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Including pairing fluctuations within the framework of an extended $T$-matrix approximation, we show that $\\chi_{\\rm s}$ exhibits non-monotonic temperature dependence in the normal state. In particular, $\\chi_{\\rm s}$ is suppressed near the superfluid phase transition temperature $T_{\\rm c}$ due to strong pairing fluctuations. 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Tajima, R. Hanai, R. Watanabe, T. Kashimura, Y. Ohashi","submitted_at":"2013-12-04T06:13:08Z","abstract_excerpt":"We investigate the uniform spin susceptibility $\\chi_{\\rm s}$ in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover regime of an ultracold Fermi gas. Including pairing fluctuations within the framework of an extended $T$-matrix approximation, we show that $\\chi_{\\rm s}$ exhibits non-monotonic temperature dependence in the normal state. In particular, $\\chi_{\\rm s}$ is suppressed near the superfluid phase transition temperature $T_{\\rm c}$ due to strong pairing fluctuations. 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