Weakly ferromagnetic metallic state in heavily doped Ba<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>K<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>Mn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub

Bao, Jin‐Ke; Jiang, Hao; Sun, Yun‐Lei; Jiao, Wen‐He; Shen, Chengchao; Guo, Hanjie; Chen, Ye; Feng, Chunmu; Yuan, Huiqiu; Xu, Zhu-An; Cao, Guanghan; Sasaki, R.; Tanaka, Toshiki; Matsubayashi, Kazuyuki; Uwatoko, Yoshiya

doi:10.1103/physrevb.85.144523

Cited by 36 publications

(19 citation statements)

References 35 publications

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“…Interestingly, substitution of only 1.6% of K for Ba results in a metallic ground state in BaMn 2 As 2 [45]. Furthermore, itinerant FM occurs in Ba 1−x K x Mn 2 As 2 with x = 0.19 and 0.26 [46] and half-metallic FM behavior is found below the Curie temperature T C ≈ 100 K for 40% K-doped [47] and 60% Rb-doped BaMn 2 As 2 [48]. This itinerant FM [49] is aligned in the ab plane and coexists with the G-type local-moment AFM of the Mn spins aligned along the c axis [50].…”

Section: Introductionmentioning

confidence: 98%

Antiferromagnetism in semiconductingSrMn2Sb2andBaMn2Sb2single crystals

et al. 2018

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Crystals of SrMn 2 Sb 2 and BaMn 2 Sb 2 were grown using Sn flux and characterized by powder and singlecrystal x-ray diffraction, respectively, and by single-crystal electrical resistivity ρ , heat capacity C p , and magnetic susceptibility χ measurements versus temperature T , and magnetization versus field M ( H ) isotherm measurements. SrMn 2 Sb 2 adopts the trigonal CaAl 2 Si 2 -type structure, whereas BaMn 2 Sb 2 crystallizes in the tetragonal ThCr 2 Si 2 -type structure. The ρ ( T ) data indicate semiconducting behaviors for both compounds with activation energies of ≳ 0.35 eV for SrMn 2 Sb 2 and 0.16 eV for BaMn 2 Sb 2 . The χ ( T ) and C p ( T ) data reveal antiferromagnetic (AFM) ordering at T N = 110 K for SrMn 2 Sb 2 and 450 K for BaMn 2 Sb 2 . The anisotropic χ ( T ≤ T N ) data also show that the ordered moments in SrMn 2 Sb 2 are aligned in the hexagonal a b plane, whereas the ordered moments in BaMn 2 Sb 2 are aligned collinearly along the tetragonal c axis. The a b -plane M ( H ) data for SrMn 2 Sb 2 exhibit a continuous metamagnetic transition at low fields 0 < H ≲ 1 T, whereas BaMn 2 Sb 2 exhibits no metamagnetic transitions up to 5.5 T. The χ ( T ) and C p ( T ) data for both SrMn 2 Sb 2 and BaMn 2 Sb 2 indicate strong dynamic short-range AFM correlations above their respective T N up to at least 900 K within a local-moment picture, corresponding to quasi-two-dimensional magnetic behavior. The present results and a survey of the literature for Mn pnictides with the CaAl 2 Si 2 and ThCr 2 Si 2 crystal structures show that the T N values for the CaAl 2 Si 2 -type compounds are much smaller than those for the ThCr 2 Si 2 -type materials. Crystals of SrMn 2 Sb 2 and BaMn 2 Sb 2 were grown using Sn flux and characterized by powder and singlecrystal x-ray diffraction, respectively, and by single-crystal electrical resistivity ρ, heat capacity C p , and magnetic susceptibility χ measurements versus temperature T , and magnetization versus field M(H ) isotherm measurements. SrMn 2 Sb 2 adopts the trigonal CaAl 2 Si 2 -type structure, whereas BaMn 2 Sb 2 crystallizes in the tetragonal ThCr 2 Si 2 -type structure. The ρ(T ) data indicate semiconducting behaviors for both compounds with activation energies of 0.35 eV for SrMn 2 Sb 2 and 0.16 eV for BaMn 2 Sb 2 . The χ (T ) and C p (T ) data reveal antiferromagnetic (AFM) ordering at T N = 110 K for SrMn 2 Sb 2 and 450 K for BaMn 2 Sb 2 . The anisotropic χ (T T N ) data also show that the ordered moments in SrMn 2 Sb 2 are aligned in the hexagonal ab plane, whereas the ordered moments in BaMn 2 Sb 2 are aligned collinearly along the tetragonal c axis. The ab-plane M(H ) data for SrMn 2 Sb 2 exhibit a continuous metamagnetic transition at low fields 0 < H 1 T, whereas BaMn 2 Sb 2 exhibits no metamagnetic transitions up to 5.5 T. The χ (T ) and C p (T ) data for both SrMn 2 Sb 2 and BaMn 2 Sb 2 indicate strong dynamic short-range AFM correlations above their respective T N up to at least 900 K within a local-moment picture, corresponding to quasi-two...

