Negative $c$-axis longitudinal magnetoresistance in FeSe

Gladys Nieva; Jorge I. Facio; M. Lourdes Amig\'o

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arxiv 2412.02677 v1 pith:GV3FQZZC submitted 2024-12-03 cond-mat.supr-con cond-mat.str-el

Negative c-axis longitudinal magnetoresistance in FeSe

M. Lourdes Amig\'o , Jorge I. Facio , Gladys Nieva This is my paper

classification cond-mat.supr-con cond-mat.str-el

keywords fesemagnetoresistanceappliedaxiscurrentfieldlongitudinalmagnetic

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Below the structural transition occurring at $T_s=90$\,K, FeSe exhibits positive transverse magnetoresistance when the current is applied parallel to the $ab$-plane. In this study, we show that, in contrast, when both the magnetic field and the current are aligned along the $c$-axis, the magnetotransport changes significantly. In this configuration, FeSe develops a sizable negative longitudinal magnetoresistance ($\sim$15\% at $T$=10\,K and $\mu_0H$=16\,T) in the nematic phase. We attribute this finding to the effect of the applied magnetic field on the scattering from spin fluctuations. Our observations reflect the intricate interplay between spin and orbital degrees of freedom in the nematic phase of FeSe.

Negative c-axis longitudinal magnetoresistance in FeSe

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