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The Valence of Samarium in the Mixed-Valence Transition in SmSe

The microscopic nature of the mixed-valence transition is of fundamental interest. We have used L-edge absorption spectroscopy to measure the valence of SmSe versus pressure at 77K and at 300K. With pressure SmSe undergoes a continuous valence transition as the Sm valence fluctuates between 2+ and 3+. We find that the valence varies with pressure as ((P-Pc)/Pc)α where the critical pressure is Pc=31.6 kbar. The exponent α was found to have the value 0.44 which is less than the value 1/2 expected for mean field theories.