Hund's metal physics: From <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SrNiO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>LaNiO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Abstract

Using SrNiO${}_{2}$ as a reference system, the authors find multiorbital Hund's metal behavior in the new Ni-based superconductor Nd${}_{1\ensuremath{-}x}$ SrxNiO${}_{2}$ by many-body $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ calculations. They show that both the weights of Ni 3$d$ multiplets and total Ni 3$d$ occupancy are barely changed from the typical Hund's metal SrNiO${}_{2}$ to LaNiO${}_{2}$ in spite of the large charge-carrier doping. The calculations are well justified by existing experiments with important implications on the pairing mechanism.

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