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We report measurements of the magnetic susceptibility of twinned singlecrystals of YBa$_{2}$Cu$_{3}$O$_{6+x}$ from just above their superconductingtransition temperatures to 300 K with magnetic fields of up to 5 T appliedparallel and perpendicular to the CuO$_2$ planes at 7 values of $x$.Appropriate analysis allows the relatively small, but still important, Curieterms to be separated from other contributions to the susceptibility. Our datasupport a picture in which the Curie terms arise from oxygen disorder in theCu-O chains. This agrees with published work on polycrystalline samples wherethe sample cooling rate was varied, but here we show that the Curie plotsflatten out above 200 K. We identify small effects of charge density wave (CDW)instabilities in the temperature ($T$) derivative of the in-planesusceptibility $d\chi_{ab}(T)/dT$ and discuss their $x$-dependence. For$x=$0.67 we make a detailed comparison with published high energy X-raydiffraction data using a minimal model involving Fermi arcs, thereby obtainingvalues for the CDW energy gap and the Helmholtz free energy in a coherencevolume. At 80 and 100 K the latter is comparable with, or smaller than $k_BT$respectively, highlighting the probable importance of thermal fluctuations. Wenote that the effect of the Lorentz force on charge carriers in the Fermi arcscould provide a simple mechanism for enhancing the CDWs in high magneticfields, as suggested by recent experiments.

The magnetic susceptibility of YBa$_{2}$Cu$_{3}$O$_{6+x}$ crystals: unusual Curie behavior and small contributions from charge density waves