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80 CHAPTER 3. T-J MODEL ON THE TRIANGULAR LATTICE between magnetism and superconductivity in the electron doped case shows again that superconductivity is decreased in the presence of strong long range magnetic correlations. 3.5 Conclusion In this chapter we have presented a variational Monte Carlo study of the t−J (J/t =0.4 andt
3.5. CONCLUSION 81 the experimental system. Two missing ingredients in the simple t−J model could solve this discrepancy and perhaps allow to obtain a superconducting instability. On one hand, a strong Coulomb repulsion is expected in this type of compound. Such a long-range interaction is not taken into account in the t−J model. Thus acoulombV term should be added to get a t−J−V model. On the other hand, in this chapter, we have used a single-band model as a first step to study the Co-based oxides. However, it is quite possible that the multi-band effect plays an essential role for superconductivity [94]. The interaction between the three bands of the compound could play a non trivial role in the physics of the t−J model. Therefore, a study of the 3-band model could also be of interest. Such an analysis can be done by extending the methods exposed in this chapter to these more complicated models.
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VARIATIONAL STUDY OF STRONGLY CORRE
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4 Abstract
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6 Version abrégée
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8 Acknowledgments check that our di
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10 Acknowledgments
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12 CONTENTS 3.3.5 Order parameters
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14 CONTENTS
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16 CHAPTER 1. INTRODUCTION c Ba 2+
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18 CHAPTER 1. INTRODUCTION the CuO
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20 CHAPTER 1. INTRODUCTION local Co
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22 CHAPTER 1. INTRODUCTION that the
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24 CHAPTER 1. INTRODUCTION (Haldane
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26 CHAPTER 1. INTRODUCTION This can
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28 CHAPTER 1. INTRODUCTION A(r) by
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130 CHAPTER 5. THE FLUX PHASE FOR T
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132 CHAPTER 5. THE FLUX PHASE FOR T
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134 CHAPTER 6. ORBITAL CURRENTS IN
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176 CHAPTER 7. CONCLUSION is the st
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178 CHAPTER 7. CONCLUSION although
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180 BIBLIOGRAPHY [17] E. Dagotto. R
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182 BIBLIOGRAPHY [59] F. F. Assad.
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184 BIBLIOGRAPHY [98] M. Posternak,
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186 BIBLIOGRAPHY [136] B. Fauqué,
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188 BIBLIOGRAPHY
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190 APPENDIX A. DETERMINANTS AND PF
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192 APPENDIX B. A PAIR OF PARTICLES
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Education • Reviewer activity at
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2. Model of strongly correlated ele
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List of publications 1. Ising Trans
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Schools, workshops and conferences
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