Local moments and symmetry breaking in metallic PrMnSbO

Kimber, Simon A. J.; Hill, A.H.; Zhang, Yu Zhong; Jeschke, Harald O.; Valentí, Roser; Ritter, C.; Schellenberg, Inga; Hermes, Wilfred; Pöttgen, Rainer; Argyriou, D. N.

doi:10.1103/physrevb.82.100412

Cited by 42 publications

(83 citation statements)

References 19 publications

(30 reference statements)

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“…a C-type structure, in which the in-plane Mn spins are antiferromagnetically aligned as in BaMn 2 As 2 , but with the ordered moment in the ab-plane instead of in the c-axis direction, and with ferromagnetic instead of antiferromagnetic alignment between layers. 497 The compound undergoes a tetragonal to orthorhombic transition below 35 K, and the ordered moments at 4 K are 3.69(3) µ B /Mn, similar to that of Mn in BaMn 2 As 2 , and 2.96(3) µ B /Pr. Compounds based on Sr 2 Mn 3 As 2 O 2 are bodycentered-tetragonal (I 4/mmm) with a = 4.14Å and c = 18.82Å for Sr 2 Mn 3 As 2 O 2 and with 2 f.u./unit cell.…”

Section: 165mentioning

confidence: 83%

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides

Johnston

2010

Advances in Physics

1,777

2,075

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The response of the worldwide scientific community to the discovery in 2008 of superconductivity at Tc = 26 K in the Fe-based compound LaFeAsO1−xFx has been very enthusiastic. In short order, other Fe-based superconductors with the same or related crystal structures were discovered with Tc up to 56 K. Many experiments were carried out and theories formulated to try to understand the basic properties of these new materials and the mechanism for Tc. In this selective critical review of the experimental literature, we distill some of this extensive body of work, and discuss relationships between different types of experiments on these materials with reference to theoretical concepts and models. The experimental normal-state properties are emphasized, and within these the electronic and magnetic properties because of the likelihood of an electronic/magnetic mechanism for superconductivity in these materials. Contents

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Section: 165mentioning

confidence: 83%

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides

Johnston

2010

Advances in Physics

1,777

2,075

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“…Various studies of the parent LnMnP nO have shown that the MnP n planes are universally antiferromagnetic [3][4][5][6][7][8][9][10] with in-plane checkerboard magnetic structure similar to the in-plane magnetic ordering in the various Mn-122 compounds. For compounds with moment-bearing rare-earth ions (Ln), a second low temperature magnetic ordering of the rare-earth element (i.e., Ce, Nd, and Pr) accompanied by a Mn-spin reorientation transition have been observed [4][5][6][7][8][9]. Other Mn-1111 compounds with variations on the Ln or P n sites have also been shown to order with the same in-plane * yliu@ameslab.gov AFM structure, albeit with uniform or alternate stacking of the AFM planes [11,12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Ca-doped LaMnAsO

Liu

Straszheim

Das

et al. 2018

Phys. Rev. Materials

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We report on our attempt to hole-dope the antiferromagnetic semiconductor LaMnAsO by substitution of the La3+ site by Ca2+. We use neutron and x-ray diffraction, magnetic susceptibility, and transport techniques to characterize polycrystalline (La1−xCax)MnAsO samples prepared by solid-state reaction and find that the parent compound is highly resistant to substitution with an upper limit x≤0.01. Magnetic susceptibility of the parent and the x=0.002(xnom=0.04) compounds indicate a negligible presence of magnetic impurities (i.e., MnO or MnAs). Rietveld analysis of neutron and x-ray diffraction data shows the preservation of both the tetragonal (P4/nmm) structure upon doping and the antiferromagnetic ordering temperature, TN=355±5 K. We report on our attempt to hole-dope the antiferromagnetic semiconductor LaMnAsO by substitution of the La 3+ site by Ca 2+ . We use neutron and x-ray diffraction, magnetic susceptibility, and transport techniques to characterize polycrystalline (La 1−x Ca x )MnAsO samples prepared by solid-state reaction and find that the parent compound is highly resistant to substitution with an upper limit x 0.01. Magnetic susceptibility of the parent and the x = 0.002 (x nom = 0.04) compounds indicate a negligible presence of magnetic impurities (i.e., MnO or MnAs). Rietveld analysis of neutron and x-ray diffraction data shows the preservation of both the tetragonal (P 4/nmm) structure upon doping and the antiferromagnetic ordering temperature, T N = 355 ± 5 K.

