Abstract
The magnetic phase diagram of Sr_{1-x}Ca_xCo_2P_2 as a function of hydrostatic pressure and temperature is investigated by means of high pressure muon spin rotation, relaxation and resonance (mu ^+SR). The weak pressure dependence for the xne 1 compounds suggests that the rich phase diagram of Sr_{1-x}Ca_xCo_2P_2 as a function of x at ambient pressure may not solely be attributed to chemical pressure effects. The x=1 compound on the other hand reveals a high pressure dependence, where the long range magnetic order is fully suppressed at p_{rm{c2}}approx 9.8 kbar, which seem to be a first order transition. In addition, an intermediate phase consisting of magnetic domains is formed above p_{rm{c1}}approx 8 kbar where they co-exist with a magnetically disordered state. These domains are likely to be ferromagnetic islands (FMI) and consist of an high- (FMI-textcircled {1}) and low-temperature (FMI-textcircled {2}) region, respectively, separated by a phase boundary at T_{rm{i}}approx 20 K. This kind of co-existence is unusual and is originating from a coupling between lattice and magnetic degrees of freedoms.
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