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Recent superconducting transition temperatures (Tc) over 100 K for monolayerFeSe on SrTiO3 have renewed interest in the bulk parent compound. In KCl:AlCl3flux-transport-grown crystals of FeSe0.94Be0.06, FeSe0.97Be0.03 and, forcomparison, FeSe, this work reports doping of FeSe using Be, among the smallestof possible dopants, corresponding to an effective chemical pressure. Accordingto lattice parameter measurements, 6% Be doping shrank the tetragonal FeSelattice equivalent to a physical pressure of 0.75 GPa. Using thisflux-transport method of sample preparation, 6% of Be was the maximum amount ofdopant achievable. At this maximal composition of FeSe0.94Be0.06, the latticeunit cell shrinks by 2.4%, Tc - measured in the bulk via specific heat -increases by almost 10%, the Tc vs pressure behavior shifts its peak Tconsetdownwards by ~1 GPa, the high temperature structural transition around TS = 89K increases by 1.9 K (in contrast to other dopants in FeSe which uniformlydepress TS), and the low temperature specific heat gamma increases by 10 %compared to pure FeSe. Also, upon doping by 6% Be the residual resistivityratio, rho(300K)/rho(T->0), increases by almost a factor of four, whilerho(300K)/rho(T=Tc+) increases by 50%.

Unusual Effects of Be doping in the Iron Based Superconductor FeSe