinides and valency. Because the conference was relatively small, about 120 participants, and because the topic was relatively narrow, recent work in the field could be treated thor­ oughly and the present state of knowledge assessed comprehensively.

Session A: Plenary Address.- Reconciling Localized Moments with Lattice Periodicity (Invited Paper).- Session B: Spin Waves I.- Spin Waves in Anisotropic Magnets (Invited Paper).- Spin Waves in HoZn.- Ground- and Excited-State Spin Waves in Holmium Phosphide.- Neutron Crystal-Field Spectroscopy in PrSn3.- Crystal Fields in PrX3 (X=In, Tl, Pb, Sn) Intermetallic Compounds with Cu3Au Structure.- Crystal Fields in Pr-Hydrides.- Neutron Spectroscopy of the Crystal-Field Splitting in Cerium Hydride.- Session C: Magnetic Properties I.- EPR Studies of Excited State Exchange and Crystal-Field Effects in Rare Earth Compounds (Invited Paper).- ESR of Impurity as a Probe for the Host Exchange Interaction in Tm Van Vleck-Compounds.- EPR of Gd3+ in Lu and Sc Single Crystals.- EPR Fine Structure of S State Ions.- Session D: Critical Effects I.- Soft Electronic and Vibrational Modes near Phase Transitions (Invited Paper).- Induced Jahn Teller Transition in PrCu2.- Crystal Fields and Dynamic Jahn Teller Coupling of an Electronic Quartet to ?5 Lattice Modes in the Fine Structure of Er3+ in Pd-Er.- Spin Dynamics of the S=2 Magnet in a Cubic Crystal Field.- Critical Behaviour of the Magnetization in TbSb and Tb0.6Y0.4Sb.- Session E: Physical Properties I.- Crystal Electric Field Effects on Thermal and Transport Properties (Invited Paper).- Magnetoresistance of Praseodymium.- Resistivity Measurements on the Singlet Ground State System TbcY1-cSb. Effects of Electron Exciton Scattering.- Crystal-Field Effects in the Transport Properties of Rare Earth Alloys.- Short Range Van Vleck Antiferromagnetism in Superconducting La1-yTbySn3 Detected by Neutron Scattering.- Session F: Magnetic Properties II.- Crystal-Field Effects in Laves and other Rare Earth Iron and Rare Earth Cobalt Compounds (Invited Paper).- Influence of Crystal Field Interaction on the Thermal Behaviour of ErAl2.- Magnetization Behaviour of DyAl2 and GdAl2.- Effect of Magnetic Anisotropy on the Heat Capacity of HoAl2.- Magnetic Anisotropy in Dilute Manganese Alloys.- Crystal Field Effects in Dy2Ni17 from Mössbauer Spectroscopy.- Rare Earth Wave Function Determination by Polarized Neutron Diffraction in REAl2.- Session G: Critical Effects II / Spin Waves II.- The Cooperative Jahn-Teller Effect Studied by Neutron Scattering (Invited Paper).- Local Jahn-Teller Effect at a Structural Phase Transition.- Spin Waves and Central Modes in Crystal Field Systems (Invited Paper).- Spin Dynamics of a Kondo System in the Presence of Crystal Fields.- Behaviour of Crystal Field Parameters in ErM and HoM Equiatomic Compounds, in Relationship with Band Structure.- Crystal Field in Liquid Rare Earth Metals.- Session H: Actinides, Transition Metals, Valency.- Crystal Fields in Actinide Intermetallics — Prospects and Problems (Invited Paper).- Enhanced Coulomb and Exchange Interaction Crystal Fields in the Modified Zener Model of Magnons in Metallic Ferromagnets.- Ionic Energy Levels of 3d Impurities in Normal Metals.- Thermal Conductivity of Antiferromagnetic FeCl2.- Crystal Field Effects on Hydrogen in Transition Metals.- Neutron Scattering from Paramagnetic Cerium.- Session J: Magnetic Properties III / Spin Waves III.- Pressure Dependence of the Magnetic Properties of Some Rare Earth Intermetallic Systems (Invited Paper).- Study of Hyperfine Interactions in Solids by Inelastic Spin Flip Scattering of Neutrons.- A Method for Calculating the Electrostatic Potential in Crystal Lattices.- Neutron Inelastic Scattering Study of the Compound CeAl3.- Crystal Electric Fields in Rare-Earth Al2 Compounds.- Crystal-Field Splitting and Relaxation Effects in CeAs.- Session K: Physical Properties II.- Line Width of Crystal-Field Excitations due to Electrons and Phonons (Invited Paper).- Inelastic Coulomb Scattering of Conduction Electrons in (LaPr)Sn3.- Crystal Field and Physical Properties of RX3 Compounds.- Influence of the Crystalline Field on the Kondo Effect: Cerium and Ytterbium Impurities.- Crystal Field Effects on the Specific Heat of (LaEr)Al2.- Experimental Evidence for the Presence of a Non-magnetic 5d Virtual Bound State in the 4f-Kondo Alloy AuYb.- Session L: Magnetic Properties IV.- NMR Study of Singlet Ground State Systems (Invited Paper).- Low Temperature NMR Knight Shift Studies in SmSn3.- Spin Reorientations in the Rare Earth-Cobalt Laves Phases.- Exchange vs Crystal Fields in Gd-Pr Single Crystal Alloys.- Session M: Summary.- Conference Summary (Invited Paper).- List of Participants.