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• W170140609 abstract "A first-order metal-insulator transition with no change in long-range order occurs in the mixed oxides ${({mathrm{V}}_{1ensuremath{-}x}{mathrm{Cr}}_{x})}_{2}{mathrm{O}}_{3}$ with increasing $x (xensuremath{approx}0.01 mathrm{at} 1 mathrm{atm}mathrm{and} 298 ^{ensuremath{circ}}mathrm{K})$ or decreasing pressure (at $ensuremath{approx}10$ kbar for $x=0.04$ at 298 ifmmode^circelsetextdegreefi{}K). In a preliminary letter it was shown that the transition had all the qualitative features expected of a Mott transition, i.e., a transition from band to localized behavior. The present paper reports the detailed experimental results. Single crystals of mixed oxides have been made by reaction of ${mathrm{Cr}}_{2}$${mathrm{O}}_{3}$, ${mathrm{V}}_{2}$${mathrm{O}}_{5}$, and VN in molten KF. Electrical resistivity and powder x-ray diffraction measurements made as a function of temperature and pressure in oxides with $0ensuremath{le}xensuremath{le}0.12$ establish a temperature-pressure-composition phase diagram with three clearly defined phases: metal (M), insulator (I), and antiferromagnetic insulator (AF). The I-M transition is marked by a drop of over two orders of magnitude in the electrical resistivity and a discontinuous decrease in volume of $ensuremath{approx}1.2$% with no change in crystal structure. For $xensuremath{approx}0.01$ the sequence AFensuremath{rightarrow} Mensuremath{rightarrow} I is observed with increasing temperature at 1 atm. At 4.2 K an AFensuremath{rightarrow} M transition occurs with increasing pressure ($P=41ifmmodepmelsetextpmfi{}6$ kbar for $x=0.04$). The phase diagram is compared with other transition-metal oxides, and the differences between the transition in ${mathrm{V}}_{2}$${mathrm{O}}_{3}$ and V${mathrm{O}}_{2}$ are discussed." @default.
• W170140609 created "2016-06-24" @default.
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• W170140609 date "1970-11-01" @default.
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• W170140609 title "Metal-Insulator Transition in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>V</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:mrow…" @default.
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• W170140609 doi "https://doi.org/10.1103/physrevb.2.3734" @default.
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