Electronic Structure and Magnetism of 3d-Transition Metal Pnictides

Motizuki, Kazuko; Ido, Hideaki; Itoh, Tadaei; Morifuji, Masato

doi:10.1007/978-3-642-03420-6

Cited by 44 publications

(64 citation statements)

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“…Thus, initial gettering of oxygen by Mn 2 (CO) 10 to form phase-pure MnSb may not be sufficient to stabilize this phase in the presence of a continued supply of oxygen, and this will be apparent in reactions conducted at higher temperatures and longer times. 42 Thus, the observed magnetic moment in our case is a fraction of what is expected 17 based on experimental data on bulk samples and on theory. 7 when the optimized reaction compositions, including 80% mole excess of Mn 2 (CO) 10, were allowed to react to higher reaction temperatures and longer reaction times, Sb starts to evolve again despite the presence of excess Mn 2 (CO) 10 .…”

Section: θsupporting

confidence: 50%

Synthesis of colloidal MnSb nanoparticles: consequences of size and surface characteristics on magnetic properties

et al. 2016

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A solution phase methodology was developed for the formation of discrete colloidal MnSb nanoparticles using dimanganesedecacarbonyl and triphenylantimony as the main reaction components. Stoichiometric reactions result in significant Sb impurities, but these can be eliminated by the use of excess Mn reagent, limiting the reaction time, and using a lower temperature (280 °C) relative to that commonly employed for MnP or MnAs synthesis (330-360 °C). The resultant MnSb nanoparticles are, when evidenced by both powder X-ray diffraction and transmission electron microscopy, ca. 14 nm in diameter and exhibit low polydispersity (13±1.7 nm). High Angle Annular Dark Field-Scanning Transmission Electron Microscopy and energy dispersive line scan data revealed that the as-synthesized MnSb nanoparticles are coreshell in nature, having a MnSb core and an amorphous manganese oxide shell. Evidence is presented supporting a pathway for decomposition of MnSb nanoparticles driven by formation of MnO 2 and Sb due to reaction with adventitious O 2 . The MnSb nanoparticles are superparamagnetic at room temperature, and exhibit suppressed moments attributed to surface oxidation arising from the high surface area and intrinsic oxophilicity of Mn. IntroductionBinary and ternary intermetallic compounds formed by combination of 3d transition metals and pnicogens X (X=P, As, Sb or Bi) are of special interest due to their various electronic and magnetic properties. 1 Among transition metal pnictides, manganese arsenide (MnAs), manganese 15 external magnetic field of 100 Oe. The FC plot shows a gradual increase of molar magnetization with decrease of temperature from 320 K which then saturates at temperatures roughly below 50 K. In the ZFC curve, the sample shows a broad maximum in the range of 245-255 K, near the intersection of the FC with the ZFC curve. Collectively, the above behavior suggests superparamagnetic behavior. Under FC conditions, the magnetic moments of the particles are frozen along the direction of applied magnetic field upon cooling, producing saturation at lowtemperature. In contrast, for ZFC samples, the moments are frozen in random orientation at low temperature, and start to align in the field upon heating, reaching a maximum at the blocking temperature,T B , above which superparamagnetic behavior is exhibited, resulting in a drop in magnetization again. The T B depends on the volume of the nanoparticle, the presence of anisotropy (shape or magnetocrystalline), as well as the time-scale of the measurement (~10 -9 s for DC magnetometry). In the present case the peak corresponding to T B is relatively broad suggesting a distribution of values reflecting the polydispersity of the sample. 38 We attribute the irregularity in both FC and ZFC plots around 43 K to a small leak of oxygen into the sample chamber that makes a condensed film of oxygen, resulting a para-antiferromagnetic transition of oxygen around 43 K. 39

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Section: θsupporting

confidence: 50%

Synthesis of colloidal MnSb nanoparticles: consequences of size and surface characteristics on magnetic properties

et al. 2016

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“…Combined the above two facts, it can be understood that why CrP is not a superconductor. Compared to Pauli paramagnetism observed in CrP [5], WP exhibits diamagnetism in a broad range near room temperature [10], this implies that the band structure effect decrease the effective mass m* and Landau diamagnetism dominates the magnetic susceptibility.…”

Section: Resultsmentioning

confidence: 94%

Superconductivity in WP single crystals

Liu

Zhao

et al. 2019

Phys. Rev. B

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We report the discovery of superconductivity on high-quality single crystals of transition-metal pnictides WP grown by chemical vapor transport (CVT) method.Bulk superconductivity is observed at T c = 0.84 K under ambient pressure by electrical resistivity and AC magnetic susceptibility measurements. The effects of magnetic field on the superconducting transitions are studied, leading to a large anisotropy parameter around 2 with the in-plane and out-of-plane upper critical fields of 2,∥ =172 Oe and 2,⊥ =85 Oe, respectively. Our finding demonstrates that WP is the first superconductor in 5d transition-metal at ambient pressure in MnP-type, which will help to search for new superconductors in transition-metal pnictides.

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“…A notable case of a striking linear MR is found in BaFe 2 (As 1−x P x ) 2 near the antiferromagnetic quantum critical point [8], where non-Fermi liquid behaviour in the temperature (T ) dependence of the resistivity (ρ) has also been observed [9], leading to a phenomenological model to describe the electrical transport with a scattering rate that is proportional to the quadrature sum of magnetic field and temperature [8]. To develop the concept further, it is important to study other strongly correlated electron systems near magnetic instability to expand the material base for detailed in-field investigations.CrAs undergoes a strong first-order transition at T N = 265 K into an antiferromagnetic state, in which the spins assume a double helical structure (winding axis c-axis) [10,11]. This antiferromagnetic state can be completely suppressed by applying 7 kbar [12,13], or by substituting 5% of phosphorous for arsenic, i.e.…”

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confidence: 99%

“…CrAs undergoes a strong first-order transition at T N = 265 K into an antiferromagnetic state, in which the spins assume a double helical structure (winding axis c-axis) [10,11]. This antiferromagnetic state can be completely suppressed by applying 7 kbar [12,13], or by substituting 5% of phosphorous for arsenic, i.e.…”

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Quasilinear quantum magnetoresistance in pressure-induced nonsymmorphic superconductor chromium arsenide

Niu

Yip

et al. 2017

Nat Commun

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In conventional metals, modification of electron trajectories under magnetic field gives rise to a magnetoresistance that varies quadratically at low field, followed by a saturation at high field for closed orbits on the Fermi surface. Deviations from the conventional behaviour, for example, the observation of a linear magnetoresistance, or a non-saturating magnetoresistance, have been attributed to exotic electron scattering mechanisms. Recently, linear magnetoresistance has been observed in many Dirac materials, in which the electron–electron correlation is relatively weak. The strongly correlated helimagnet CrAs undergoes a quantum phase transition to a nonmagnetic superconductor under pressure. Here we observe, near the magnetic instability, a large and non-saturating quasilinear magnetoresistance from the upper critical field to 14 T at low temperatures. We show that the quasilinear magnetoresistance may arise from an intricate interplay between a nontrivial band crossing protected by nonsymmorphic crystal symmetry and strong magnetic fluctuations.

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Electronic Structure and Magnetism of 3d-Transition Metal Pnictides

Cited by 44 publications

References 0 publications

Synthesis of colloidal MnSb nanoparticles: consequences of size and surface characteristics on magnetic properties

Synthesis of colloidal MnSb nanoparticles: consequences of size and surface characteristics on magnetic properties

Superconductivity in WP single crystals

Quasilinear quantum magnetoresistance in pressure-induced nonsymmorphic superconductor chromium arsenide

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