Single-Crystal Growth of Metallic Rare-Earth Tetraborides by the Floating-Zone Technique

Brunt, D.; Hatnean, Monica Ciomaga; Petrenko, O. A.; Lees, Martin R.

doi:10.3390/cryst9040211

Cited by 11 publications

(11 citation statements)

References 47 publications

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“…with the molar volume V m = 3.22 × 10 −5 m 3 [19]. Analysis of the experimental specific heat data yields S LT = 0.13(3) J/(mol K).…”

Section: Discussionmentioning

confidence: 99%

“…Single crystals of NdB 4 were grown by the optical floatingzone technique as reported in detail in Ref. [19]. The relative length changes dL i /L i along the crystallographic [001] and [110] directions (space group 127), respectively, were studied on an oriented cuboid-shaped single crystal of dimensions 1.476 × 1.478 × 1.880 mm 3 .…”

Section: Experimental Methodsmentioning

confidence: 99%

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Magnetoelastic coupling and Grüneisen scaling in NdB4

et al. 2021

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We report high-resolution capacitance dilatometry studies on the uniaxial length changes in a NdB 4 single crystal. The evolution of magnetically ordered phases below T N = 17.2 K [commensurate antiferromagnetic phase (cAFM)], T IT = 6.8 K [intermediate incommensurate phase (IT)], and T LT = 4.8 K [low-temperature phase (LT)] is associated with pronounced anomalies in the thermal expansion coefficients. The data imply significant magnetoelastic coupling and evidence of a structural phase transition at T LT . While both cAFM and LT favor structural anisotropy δ between in-plane and out-of-plane length changes, it competes with the IT type of order, i.e., δ is suppressed in that phase. Notably, finite anisotropy well above T N indicates short-range correlations which are, however, of neither cAFM, IT, nor LT type. Grüneisen analysis of the ratio of thermal expansion coefficient and specific heat enables the derivation of uniaxial as well as hydrostatic pressure dependencies. While α/c p evidences a single dominant energy scale in LT, our data imply precursory fluctuations of a competing phase in IT and cAFM, respectively. Our results suggest the presence of orbital degrees of freedom competing with cAFM, and successive evolution of a magnetically and orbitally ordered ground state.

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“…with the molar volume V m = 3.22 × 10 −5 m 3 [19]. Analysis of the experimental specific heat data yields S LT = 0.13(3) J/(mol K).…”

Section: Discussionmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Magnetoelastic coupling and Grüneisen scaling in NdB4

et al. 2021

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“…Tm 11 B 4 single crystals were grown by the floating zone technique detailed in [43,44], using 11 B to minimize neutron absorption. Single-crystal neutron-scattering experiments in an applied field were carried out on the following instruments: the cold neutron diffractometer DMC, the singlecrystal thermal neutron diffractometer ZEBRA, the thermal neutron triple-axis spectrometer EIGER at the Paul Scherrer Institute, and the thermal neutron diffractometer D23 at the Institut Laue-Langevin.…”

Section: Fig 1 the Phase Diagram Of Tmb 4 Based On Magnetization Mementioning

confidence: 99%

Evolution of field-induced metastable phases in the Shastry-Sutherland lattice magnet TmB4

et al. 2020

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The appearance of a plateau in the magnetization of a quantum spin system subject to continuously varying magnetic field invites the identification of a topological quantization. Indeed, the magnetization plateaus at 1/8 and 1/2 of saturation in TmB 4 have been suggested to be intrinsic, resulting from such a topological quantization, or, alternatively, to be metastable phases. By means of neutron-and x-ray-scattering experiments and magnetization measurements, we show that the 1/8 plateau is metastable, arising because the spin dynamics are frozen below T ≈ 4.5 K. Our experiments show that in this part of the phase diagram of TmB 4 , many long-ranged orders with different propagation vectors may appear and coexist, particularly as the applied field drives the system from one plateau to another. The magnetic structures accommodating a magnetization of ≈ 1/8 seem to be particularly favorable, but still only appear if the system has sufficient dynamics to reorganize into a superstructure as it is driven toward the expected plateau. This work demonstrates that TmB 4 represents a model material for the study of slow dynamics, in and out of equilibrium.

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“…The Laue back reflection photos of LYSO:Ce and LYSO:Ce,1.0 atom % Al crystals are shown in Figure d. The diffraction spots in the pictures are clear, indicating that the crystal samples before and after Al 3+ codoping have good crystal quality. − Combined with Laue back reflection photos and XRD spectrum results, it is considered that the sample used for our testing is a single crystal. As shown in Figure e, the EDS analysis shows that the percentages of Lu, Y, Si, and O atoms in the LYSO:Ce,1.0 atom % Al crystal are 23.1, 1.8, 12.7, and 62.4%, respectively, which is in good agreement with the stoichiometric ratio of Lu 1.8 Y 0.2 SiO 5 .…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Scintillation Properties of LYSO:Ce Crystals by Al Codoping

Xue

Chen

Zhao

et al. 2023

Crystal Growth & Design

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Single-crystal lutetium yttrium oxyorthosilicate doped by cerium (LYSO:Ce) has been widely adopted as a scintillator material for radiation detection. The demands from nuclear medical imaging, as well as high-energy physics, are calling for ever-increasing scintillation properties. Here, Al 3+ codoping of LYSO:Ce is realized for the first time, and a series of LYSO:Ce,xAl (x = 0, 0.3, 0.6, and 1.0 atom %) crystals are successfully grown by a micro-pulling down (μ-PD) method. It is found that at x = 0.6 atom %, the overall scintillation properties are simultaneously improved. In particular, the slow component of rise time and the afterglow level are drastically reduced by 350% (from 304 to 86 ps) and an order of magnitude (from 0.2 to 0.02%), respectively. The energy resolution is also enhanced from 16.1 to 10.9%. These results are attributed to the fact that Al 3+ codoping significantly reduces the concentration of traps, accelerates the excited state lifetime of Ce 3+ ions and introduces a faster scintillating luminescence center, Ce 4+ ions. Our LYSO:Ce,0.6 atom % Al crystal offers a gain in the image signal-to-noise ratio of 1.4 over the non-codoped crystal, which will significantly benefit the next-generation time-of-flight positron emission tomography and enable more precise diagnosis of diseases.

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Single-Crystal Growth of Metallic Rare-Earth Tetraborides by the Floating-Zone Technique

Cited by 11 publications

References 47 publications

Magnetoelastic coupling and Grüneisen scaling in NdB4

Magnetoelastic coupling and Grüneisen scaling in NdB4

Evolution of field-induced metastable phases in the Shastry-Sutherland lattice magnet TmB4

Enhancement of Scintillation Properties of LYSO:Ce Crystals by Al Codoping

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