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- W1700306077 abstract "We theoretically investigate magnetic properties of a unitary Fermi gas in a harmonic trap. Including strong pairing fluctuations within the framework of an extended $T$-matrix approximation (ETMA), as well as effects of a trap potential within the local density approximation (LDA), we calculate the local spin susceptibility $chi(T,r)$ above the superfluid phase transition temperature $T_{rm c}$. We show that the formation of preformed singlet Cooper pairs anomalously suppresses $chi(T,r)$ in the trap center near $T_{rm c}$. We also point out that, in the unitarity limit, the spin-gap temperature in a uniform Fermi gas can be evaluated from the observation of the spatial variation of $chi(T,r)$. Since a real ultracold Fermi gas is always in a trap potential, our results would be useful for the study of how this spatial inhomogeneity affects thermodynamic properties of an ultracold Fermi gas in the BCS-BEC crossover region." @default.
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- W1700306077 date "2015-12-07" @default.
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- W1700306077 title "Spin Susceptibility and Effects of Inhomogeneous Strong Pairing Fluctuations in a Trapped Ultracold Fermi Gas" @default.
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- W1700306077 doi "https://doi.org/10.1007/s10909-015-1383-x" @default.
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