Crystals, magnetic and electronic properties of a new ThCr2Si2-type BaMn2Bi2 and K-doped compositions

Abstract

This is a report on the new 122 ternary transition-metal pnictide of BaMn2Bi2, which is crystallized from bismuth flux. BaMn2Bi2 adopts ThCr2Si2-type structure (I4/mmm) with a = 4.4902(3) Å and c = 14.687(1) Å; it is antiferromagnetic with anisotropic magnetic susceptibility and semiconducting with a band gap of Eg = 6 meV. Heat capacity result confirms the insulating ground state in BaMn2Bi2 with the electronic residual Sommerfeld coefficient of γ ~ 0. The high temperature magnetization results show that magnetic ordering temperature is TN ~ 400 K. Hole-doping in BaMn2Bi2 via potassium in Ba1-xKxMn2Bi2 results in metallic behavior for x = 0.10(1), 0.32(1) and 0.36(1). With K-doping, more magnetically anisotropic behavior is observed. Although there is a downturn in electrical resistivity and low-field magnetization data below 4 K in > 30%-doped crystals, there is no sign of zero resistance or diamagnetism. This manuscript is a report on new materials of BaMn2Bi2 and Ba1-xKxMn2Bi2 (0 < x < 0.4). Results from powder X-ray diffraction, anisotropic temperature- and field-dependent magnetization, temperature-and field-dependent electrical resistivity, and heat capacity are presented.

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Cited by in corpus (17)

• Group-theoretical classification of multipole order: emergent responses and candidate materials
• Interplay of Dirac electrons and magnetism in AMnBi2 (A=Ca, Sr)
• Magnetic structure and spin excitations in BaMn2Bi2
• Coexistence of Half-Metallic Itinerant Ferromagnetism with Local-Moment Antiferromagnetism in Ba{0.60}K{0.40}Mn2As2
• Crystal, magnetic, and electronic structures, and properties of new BaMnPnF (Pn = As, Sb, Bi)
• Antiferromagnetism in semiconducting SrMn2Sb2 and BaMn2Sb2 single crystals
• Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn2As2
• Large negative magnetoresistance in BaMn${}_2$Bi${}_2$ antiferromagnet
• Itinerant antiferromagnetic BaMn${}_2$Pn${}_2$'s showing both negative and positive magnetoresistances
• First order transition in trigonal structure $\text{Ca}{\text{Mn}}_2{\text{P}}_2$
• Structure-Property Relationship in Layered BaMn2Sb2 and Ba2Mn3Sb2O2
• Large thermopower in the antiferromagnetic semiconductor BaMn${}_2$Bi${}_2$
• Putative hybridization gap in CaMn${}_2$Bi${}_2$ under applied pressure
• BaMn${}_2$P${}_2$: Highest magnetic ordering temperature 122-pnictide compound
• Magnetic-field-induced Anderson localization in orbital selective antiferromagnet BaMn${}_2$Bi${}_2$
• Two superconducting phases and their characteristics in layered BaTi2(Sb1-xBix)2O with x=0.16
• Local-moment magnetism in Mn-based pnictides