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Section: Introductionmentioning

confidence: 98%

Antiferromagnetism in semiconductingSrMn2Sb2andBaMn2Sb2single crystals

et al. 2018

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“…At ambient pressure, LaMnPO is a localized moment AFM insulator with a Néel temperature (T N ) about 375 K, and the ~ 3.2 μ B per Mn moment align antiferromagnetically in a checkerboard pattern that is stacked along the c axis1516. Like doping studies of BaMn 2 As 2 17181920 and CaMn 2 Sb 2 21, long-ranged AFM order in LaMnPO is also robust upon chemical doping. The substitution of fluorine for oxygen to its solubility limit does not much alter the long-ranged AFM order state in LaMnP(O 1-x F x ), and no metallization is observed1622.…”

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confidence: 94%

Observation of antiferromagnetic order collapse in the pressurized insulator LaMnPO

Guo

Simonson

Sun

et al. 2013

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The emergence of superconductivity in the iron pnictide or cuprate high temperature superconductors usually accompanies the suppression of a long-ranged antiferromagnetic (AFM) order state in a corresponding parent compound by doping or pressurizing. A great deal of effort by doping has been made to find superconductivity in Mn-based compounds, which are thought to bridge the gap between the two families of high temperature superconductors, but the AFM order was not successfully suppressed. Here we report the first observations of the pressure-induced elimination of long-ranged AFM order at ~ 34 GPa and a crossover from an AFM insulating to an AFM metallic state at ~ 20 GPa in LaMnPO single crystals that are iso-structural to the LaFeAsO superconductor by in-situ high pressure resistance and ac susceptibility measurements. These findings are of importance to explore potential superconductivity in Mn-based compounds and to shed new light on the underlying mechanism of high temperature superconductivity.

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“…Although there is no experimental data that confirm AFM ground state of Ba 0.61 K 0.39 Mn 2 Bi 2 and allow to evaluate T N at ambient pressure, magnetization results for Ba 1-x K x Mn 2 As 2 at lower doping level (x ≤ 0.1) show the existence of the AFM ground state above 400 K131721. Moreover, the similar magnetically anisotropic phenomenon is observed in both of Ba 0.9 K 0.1 Mn 2 Bi 2 and Ba 0.68 K 0.32 Mn 2 Bi 2 23.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the layered AFM compounds with higher Neel temperature ( T N ) are believed to be good candidates for the parent compounds of new high- Tc superconductors6. The Mn-pnicitides of Mn-1111 and Mn-122 compounds, such as LaMnPO789, BaMn 2 P 2 101112, BaMn 2 As 2 13141516171819202122 and BaMn 2 Bi 2 232425, are such kinds of compounds, having AFM ground state similar to the parent compounds of cuprates26 and the same crystal structure as Fe-pnictides23. For such similarities, it is reasonably expected that the BaMn 2 Bi 2 might be a parent compound of Mn-based superconductors.…”

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Robust antiferromagnetism preventing superconductivity in pressurized (Ba0.61K0.39)Mn2Bi2

Dai

et al. 2014

Sci Rep

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BaMn2Bi2 possesses an iso-structure of iron pnictide superconductors and similar antiferromagnetic (AFM) ground state to that of cuprates, therefore, it receives much more attention on its properties and is expected to be the parent compound of a new family of superconductors. When doped with potassium (K), BaMn2Bi2 undergoes a transition from an AFM insulator to an AFM metal. Consequently, it is of great interest to suppress the AFM order in the K-doped BaMn2Bi2 with the aim of exploring the potential superconductivity. Here, we report that external pressure up to 35.6 GPa cannot suppress the AFM order in the K-doped BaMn2Bi2 to develop superconductivity in the temperature range of 300 K–1.5 K, but induces a tetragonal (T) to an orthorhombic (OR) phase transition at ~20 GPa. Theoretical calculations for the T and OR phases, on basis of our high-pressure XRD data, indicate that the AFM order is robust in the pressurized Ba0.61K0.39Mn2Bi2. Both of our experimental and theoretical results suggest that the robust AFM order essentially prevents the emergence of superconductivity.

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Weakly ferromagnetic metallic state in heavily doped Ba1−xKxMn2

Cited by 36 publications

References 35 publications

Antiferromagnetism in semiconductingSrMn2Sb2andBaMn2Sb2single crystals

Antiferromagnetism in semiconductingSrMn2Sb2andBaMn2Sb2single crystals

Observation of antiferromagnetic order collapse in the pressurized insulator LaMnPO

Robust antiferromagnetism preventing superconductivity in pressurized (Ba0.61K0.39)Mn2Bi2

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