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On the superconducting state of the organic conductor (TMTSF)₂ClO₄

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arxiv cond-mat/0701566 v2 pith:FT6BIRO7 submitted 2007-01-23 cond-mat.str-el cond-mat.supr-con

On the superconducting state of the organic conductor (TMTSF)₂ClO₄

J. Shinagawa , Y. Kurosaki , F. Zhang , C. Parker , S. E. Brown , D. Jerome , J. B. Christensen , K. Bechgaard This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords conductorfieldfieldsorganicspinstatetmtsfbechgaard
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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$(TMTSF)_2ClO_4$ is a quasi-one dimensional organic conductor and superconductor with $T_c=1.4$K, and one of at least two Bechgaard salts observed to have upper critical fields far exceeding the paramagnetic limit. Nevertheless, the $^{77}$Se NMR Knight shift at low fields reveals a decrease in spin susceptibility $\chi_s$ consistent with singlet spin pairing. The field dependence of the spin-lattice relaxation rate at 100mK exhibits a sharp crossover (or phase transition) at a field $H_s\sim15$kOe, to a regime where $\chi_s$ is close to the normal state value, even though \hc2 $\gg H_s$.

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