]. C. Berthier96, M. Berthier, M. Julien, Y. Horvatic, and . Berthier, NMR Studies of the Normal State of High Temperature Superconductors, Journal de Physique I, vol.6, issue.12, p.2205, 1996.
DOI : 10.1051/jp1:1996209

J. M. Chen, S. J. Liu, C. F. Chang, J. Lin, Y. S. Gou et al., Soft x-ray absorption spectroscopy studies of doped Pr-containing cuprates, Physical Review B, vol.67, issue.1, p.14502, 2003.
DOI : 10.1103/PhysRevB.67.014502

]. B. Grévin00, Y. Grévin, P. Berthier, G. Mendels, and . Collin, nuclear quadrupole resonance and zero-field NMR study, Physical Review B, vol.61, issue.6, p.4334, 2000.
DOI : 10.1103/PhysRevB.61.4334

M. Lee, T. M. Rice, and P. W. Anderson, Fluctuation Effects at a Peierls Transition, Physical Review Letters, vol.31, issue.7, p.462, 1973.
DOI : 10.1103/PhysRevLett.31.462

]. A. Liechtenstein95, with Different Rare Earths, Physical Review Letters, vol.74, issue.6, p.1000, 1995.
DOI : 10.1103/PhysRevLett.74.1000

]. S. Malik91, C. V. Malik, P. Tomy, and . Bhargava, =Sm, Gd, and Tm), Physical Review B, vol.44, issue.13, p.7042, 1991.
DOI : 10.1103/PhysRevB.44.7042

]. M. Norman03, C. Norman, and . Pepin, The electronic nature of high temperature cuprate superconductors, Reports on Progress in Physics, vol.66, issue.10, pp.1547-1610, 2003.
DOI : 10.1088/0034-4885/66/10/R01

]. J. Peng89, R. N. Peng, H. B. Shelton, P. A. Radousky, L. Hahn et al., compounds, Physical Review B, vol.40, issue.7, p.4517, 1989.
DOI : 10.1103/PhysRevB.40.4517

]. H. Radousky92 and . Radousky, A review of the superconducting and normal state properties of Y1??? xPr xBa2Cu3O7, Journal of Materials Research, vol.27, issue.07, p.1917, 1992.
DOI : 10.1016/0022-5088(89)90517-1

]. L. Soderholm89, G. L. Soderholm, and . Goodman, The oxidation state of Pr in PrBa2Cu3O7, Journal of Solid State Chemistry, vol.81, issue.1, p.121, 1989.
DOI : 10.1016/0022-4596(89)90209-0

W. Xu and . Guan, =Nd, Eu, Gd, Dy, Y, Er, and Yb), Physical Review B, vol.45, issue.6, p.3176, 1992.
DOI : 10.1103/PhysRevB.45.3176

]. H. Yang91, P. F. Yang, C. R. Chen, C. W. Hsu, C. L. Lee et al., systems, Physical Review B, vol.43, issue.13, p.10568, 1991.
DOI : 10.1103/PhysRevB.43.10568

]. F. Zhang88, T. M. Zhang, and . Rice, Effective Hamiltonian for the superconducting Cu oxides, Physical Review B, vol.37, issue.7, p.3759, 1988.
DOI : 10.1103/PhysRevB.37.3759

Z. Zou, K. Oka, T. Ito, and Y. Nishihara, Bulk Superconductivity in Single Crystals of $\bf PrBa_{\bf 2}Cu_{\bf 3}O_{\ninmbi{x}}$, Japanese Journal of Applied Physics, vol.36, issue.Part 2, No. 1A/B, p.18, 1997.
DOI : 10.1143/JJAP.36.L18

]. V. Awana97, R. Awana, L. Singh, J. M. Tellez, J. A. Ferreira et al., System, Modern Physics Letters B, vol.11, issue.07, pp.323-331, 1997.
DOI : 10.1142/S0217984997000402

]. A. Boothroyd97, A. Boothroyd, N. H. Longmore, E. Andersen, T. Brecht et al., Observed by Neutron Diffraction, Physical Review Letters, vol.78, issue.1, p.130, 1997.
DOI : 10.1103/PhysRevLett.78.130

]. J. Chen03, S. J. Chen, C. F. Liu, J. Chang, Y. S. Lin et al., Soft x-ray absorption spectroscopy studies of doped Pr-containing cuprates, Physical Review B, vol.67, issue.1, p.14502, 2003.
DOI : 10.1103/PhysRevB.67.014502

]. G. Collin90, P. A. Collin, P. Albouy, M. Monod, and . Ribault, Praseodymium valency from crystal structure in Pr-Ba-Cu-O and (Y-Pr)-Ba-Cu-O single crystals, Journal de Physique, vol.51, issue.11, p.1163, 1990.
DOI : 10.1051/jphys:0199000510110116300

]. G. Hilscher94, E. Hilscher, T. Holland-moritz, H. Holubar, V. Jostarndt et al., : Inelastic-neutron-scattering, specific-heat, and susceptibility study, Physical Review B, vol.49, issue.1, p.535, 1994.
DOI : 10.1103/PhysRevB.49.535

]. M. Kramer97, K. W. Kramer, D. Dennis, R. W. Falzgraf, S. K. Mccallum et al., =Pr,Nd) system, Physical Review B, vol.56, issue.9, p.5512, 1997.
DOI : 10.1103/PhysRevB.56.5512

