Neutron diffraction study of magnetic ordering in high pressure phases of rare earth metal holmium

Perreault, Christopher S.; Vohra, Yogesh K.; Santos, A. M. dos; Molaison, Jamie J.

doi:10.1016/j.jmmm.2020.166843

Cited by 8 publications

(12 citation statements)

References 13 publications

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“…The results of T N for Ho at 12.7 and 16.0 GPa were reconsidered as meaningful data in the present study [11]. For Ho, the results by neutron diffraction are also plotted as the reference data [30,31]. Beige and yellow curves with shadows express the trends of T C and T N , respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, in order to investigate the magnetic structure and conclude whether the FM and HM order survive or not under pressure, the neutron diffraction experiments with high accuracy are required. There have already been many pioneering reports of neutron diffraction in Gd [24], Tb [19,[25][26][27], Dy [28,29], and Ho [30,31]. In the future, as more careful experiments, the neutron diffraction experiments for a wider d-spacing region and using a higher energy source under better hydrostatic-pressure conditions are desirable.…”

Section: Discussionmentioning

confidence: 99%

“…The magnetic properties evolution with structural transformations for the six 4 f FM metals were investigated by magnetic measurements (Gd-Ho [11][12][13], Gd [14], and Gd-Tm [15]), electrical resistance measurements (Gd [16][17][18], Tb [18][19][20], Dy [17,18,21], and Er [22,23]), neutron diffraction (Gd [24], Tb [19,[25][26][27], Dy [28,29], and Ho [30,31]), Mössbauer spectroscopy (Dy [32]), and x-ray absorption near the edge structure (Dy [32]).…”

Section: Introductionmentioning

confidence: 99%

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High pressure studies of the T−P phase diagrams of erbium and thulium up to 30 GPa by using ac magnetization experiments

Mito,

Kimura,

Campo

2024

Phys. Rev. B

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The pressure dependence of the magnetic ordering temperatures for lanthanide ferromagnets Er and Tm has been investigated in the pressure region of up to 30 GPa through ac magnetization measurements by employing a superconducting quantum interference device. Six 4 f lanthanide ferromagnets, from Gd to Tm, commonly have successive structural transitions starting from a hexagonal close-packed (hcp) structure under pressure. The experiments reported here have been performed with high sensitivity to allow for a more comprehensive discussion of the magnetostructural correlation when compared to four other 4 f ferromagnets, namely Gd, Tb, Dy, and Ho. Our results conclude that only Er exhibits the increase in ferromagnetic ordering temperature against initial compression among the six lanthanide ferromagnets. The ferromagnetic magnetization anomaly for Er reduces below the detection limit before the structural transformation from Sm-type to the dhcp structures, and that for Tm exhibits similar behavior before the structure transformation from the hcp to Sm-type structures. However, the helimagnetic magnetization anomalies of both Er and Tm remain stable at least within the Sm-type structure below 30 GPa.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High pressure studies of the T−P phase diagrams of erbium and thulium up to 30 GPa by using ac magnetization experiments

Mito,

Kimura,

Campo

2024

Phys. Rev. B

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“…[1][2][3][4] Especially, the GaAs/AlAs SL has received wide attention in the applications of high electron mobility transistor (HEMT) and quantum cascade laser (QCL). [5][6][7][8] However, when the SL materials are used in irradiation environments such as aerospace field, [9] high energy physics field, [10] and nuclear physics field, [11] point defects may appear in GaAs/AlAs SL, resulting in the failure of the SL-based devices. [12,13] Thus, it is important to improve the performance of GaAs/AlAs SL structure under irradiation.…”

Section: Introductionmentioning

confidence: 99%

First-principles study of stability of point defects and their effects on electronic properties of GaAs/AlGaAs superlattice

Feng¹,

Jiang²,

Qiu³

et al. 2022

Chinese Phys. B

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When the GaAs/AlGaAs superlattice-based devices are used under irradiation environments, point defects may be created and ultimately deteriorate their electronic and transport properties. Thus, understanding the properties of point defects like vacancies and interstitials is essential for the successful application of semiconductor materials. In the present study, first-principles calculations are carried out to explore the stability of point defects in GaAs/Al0.5Ga0.5As superlattice and their effects on electronic properties. The results show that the interstitial defects and Frenkel pair defects are relatively difficult to form, while the antisite defects are favorably created generally. Besides, the existence of point defects generally modifies the electronic structure of GaAs/Al0.5Ga0.5As superlattice significantly, and most of the defective SL structures possess metallic characteristics. Considering the stability of point defects and carrier mobility of defective states, we propose an effective strategy that AlAs, GaAs, and AlGa antisite defects are introduced to improve the hole or electron mobility of GaAs/Al0.5Ga0.5As superlattice. The obtained results will contribute to the understanding of the radiation damage effects of the GaAs/AlGaAs superlattice, and provide a guidance for designing highly stable and durable semiconductor superlattice-based electronics and optoelectronics for extreme environment applications.

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“…This could destabilize the HM state giving place to a FM ground state. Hereafter, the magnetic transition temperatures between the FM and HM states and between the HM and the paramagnetic (PM) states are denoted as T C and T N , respectively.The structure of all 4f-lanthanide FM metals is hexagonal closed packed, hcp, with stacking unit ABA at ambient pressure (AP), and exhibit the structural transformations in the sequence hcp (ABA) → Sm-type (ABABCB-CACA) → double-hcp (dhcp) (ABACA) → fcc (ABCA) → trigonal under increasing pressure 6,7 .The evoution of the magnetic properties with the structural transformations in 4f-lanthanide metals has been studied theoretically 8 and reported experimentally by magnetic characterization [9][10][11][12][13] , electrical resistivity 14-20 , neutron diffraction 14,16,[21][22][23][24][25] , X-ray diffraction 26 , and Mössbauer spectroscopy 27 . In particular, neutron diffraction experiments have been successfully employed to study the magnetic phases of Ho metal at high pressures and variable temperatures, as we briefly summarize in the next paragraph.The first neutron scattering experiment in this metal was performed at AP by Koehler et al 28 .…”

mentioning

confidence: 99%

Revisiting the magnetic structure of Holmium at high pressure by using neutron diffraction

Pardo-Sainz,

Cova,

Rodríguez-Velamazán

et al. 2023

Sci Rep

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Low-temperature neutron diffraction experiments at $$P= 8$$ P = 8 GPa have been conducted to investigate the magnetic structures of metallic Holmium at high pressures by employing a long d-spacing high-flux diffractometer and a Paris-Edinburgh press cell inside a cryostat. We find that at $$P=8$$ P = 8 GPa and $$T=5$$ T = 5 K, no nuclear symmetry change is observed, keeping therefore the hexagonal closed packed (hcp) symmetry at high pressure. Our neutron diffraction data confirm that the ferromagnetic state does not exist. The magnetic structure corresponding to the helimagnetic order, which survives down to 5 K, is fully described by the magnetic superspace group formalism. These results are consistent with those previously published using magnetization experiments.

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Neutron diffraction study of magnetic ordering in high pressure phases of rare earth metal holmium

Cited by 8 publications

References 13 publications

High pressure studies of the T−P phase diagrams of erbium and thulium up to 30 GPa by using ac magnetization experiments

High pressure studies of the T−P phase diagrams of erbium and thulium up to 30 GPa by using ac magnetization experiments

First-principles study of stability of point defects and their effects on electronic properties of GaAs/AlGaAs superlattice

Revisiting the magnetic structure of Holmium at high pressure by using neutron diffraction

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