Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-01-28
J. Phys.: Condens. Matter 20, 335208 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 7 figures
Scientific paper
10.1088/0953-8984/20/33/335208
A study by specific heat of a polycrystalline sample of the low-dimensional magnetic system Y$_2$BaCuO$_5$ is presented. Magnetic fields up to 14 T are applied and permit to extract the ($T$,$H$) phase diagram. Below $\mu_0H^*\simeq2$ T, the N\'eel temperature, associated with a three-dimensional antiferromagnetic long-range ordering, is constant and equals $T_N=15.6$ K. Above $H^*$, $T_N$ increases linearly with $H$ and a field-induced increase of the entropy at $T_N$ is related to the presence of an isosbestic point at $T_X\simeq20$ K, where all the specific heat curves cross. A comparison is made between Y$_2$BaCuO$_5$ and the quasi-two-dimensional magnetic systems BaNi$_{2}$V$_{2}$O$_{8}$, Sr$_2$CuO$_2$Cl$_2$, and Pr$_2$CuO$_4$, for which very similar phase diagrams have been reported. An effective field-induced magnetic anisotropy is proposed to explain these phase diagrams.
Inaba A.
Knafo William
Löhneysen Hilbert v.
Meingast Christoph
Wolf Th.
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