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The first-order phase transition between dimerized-antiferromagnetic and uniform-antiferromagnetic phases in Cu_(1-x)M_xGeO_3 | | T. Masuda
; I. Tsukada
; K. Uchinokura
; Y. J. Wang
; V. Kiryukhin
; R. J. Birgeneau
; | | Date: |
9 Jun 1999 | | Subject: | Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci | | Abstract: | We have performed detailed magnetic susceptibility measurements as well as synchrotron x-ray diffraction studies to determine the temperature vs concentration ($T$ - $x$) phase diagram of Cu${}_{1-x}$Mg${}_x$GeO${}_3$. We observe clear double peaks in the magnetic susceptibility implying two antiferromagnetic (AF) transition temperatures in samples with Mg concentrations in the range 0.0237 $le x le$ 0.0271. We also observe a drastic change in the inverse correlation length in this concentration range by x-ray diffraction. The drastic change of the AF transition temperature as well as the disappearance of the spin-Peierls (SP) phase have been clarified; these results are consistent with a first-order phase transition between dimerized AF (D-AF) and uniform AF (U-AF) phases as reported by T. Masuda {it et al.} lbrack Phys. Rev. Lett. {f 80}, 4566 (1998)
brack. The $T$ - $x$ phase diagram of Cu${}_{1-x}$Zn${}_x$GeO${}_3$ is similar to that of Cu${}_{1-x}$Mg${}_x$GeO${}_3$, which suggests that the present phase transition is universal for Cu${}_{1-x}M_{x}$GeO${}_3$. | | Source: | arXiv, cond-mat/9906130 | | Services: | Forum | Review | PDF | Favorites | |
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