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We study finite temperature N=4 Super Yang-Mills (and more general gaugetheories realized on intersecting D3-D7 branes) in the presence of dynamicalmassless fundamental matter fields at finite baryon charge density. Weconstruct the holographic dual charged black hole solutions at first order inthe flavor backreaction but exact in the charge density. The thermodynamicalproperties of the dual gauge theories coincide with the ones found in the usualcharged D7-probe limit and the system turns out to be thermodynamically stable.By analyzing the higher order correction in the flavor backreaction, we providea novel argument for the un-reliability of the charged probe approximation (andthe present solution) in the extremality limit, i.e. at zero temperature.  We then consider scalar mesonic-like bound states, whose spectrum is dual tothat of linearized fluctuations of D7-brane worldvolume fields around ourgravity backgrounds. In particular we focus on a scalar field saturating theBreitenlohner-Freedman bound in the flavorless limit, and coupled to fieldsdual to irrelevant operators. By looking at quasinormal modes of this scalar,we find no signals of instabilities in the regime of validity of the solutions.

Charged D3-D7 plasmas: novel solutions, extremality and stability issues