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“…The origin of the spin reorientation transition in the square lattice of Mn ions is apparently related to the presence of f moments above and below the Mn lattice, because it exists in neither LaMnAsO nor BaMn 2 As 2 6,9) but in NdMnAsO and PrMnSbO [7][8][9] and probably in CeMnAsO. We have recently 9 studied another related compound, CeCrAsO, and observed a very similar transition at 36 K in magnetic susceptibility and heat capacity, which may be due to a spin reorientation transition.…”

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confidence: 99%

“…[7][8][9] However, the temperature evolution of the Nd/Pr moments reported is quite unusual: for Nd, a steep increase at 25-20 K is followed by a gradual increase to a saturation at approximately 4 K. 7) This suggests that the moments are generated by the internal field from the reoriented Mn moments and that Nd/Pr moments also undergo parasitic spins in the present family of compounds are an interesting topic for investigation in our future work, 18) and should be sufficiently strong to generate sizable internal fields at the f-spin site and to overcome the geometrical frustration.…”

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confidence: 99%

A Magnetic Transition Probed by the Ce Ion in Square-Lattice Antiferromagnet CeMnAsO

et al. 2011

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We examined the magnetic properties of the square-lattice antiferromagnets CeMnAsO and LaMnAsO and their solid solutions La 1-x Ce x MnAsO by resistivity, magnetic susceptibility, and heat capacity measurements below room temperature. A first-order phase transition is observed at 34.1 K, below which the ground-state doublet of the Ce ion splits by 3.53 meV. It is likely that Mn moments already ordered above room temperature are reoriented at the transition, as reported for related compounds, such as NdMnAsO and PrMnSbO. This transition generates a large internal magnetic field at the Ce site in spite of the fact that simple Heisenberg interactions should be cancelled out at the Ce site owing to geometrical frustration. The transition takes place at nearly the same temperature with the substitution of La for Ce up to 90%. The Ce moment does not undergo long-range order by itself, but is parasitically induced at the transition, serving as a good probe for detecting the magnetism of Mn spins in a square lattice.KEYWORDS: CeMnAsO, LaMnAsO, magnetic susceptibility, specific heat, phase transition, magnetic order, spin reorientation transition * E-mail address: hiroi@issp.u-tokyo.ac.jp After the discovery of iron arsenide oxide superconductors, 1) a search for related compounds has been extensively carried out, fruitfully resulting in a large family of compounds including many iron-based superconductors.2) A common playground for superconductivity is a square lattice made up of Fe 2+ ions, which is to be compared with the square lattice of Cu 2+ ions in cupric oxide superconductors. In spite of the similarity in their lattice symmetries, the electronic properties of the parent compounds of these superconductors are very different: the former is a semimetal, while the latter is a Mott insulator. In view of the prominent role of the square lattices of Cu 2+ and Fe 2+ ions in superconductivity, it is of interest and importance to examine square lattice systems made up of transition-metal ions other than Cu 2+ and Fe 2+ .In the present work, we focus on two Mn compounds, CeMnAsO and LaMnAsO, which crystallize in the ZrCuSiAs structure possessing a square lattice made up of Mn 2+ ions (Fig. 1).

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Local moments and symmetry breaking in metallic PrMnSbO

Cited by 42 publications

References 19 publications

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides

Synthesis and characterization of Ca-doped LaMnAsO

A Magnetic Transition Probed by the Ce Ion in Square-Lattice Antiferromagnet CeMnAsO

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