Physical Review B - Condensed Matter and Materials Physics
Recently reported specific-heat measurements by Nakazawa and Kanoda between 20 and 50 K show no evidence for an expected antiferromagnetic ordering transition in the quasi-two-dimensional (2D) molecular conductor (Formula presented)-(BEDT-TTF)(Formula presented)Cu[N(CN)(Formula presented)]Cl [Y. Nakazawa and K. Kanoda, Phys. Rev. B 53, R8875 (1996)]. Although the absence of an observable transition was taken as evidence for 2D short-range ordering at elevated temperatures, even a small increase in pressure from the application of the grease used to mount the sample would shift this magnetic transition below 20 K. In their paper, Nakazawa and Kanoda erroneously assume that pressure-induced effects can be ruled out by the magnetic-field independence of the low-temperature specific heat below 3 K. In this Comment, we explain why this assumption is invalid. We conclude that specific-heat measurements in the intermediate temperature range of 3-20 K are needed before the absence of a discernible magnetic and/or pressure-induced phase transitions can be asserted.
© 1997 The American Physical Society.
Fortune, Nathanael and Sushko, Yu V., "Comment on “Electronic Structure of Insulating Salts of the-(BEDT-TTF Family Studied by Low-Temperature Specific-Heat Measurements”" (1997). Physics: Faculty Publications, Smith College, Northampton, MA.