Pressure driven magnetic order in Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$

Abstract

The magnetic phase diagram of Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$ 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 $x\ne 1$ compounds suggests that the rich phase diagram of Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$ as a function of $x$ at ambient pressure may not only be attributed to solely 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 $p_{c2}\approx 9.8$~kbar, which seem to be a first order transition. In addition, an intermediate phase consisting of dilute ferromagnetic islands (FMI) is formed above $p_{c1}\approx 8$~kbar where they co-exist with a magnetically disordered state. Moreover, such FMI phase seems to consist of an high- (FMI-\textcircled{\small{1}}) and low-temperature (FMI-\textcircled{\small{2}}) region, respectively, separated by a phase boundary at $T_{\mathrm{i}}\approx 20$~K.

10 pages, 8 figures

References in corpus (6)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Competing magnetic ground states in non-superconducting Ba(Fe1-xCrx)2As2
• Co-existence of short- and long-range magnetic order in LaCo${}_2$P${}_2$

Cited by in corpus (1)

• Perspective on the muon-spin rotation/relaxation under hydrostatic pressure