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Magnetic and electronic properties of NaTiSi$_2$O$_6$ in low temperaturephase were studied in the framework of the LDA+U approximation. We stress thatneglecting correlation effects in LSDA calculations one obtains not onlyseveral times smaller value of the band gap, but also fails to describemagnetic properties of NaTiSi$_2$O$_6$. Our LDA+U results confirm formation ofsinglet Ti-Ti dimers in low temperature phase of NaTiSi$_2$O$_6$ driven bycorresponding orbital ordering [J. Phys. Soc. Jpn. 71, 1423 (2002)], butstrongly disagree with the LSDA results and interpretations of Phys. Rev. Lett.93, 036401 (2004).Comment: 1 table. Submitted to Phys. Rev. Lett. as a Commen

physical review letters

Comment on “Sodium Pyroxene<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>NaTiSi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>: Possible Haldane Spin-1 Chain System”

Comment on “Sodium PyroxeneNaTiSi2O6: Possible Haldane Spin-1 Chain System”