Abstract
Single crystals of SrxMo6S8 with different strontium concentrations (x<or=1.0) have been grown, and their transport properties studied under zero and applied pressure. The structural transition from a high-temperature rhombohedral symmetry towards a low-temperature triclinic structure is strongly sample dependent, and is clearly inhibited by the 'chemical pressure' set up by the strontium vacancies in the lattice. However, this effect is not strong enough to completely suppress the structural transition, and further application of an external pressure is necessary to attain the superconducting state (Tc>10 K under 20 kbar). The structural transition (Ts) and superconducting critical (Tc) temperatures under pressure for stoichiometric and substoichiometric samples can be described by the same curve, if chemical pressure is taken into account. Comparison is made with EuMo6S8 and related compounds where the cations are magnetic.
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