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O-3 11 Antiferromagnetic and superconducting orders in quasi-one-dimensional organic conductors Claude Bourbonnais 1 , Abdelouahab Sedeki 1 1 Regroupement Québécois des Matériaux de Pointe (RQMP), Département de <strong>phy</strong>sique Université de Sherbrooke, QC, Canada J1K-2R1 The Bechgaard salts series (TMTSF) 2 X (X=PF 6 , ClO 4 , . . . ) of organic conductors stands out as among the first superconductors showing a proximity between antiferromagnetism and superconductivity in their phase diagram under pressure [1]. The amplitude of spin correlations in the metallic state, as probed by the enhancement of NMR spin relaxation rate 1/T 1 and linear-T resistivity, shows a remarkable correlation with the size of the superconducting T c . Both features are captured from the renormalization group theory for the repulsive quasi-one-dimensional electron gas model [2]. In this work, we show how this approach can describe the interplay between the two interfering orders, and how this contributes to both the emergence of a Curie-Weiss type of enhancement for 1/T 1 and an electronelectron scattering rate and electrical resistivity linear in temperature. The results are found to be in excellent agreement with a recent detailed experimental investigation of electrical transport of these materials [1], which have established that the anomalous 1/T 1 enhancement and linear-T resistivity are intimately linked to magnetism and the onset of superconductivity under pressure. [1] N. Doiron-Leyraud et al., Phys. Rev. 80, 214531 (2009) [2] C. Bourbonnais and A. Sedeki, Phys. Rev. 80, 85105 (2009); A. Sedeki, D. Bergeron and C. Bourbonnais, to be published (2010).
O-4 12 NMR and the quasi-one dimensional superconductors (TMTSF) 2 X Stuart Brown 1 1 UCLA The quasi-one dimensional Bechgaard salts (TMTSF) 2 X were the first discovered of the molecular superconductors, and although the transition temperature is low, the systems remain of interest for a number of reasons, including the survival of superconductivity to very high magnetic fields [1,2], and novel normal state properties. Both likely result from spin fluctuations in association with the low dimensionality. Superconductivity is observed in (TMTSF) 2 PF 6 under pressure P > 0.6GPa for T ∼ 1K. At lower pressures, correlations are manifested in the stabilization of a spin-density wave (SDW) ground state. The antiferromagnetic fluctuations persist in the high-conductivity regime, as evidenced by enhanced nuclear spin-lattice relaxation rates. 1/T 1 (T,P) is quite unusual, and was recently interpreted [3] as a consequence of the nature of the quasiparticles in a quasi-one dimensional system with imperfect nesting. Superconductivity surviving to fields exceeding the paramagnetic limit H P is well-known in molecular superconductors. In the case of the quasitwo dimensional materials such as κ-(BEDT-TTF) 2 Cu(NCS) 2 , it is sometimes attributed to the stabilization of inhomogeneous (FFLO) superconductivity for fields aligned with the conducting layers. The situation in (TMTSF) 2 X may be different, and we discuss the possibility of a fieldinducted transition from singlet to triplet superconductivity. [1] I. J. Lee, M. J. Naughton, G. M. Danner, and P. M. Chaikin, Phys. Rev. Lett. 78, (1997) 3555 [2] J. Shinagawa, et al., Phys. Rev. Lett. 98, (2007) 147002 [3] C. Bourbonnais and A. Sedeki, Phys. Rev. B 80, (2009) 085105
Page 1 and 2: ABSTRACT BOOK RECENT ADVANCES IN BR
Page 3 and 4: RECENT ADVANCES IN BROAD BAND SOLID
Page 9 and 10: INVITED LECTURES
Page 11: O-2 10 NMR in Quantum Spin Systems
Page 15 and 16: O-7 14 NMR studies on the new iron
Page 17 and 18: O-9 16 NMR methods for investigatio
Page 19 and 20: O-10 18 Sodium cobaltates: A golden
Page 21 and 22: O-12 20 Broadband NMR at ultra high
Page 23 and 24: O-14 22 Strong Cu-O hybridization i
Page 25 and 26: O-16 24 Kagome Frustrated Antiferro
Page 27 and 28: O-18 26 Multiband Superconductivity
Page 29 and 30: O-20 28 Magnetic and physical prope
Page 31 and 32: O-21 30 NMR spin echo study of RF-I
Page 33 and 34: O-23 32 Clarification of Quantum Cr
Page 35 and 36: O-25 34 Nanoscale electronic order
Page 37 and 38: O-27 36 75 As NMR in Fe pnictide su
Page 39 and 40: O-29 38 NQR study of the phase segr
Page 41 and 42: O-31 40 NMR study of the Tomonaga-L
Page 43 and 44: POSTER CONTRIBUTIONS
Page 45 and 46: P-2 44 Cryogenic static and magic-a
Page 47 and 48: P-4 46 Nuclear Magnetic Resonance E
Page 49 and 50: P-6 48 Charge Induced Vortex Lattic
Page 51 and 52: P-8 50 77 Se NMR study of λ-(BETS)
Page 53 and 54: P-9 52 Electron spin relaxation in
Page 55 and 56: P-10 54 saturation field B c = 14.9
Page 57 and 58: P-12 56 Superionic Conductivity and
Page 59 and 60: P-14 58 NMR study of Quantum Critic
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P-18 62 New Facility for Broadband
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P-20 64 Complex interplay of Ce 4f
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P-21 66 in our experiment. However,
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P-23 68 Observation of the Fermi Li
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P-25 70 Magnetic-field induced phas
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