Magnetic Properties of a Single Crystal of Manganese Phosphide

Huber, E. E.; Ridgley, D. H.

doi:10.1103/physrev.135.a1033

Cited by 176 publications

(93 citation statements)

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“…2, lower panel) we obtain an estimation of the Curie temperatures, T C ¼ 294 K, for the GaP:MnP films that is slightly higher than those corresponding to MnP powder (291 K) and to the MnP film (290 K). The almost identical T C 's as well as the similarities in the magnetization curves of powder and thin film forms of MnP, compared to single crystal, [7][8][9][10] indicate that the magnetic signal is mainly due to MnP nanocrystals. The small decrease of the magnetization at the lowest temperatures, which is better seen as a steep increase of the derivative (Fig.…”

Section: A Magnetic Datamentioning

confidence: 82%

“…A remarkable difference is the presence of large coercive fields detected for both MnP film and MnP nanocrystals, at any temperature, compared to the absence of coercive field in the powder, as it occurs in single crystals. 8 perpendicular directions of the magnetic field, both in the plane of the samples; it clearly evidences the in-plane anisotropy in both samples.…”

Section: A Magnetic Datamentioning

confidence: 89%

“…MnP presents a strong biaxial magnetocrystalline anisotropy with its longer axis (a) as the harder magnetic axis, and the shorter (c), the softer. 8 In the absence of external magnetic fields, MnP orders ferromagnetically around room temperature, T C ¼ 291.5 K, and at low temperatures presents a transition to a screw antiferromagnetic structure (helimagnetic) at T N ¼ 47 K. External magnetic fields induce different magnetic phases, at different values of the fields, depending on the field orientation relative to the MnP structure. The richness of the magnetic phase diagram of MnP (Fig.…”

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confidence: 99%

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MnP films and MnP nanocrystals embedded in GaP epilayers grown on GaP(001): Magnetic properties and local bonding structure

Andrés

Espinosa

Prieto

et al. 2011

Journal of Applied Physics

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MnP nanostructures embedded in GaP epilayers, and MnP polycrystalline films, grown from the vapor phase on GaP(001) substrates using metalorganic precursors are compared with bulk MnP. We observe a large increase of the low transition temperature from the ferromagnetic to the antiferromagnetic screw phase, from T N ¼ 47 K for bulk to 82 K for nanocrystals in MnP:GaP films, while the Curie temperature T C, close to room temperature, varies only slightly. A net magnetic moment is measured in the nanocrystals and films at 5 K, as well as large coercive fields, contrary to bulk MnP. X-ray absorption spectroscopy and diffraction show that epilayers and films contain MnP grains in the nanometric range with average Mn-P bond lengths very close to those of bulk MnP. The MnP film lattice parameters are almost identical to bulk values (within 0.5%) and the main crystallographic preferential orientations are those also present in the epilayers but with different relative populations. Overall the local structures of all MnP forms are very similar, except for indications of more disorder in the nanocrystals. Such combined changes of T N and T C are in apparent contradiction with the known response of bulk MnP to strains induced by hydrostatic, uniaxial or chemical pressure. We conclude that the differences in the low temperature magnetic behavior are most probably originated by local structural disorder at the surface of the nanostructures and by finite size effects.

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Section: A Magnetic Datamentioning

confidence: 82%

Section: A Magnetic Datamentioning

confidence: 89%

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confidence: 99%

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MnP films and MnP nanocrystals embedded in GaP epilayers grown on GaP(001): Magnetic properties and local bonding structure

Andrés

Espinosa

Prieto

et al. 2011

Journal of Applied Physics

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“…We found that the TYPE-II layer structures with MnP nanoclusters showed much larger ferromagnetic coupling than the TYPE-I layer structures with MnAs nanoclusters. Clear hysteresis loops were observed up to 305 K. The Curie temperature, T c , of single-crystal MnP binary bulk compounds is about 291 K [15]. A magnetic phase diagram for solid solutions of MnP -MnAs was reported in 1968 [16], and magnetic and structural properties of the MnAs 1-y P y material system have been investigated, mainly for compounds with arsenic rich solid composition such as y < 0.20.…”

Section: Magnetic Properties Of Nanoclustersmentioning

confidence: 99%

Ferromagnetic nanoclusters hybridized in Mn-incorporated GaInAs layers during metal–organic vapour phase epitaxial growth on InP layers under low growth temperature conditions

