UNIVERSITY OF CALIFORNIA IRVINE
Inelastic Neutron Scattering Study of the Intermediate Valence Compounds CePd3 and YbAl3
DISSERTATION
submitted in partial satisfaction of the requirements for the degree of
DOCTOR OF PHILOSOPHY
in Physics by Victor Roberto Fanelli
Dissertation Committee: Professor Jon M. Lawrence, Chair Professor Alexander Chernyshev Professor Peter Taborek
2009
c 2009 Victor Roberto Fanelli
The dissertation of Victor Roberto Fanelli is approved, and is acceptable in quality and form for publication on microlm and in digital formats:
Committee Chair
University of California, Irvine 2009
To Rosi, Guadi and Agustina
iii
Table of Contents
Page List of Figures List of Tables Acknowledgement Curriculum Vitae Abstract of the Dissertation 1 Introduction 1.1 General Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Basic Phenomenological Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2.a Magnetic Susceptibility, Specific Heat and Valence . . . . . . . . . . . . . 1.2.b Neutron Scattering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2.c Scaling in Intermediate Valence Compounds . . . . . . . . . . . . . . . . . . . 1.2.d Coherence in Intermediate Valence Compounds . . . . . . . . . . . . . . . . 1.3 Theoretical Overview ......................................... vi x xi xiii xv 1 2 4 4 8 10 10 13 13 20 29
1.3.a The Anderson Impurity Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3.b The Anderson Lattice Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 Objectives and Dissertation Organization . . . . . . . . . . . . . . . . . . . . . . . . .
2 Experimental Techniques 2.1 Sample Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Inelastic Neutron Scattering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2.a Neutron Scattering Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2.b Experimental Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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