Magnetic phase diagram of Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$

Abstract

In order to study the phase diagram from a microscopic viewpoint, we have measured wTF- and ZF-${\mu }^{+}$SR spectra for the Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$ powder samples with $x=0$, 0.2, 0.4, 0.5, 0.6, 0.8, and 1. Due to a characteristic time window and spatial resolution of ${\mu }^{+}$SR, the obtained phase diagram was found to be rather different from that determined by magnetization measurements. That is, as $x$ increases from 0, a Pauli-paramagnetic phase is observed even at the lowest $T$ measured (1.8~K) until $x=0.4$, then, a spin-glass like phase appears at $0.5\le x\le 0.6$, and then, a phase with wide field distribution probably due to incommensurate AF order is detected for $x=0.8$, and finally, a commensurate $A$-type AF ordered phase (for $x=1$) is stabilized below $T_{\mathrm{N}}\sim 80$K. Such change is most likely reasonable and connected to the shrink of the $c$-axis length with $x$, which naturally enhances the magnetic interaction between the two adjacent Co planes.

arXiv comment5 pages, 5 figures, conference paper of muSR2014 (accepted for publication)

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
• Lattice collapse and the magnetic phase diagram of Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$
• Anomalous Itinerant-Electron Metamagnetic Transition in the Layered Sr1-xCaxCo2P2 System

Cited by in corpus (1)

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