Hara¹,

Kuramata

2005

Nanotechnology

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We demonstrate the successful formation of ferromagnetic nanoclusters in Mn-incorporated GaInAs layers grown by metal-organic vapour phase epitaxy on InP (100) substrates under low growth temperature conditions below 450 °C. We find that MnAs nanoclusters with NiAs-type hexagonal crystallographic structures, which show ferromagnetic characteristics up to a relatively high temperature of about 305 K, are formed near the layer surfaces of Mn-incorporated GaInAs layers grown at 440 °C. After deposition of undoped InP layers on Mn-incorporated GaInAs layers, MnP nanoclusters with orthorhombic cubic crystallographic structures, in which 7% arsenic is incorporated, are formed in InP layers. The samples with MnP nanoclusters show strong ferromagnetic coupling up to about 305 K, although the Curie temperature of MnP bulk compounds is 291 K. Energy dispersive x-ray spectroscopy (EDS) indicates that Mn concentrations in InP and GaInAs layers surrounding MnP nanoclusters are almost negligible. MnAs nanoclusters are also formed in Mn-incorporated GaAs layers grown under low growth temperature conditions of 450 °C on GaAs (100) substrates. From the results of magnetic characterizations with respect to growth temperatures of the samples, we found that all the Mn-incorporated GaAs layers grown at temperatures below 450 °C showed ferromagnetic behaviour. 61.46.+w, 68.37.Lp, 75.75.+a, 81.15.Gh, [2,3] and so on (for a review, see [1,2]). Almost all of these materials have been grown by low temperature molecular beam epitaxy (LTMBE) or ion implantation of magnetic materials on semiconductors [4]. However, although metal-organic vapour phase epitaxy (MOVPE) is one of the most important and preferred technologies for the fabrication of electronic and photonic semiconductor devices, particularly in a production fashion, there are nevertheless only a few reports on MOVPE growth of III-V DMS materials and FM III-V hybrids [5 -8]. PACS:Magneto-optical devices utilizing the Faraday or Kerr effect for III-V DMS materials or FM III-V hybrids are very promising for realizing monolithic integration of magneto-optical devices such as waveguide-type optical isolators or circulators on the present III-V compound semiconductor-based photonic integrated circuits (PICs). This is because such a material system is compatible with III-V compound semiconductors such as GaAs and InP. In particular, FM III-V hybrids are more suitable because they show strong ferromagnetic coupling even above room temperature. Optical isolators are key devices in optical communication systems for 1.3 or 1.55 µm wavelength bands for reducing the external relative feedback noise in distributed feedback (DFB) lasers integrated on the PICs. Techniques for achieving direct bonding between semiconductors and magneto-optical materials have been proposed [9]. However, no successful monolithic integration of optical isolators using epitaxial growth techniques has been realized so far for the present III-V compound semiconductor-based PICs. Recently, device structures for...

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“…The strong magnetism of Mn is commonly believed to be antagonistic to SC. Therefore, it is highly interesting to explore whether SC can emerge near a magnetic QCP in the Mn-based compounds.The itinerant-electron helimagnet, MnP [13], with a much reduced moment of ∼1.3μ B =Mn has attracted our attention as a good starting point to approach a magnetic instability. At ambient condition, MnP adopts an orthorhombic B31-type structure with lattice constants a ¼ 5.26, b ¼ 3.17, and c ¼ 5.92 Å, respectively [14].…”

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confidence: 99%

Superconductivity with a Twist

Norman

2015

Physics

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We report the discovery of superconductivity on the border of long-range magnetic order in the itinerantelectron helimagnet MnP via the application of high pressure. Superconductivity with T sc ≈ 1 K emerges and exists merely near the critical pressure P c ≈ 8 GPa, where the long-range magnetic order just vanishes. The present finding makes MnP the first Mn-based superconductor. The close proximity of superconductivity to a magnetic instability suggests an unconventional pairing mechanism. Moreover, the detailed analysis of the normal-state transport properties evidenced non-Fermi-liquid behavior and the dramatic enhancement of the quasiparticle effective mass near P c associated with the magnetic quantum fluctuations. DOI: 10.1103/PhysRevLett.114.117001 PACS numbers: 74.70.-b, 74.20.Mn, 74.40.Kb, 74.62.Fj Extensive investigations over the last decade have uncovered the quantum criticality as a universal phenomenon connecting with many difficult problems in modern physics [1,2]. For example, the most distinguished problem of unconventional superconductivity (SC) as found in several distinct superconducting systems including the heavy-fermion, organic, cuprates, and the iron-based superconductors can be generally described in the framework of the antiferromagnetic quantum critical point (QCP) [3][4][5][6]. The close proximity of SC to a magnetic instability suggests that the critical spin fluctuations would play a crucial role for mediating the Cooper pairs [5,7]. On the other hand, to realize a magnetic QCP should provide an effective approach for searching new classes of unconventional superconductors. This is well illustrated by the recent discovery of pressure-induced SC in CrAs [8,9], the first Cr-based unconventional superconductor [10]. This discovery has left manganese (Mn) the only 3d element that does not show SC among any Mn-based compounds, even though a great effort has been devoted recently to explore the possible SC via carrier doping [11] or the application of high pressure [12]. The strong magnetism of Mn is commonly believed to be antagonistic to SC. Therefore, it is highly interesting to explore whether SC can emerge near a magnetic QCP in the Mn-based compounds.The itinerant-electron helimagnet, MnP [13], with a much reduced moment of ∼1.3μ B =Mn has attracted our attention as a good starting point to approach a magnetic instability. At ambient condition, MnP adopts an orthorhombic B31-type structure with lattice constants a ¼ 5.26, b ¼ 3.17, and c ¼ 5.92 Å, respectively [14]. In the absence of a magnetic field, MnP undergoes two successive magnetic transitions upon cooling: [13] a transition from the paramagnetic (PM) to ferromagnetic (FM) state at T C ¼ 291 K, and then a second transition to a double helical state at T s ≈ 50 K. In the FM state, the Mn spins are aligned parallel to the orthorhombic b axis, and the ordered moment is about 1.3μ B =Mn. In the double helical state, the Mn spins rotate in the ab plane with the propagation vector q along the c axis [15]. Earlier hydrostatic pr...

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Magnetic Properties of a Single Crystal of Manganese Phosphide

Cited by 176 publications

References 18 publications

MnP films and MnP nanocrystals embedded in GaP epilayers grown on GaP(001): Magnetic properties and local bonding structure

MnP films and MnP nanocrystals embedded in GaP epilayers grown on GaP(001): Magnetic properties and local bonding structure

Ferromagnetic nanoclusters hybridized in Mn-incorporated GaInAs layers during metal–organic vapour phase epitaxial growth on InP layers under low growth temperature conditions

Superconductivity with a Twist

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