Effects of Co substitution on the structural and magnetic properties of Sr(Ni1-xCox)2P2

Schmidt, J.; Gorgen-Lesseux, G.; Ribeiro, R. A.; Bud'ko, S. L.; Canfield, P. C.

doi:10.1103/physrevb.108.174415

Effects of Co substitution on the structural and magnetic properties of Sr ( Ni 1-x Cox ) 2 P2

Journal Article · Wed Nov 08 23:00:00 EST 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.174415· OSTI ID:2222449

^[1]; Gorgen-Lesseux, G. ^[1]; Ribeiro, R. A. ^[1]; ^[1]; ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)

Although SrNi₂P₂ adopts the common ThCr₂Si₂ structure for T ≥ 325 K, being in an uncollapsed tetragonal state rather than a collapsed tetragonal version, it is a special case for the ThCr₂Si₂ class: on cooling below 325 K it adopts a one-third collapsed orthorhombic phase where one out of every three P rows bonds across the Sr layers. On the other hand, SrCo₂P₂ only exhibits the uncollapsed ThCr₂Si₂ structure from room temperature down to 1.8 K. Regardless of their low-temperature structures, neither SrNi₂P₂ nor SrCo₂P₂ manifests magnetic transitions down to 50 mK and 2 K, respectively. In this work we report the effects of Co substitution in Sr(Ni_{1 - x}Co_x)₂P₂, which allows for tuning the transition between the one-third collapsed and the uncollapsed structure. We find a rapid decrease of the one-third collapsed structural transition temperature with increasing Co fraction, until reaching full suppression for x ≥ 0.1. Substitution levels in the range 0.11 ≤ x ≤ 0.58 show no signs of any transition down to 1.8 K in the magnetization or resistance measurements in the range 1.8 ≤ T ≤ 300 K. However, different magnetically ordered states emerge for x ≥ 0.65, and disappear for x ≥ 0.99, recovering the known paramagnetic properties of the parent compound SrCo₂P₂. Further, these results are summarized in a phase diagram, built upon the characterization by energy dispersive x-ray spectroscopy, x-ray diffraction, temperature-dependent resistance, and field- and temperature-dependent magnetization measurements done on single crystals with different Co fraction. Both the magnetic and structural properties are compared to other systems with ThCr₂Si₂ structure that exhibit magnetic ordering and collapsed tetragonal transitions. The magnetic ordering and moment formation are well described by Takahashi's spin fluctuation theory of itinerant electron magnetism.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2222449

Alternate ID(s):: OSTI ID: 2205370

Report Number(s):: IS-J--11,209

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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