Mott gap softening coinciding with spin correlations collapse in α- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>RuCl</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:math>

The Mott insulator α <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mrow> <a:mrow> <a:mtext>−</a:mtext> <a:mi>RuC</a:mi> </a:mrow> <a:msub> <a:mi mathvariant="normal">l</a:mi> <a:mn>3</a:mn> </a:msub> </a:mrow> </a:math> , featuring the intertwined interplay of spin-orbit coupling and Kitaev spin correlations, provides an unparalleled platform for probing quantum many-body physics. Using scanning tunneling microscopy/spectroscopy, we compare temperature-dependent <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"> <c:mrow> <c:mi mathvariant="italic">dI</c:mi> </c:mrow> <c:mo>/</c:mo> <c:mrow> <c:mi mathvariant="italic">dV</c:mi> </c:mrow> </c:math> spectra between grown monolayers and exfoliated bulk samples. Both systems exhibit pronounced Mott gap softening near 110 K, manifested by spectral weight transfer from Hubbard bands toward the Fermi level, resulting in low-energy correlated charge delocalization. Although this gap softening coincides with Kitaev paramagnetic and structural phase transitions in bulk crystals, monolayer studies provide compelling insights. By eliminating structural phase transition in monolayer sample, we suggest that spin correlations, rather than Coulomb interactions alone, may govern charge dynamics within the Mott-Hubbard framework, challenging conventional Mott-Hubbard paradigms. These results resolve a long-standing controversy regarding the Mott gap magnitude in α <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"> <f:mrow> <f:mrow> <f:mtext>−</f:mtext> <f:mi>RuC</f:mi> </f:mrow> <f:msub> <f:mi mathvariant="normal">l</f:mi> <f:mn>3</f:mn> </f:msub> </f:mrow> </f:math> and experimentally confirm the critical role of spin correlations in Mott physics.