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The "devil's staircase" type phase transition in the quarter-filledspin-ladder compound NaV2O5 has been discovered at low temperature and highpressure by synchrotron radiation x-ray diffraction. A large number oftransitions are found to successively take place among higher-ordercommensurate phases with 2a * 2b * zc type superstructures. The observedtemperature and pressure dependence of modulation wave number qc, defined by1/z, is well reproduced by the Axial Next Nearest Neighbor Ising (ANNNI) model.The qc is suggested to reflect atomic displacements coupled with chargeordering in this system. The experimental fact implies that two competitiveinter-layer interactions between the Ising spins, i.e., the nearest neighborJ1>0 (ferro) and the next nearest neighbor J2<0 (antiferro) along the c-axis,are intrinsic in this compound. A microscopic origin of the inter-layerinteraction is not yet known; however, the nearest neighbor interaction J1>0between the V2O5 layers is especially interesting. It is very surprising thatthe phase transition of such a complicated charge-lattice-spin coupled systemNaV2O5 can be described by the simple ANNNI model.Comment: 4 pages, 4 figure

physical review letters

“Devil’s Staircase”-Type Phase Transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>NaV</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>under High Pressure

“Devil’s Staircase”-Type Phase Transition inNaV2O5under High Pressure