]. M. Lopez-morales90, D. Lopez-morales, J. Rios-jara, R. Taguena, S. L. Escudero et al., : Effect on structural and physical properties, Physical Review B, vol.41, issue.10, p.6655, 1990.
DOI : 10.1103/PhysRevB.41.6655

]. S. Malik92, S. M. Malik, C. V. Pattalwar, R. Tomy, N. C. Prasad et al., compounds, Physical Review B, vol.46, issue.1, pp.524-527, 1992.
DOI : 10.1103/PhysRevB.46.524

]. M. Pieper00, F. Pieper, T. Wiekhorst, and . Wolf, by nuclear magnetic resonance, Physical Review B, vol.62, issue.2, p.1392, 2000.
DOI : 10.1103/PhysRevB.62.1392

]. N. Rosov92, J. W. Rosov, Q. Lynn, G. Lin, J. W. Cao et al., via neutron diffraction, Physical Review B, vol.45, issue.2, p.982, 1992.
DOI : 10.1103/PhysRevB.45.982

]. L. Soderholm89, G. L. Soderholm, and . Goodman, The oxidation state of Pr in PrBa2Cu3O7, Journal of Solid State Chemistry, vol.81, issue.1, p.121, 1989.
DOI : 10.1016/0022-4596(89)90209-0

W. Xu and . Guan, =Nd, Eu, Gd, Dy, Y, Er, and Yb), Physical Review B, vol.45, issue.6, p.3176, 1992.
DOI : 10.1103/PhysRevB.45.3176

]. V. Awana97, R. Awana, L. Singh, J. M. Tellez, J. A. Ferreira et al., System, Modern Physics Letters B, vol.11, issue.07, pp.323-331, 1997.
DOI : 10.1142/S0217984997000402

]. F. Givord04, J. Givord, E. Boucherle, P. Lelièvre-berna, and . Lejay, as functions of temperature, Journal of Physics: Condensed Matter, vol.16, issue.8, pp.1211-1241, 2004.
DOI : 10.1088/0953-8984/16/8/007

]. M. Guillaume93, P. Guillaume, B. Fischer, A. Roessli, J. Podlenyak et al., Magnetic order of Pr ions in PrBa2Cu3O6, Solid State Communications, vol.88, issue.1, pp.57-61, 1993.
DOI : 10.1016/0038-1098(93)90769-J

]. A. Harat04, G. Harat, P. Fillion, J. Haen, M. F. Hejmánek et al., Praseodymium and oxygen role on magnetic properties of PrBa2Cu3O6+x, physica status solidi (c), vol.1, issue.7, p.1948, 2004.
DOI : 10.1002/pssc.200304458

]. Y. Lin01, B. N. Lin, Y. X. Lin, Y. Y. Lin, T. I. Hsu et al., Magnetic properties of high-oxygen pressure prepared PrBa2Cu3O7???y cuprates, Journal of Applied Physics, vol.89, issue.11, p.7484, 2001.
DOI : 10.1063/1.1357859

]. J. Peng89, P. Peng, R. N. Klavins, H. B. Shelton, P. A. Radousky et al., compounds, Physical Review B, vol.40, issue.7, p.4517, 1989.
DOI : 10.1103/PhysRevB.40.4517

W. Xu and . Guan, =Nd, Eu, Gd, Dy, Y, Er, and Yb), Physical Review B, vol.45, issue.6, p.3176, 1992.
DOI : 10.1103/PhysRevB.45.3176

]. E. Braun88, G. Braun, B. Jackel, J. G. Roden, D. Sereni et al., Comparative study of the specific heat of superconducting and non-superconducting YBa2Cu3O7?x, Zeitschrift f???r Physik B Condensed Matter, vol.152, issue.Suppl., p.169, 1988.
DOI : 10.1007/BF01312132

]. K. Moler94, G. J. Moler, J. S. Baar, R. Urbach, W. N. Liang et al., as Determined from the Specific Heat, Physical Review Letters, vol.73, issue.20, p.2744, 1994.
DOI : 10.1103/PhysRevLett.73.2744

]. S. Parkin88, E. M. Parkin, V. Y. Engler, R. B. Lee, and . Beyers, on processing conditions, Physical Review B, vol.37, issue.1, p.131, 1988.
DOI : 10.1103/PhysRevB.37.131

]. V. Pasler98, P. Pasler, C. Schweiss, B. Meingast, H. Obst et al., 3D-XY Critical Fluctuations of the Thermal Expansivity in Detwinned YBa2Cu3O7-?? Single Crystals Near Optimal Doping, Physical Review Letters, vol.81, issue.5, p.1094, 1998.
DOI : 10.1103/PhysRevLett.81.1094

]. R. Renzi01, S. Renzi, P. Sanna, G. Manca, and . Allodi, Influence of oxygen order on magnetic properties of YBa2Cu3O6+x, 2001.

]. R. Schaviv90, E. F. Shaviv, M. Westrum, X. Sayer, R. D. Yu et al., from 5.3 to 350 K, The Journal of Chemical Physics, vol.92, issue.11, p.6794, 1990.
DOI : 10.1063/1.458266

L. En-prenant, 177 + 223 = 200 ± 23 10 -6 uem/mol , on obtient une valeur proche de celle de Larkin et al. ( -193 10 -6 uem/mol), 1958.