Effect of Ni substitution on the fragile magnetic system La5Co2Ge3

Das, Atreyee; Slade, Tyler J.; Khasanov, Rustem; Bud'ko, Sergey L.; Canfield, Paul C.

doi:10.1103/physrevb.110.075141

Effect of Ni substitution on the fragile magnetic system La5 Co2 Ge3

Journal Article · Thu Aug 22 00:00:00 EDT 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.110.075141· OSTI ID:2438332

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Ames Lab., and Iowa State Univ., Ames, IA (United States)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)

La_5⁢Co₂⁢Ge₃ is an itinerant ferromagnet with a Curie temperature T_C of ~3.8K and a remarkably small saturated moment of 0.1µ_B/Co. Here we present the growth and characterization of single crystals of the La₅⁢(Co_1–x⁢Ni_x)₂Ge₃ series for 0.00 ≤ x ≤ 0.186. Here we measured powder x-ray diffraction, composition as well as anisotropic temperature-dependent resistivity, temperature and field-dependent magnetization along with heat capacity on these single crystals. We also measured muon-spin rotation/relaxation (μ⁢SR) for some Ni substitutions (x = 0.027,0.036,0.074) to study the evolution of internal field with Ni substitution. Using the measured data we infer a low temperature, transition temperature-composition phase diagram for La₅⁢(Co_1–x⁢Ni_x)₂Ge₃. We find that T_C is suppressed for low dopings, x ≤ 0.014; whereas for 0.036 ≤ x ≤ 0.186, the samples are antiferromagnetic with a Néel temperature T_N that goes through a weak and shallow maximum (T_N ~ 3.4K for x~0.07) and then gradually decreases to 2.4 K by x = 0.186. For intermediate Ni substitutions, 0.016 ≤ x ≤ 0.027, two transition temperatures are inferred with T_N>T_C. Whereas the T–x phase diagram for La₅⁢(Co_1–x⁢Ni_x)₂Ge₃ and the T–p phase diagram determined for the parent La₅⁢Co₂⁢Ge₃ under hydrostatic pressure are grossly similar, changing from a low-doping or low-pressure ferromagnetic (FM) ground state to a high-doped or high-pressure antiferromagnetic (AFM) state, perturbation by Ni substitution enabled us to identify an intermediate doping regime where both FM and AFM transitions occur.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2438332

Alternate ID(s):: OSTI ID: 2474631

Report Number(s):: IS-J--11,412

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 7 Vol. 110; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Effect of Ni substitution on the fragile magnetic system La5 Co2 Ge3

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