Anomalous low-temperature specific heat around the metal-insulator transition in ordered double-perovskite alloys<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mo</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">W</mml:mi></mml:mrow><mml:mrow><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>)</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mn>0</mml:mn><mml:mn /><mml:mo><~</mml:mo><mml:mi>y</mml:mi><mml:mo><~</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo></mml:math>

DOI

Search this article

Description

Low-temperature excitation has been investigated for polycrystals of ordered double-perovskite alloys ${\mathrm{Sr}}_{2}\mathrm{Fe}({\mathrm{Mo}}_{1\ensuremath{-}y}{\mathrm{W}}_{y}){\mathrm{O}}_{6}$ $(0l~yl~1)$ by specific-heat measurements. Critical enhancement of excess low-temperature specific heat with anomalous power law in its T dependence has been observed around the metal-insulator transition, ${y}_{c}\ensuremath{\sim}0.8.$ Such low-energy excitations originate in a random mixture of ferromagnet and antiferromagnet in the face-centered-cubic lattice of the magnetic Fe sites.

Journal

Details 詳細情報について

Report a problem

Back to top