High-pressure measurements at moderate temperatures in a diamond anvil cell with a new optical sensor: SrB4O7:Sm2+

Lacam, A.; Chateau, C.

doi:10.1063/1.343884

Cited by 124 publications

(71 citation statements)

References 11 publications

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“…Sm-doped SrB 4 O 7 was used as a temperatureinsensitive pressure calibrant. 19,20 Diffraction data were collected on ID9A at the ESRF, Grenoble, using a wavelength of 41.34 pm. During exposure, samples were oscillated by six degrees in order to enhance powder statistics.…”

Section: Methodsmentioning

confidence: 99%

Effect of pressure on the magnetostructural transition inSrFe2As2

et al. 2008

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We present a systematic pressure study of poly-and single crystalline SrFe2As2 by electrical resistivity and X-ray diffraction measurements. SrFe2As2 exhibits a structural phase transition from a tetragonal to an orthorhombic phase at T0 = 205 K. The structural phase transition is intimately linked to a spin-density-wave transition taking place at the same temperature. Our pressure experiments show that T0 shifts to lower temperatures with increasing pressure. We can estimate a critical pressure of 4 to 5 GPa for the suppression of T0 to zero temperature. At pressures above 2.5 GPa the resistivity decreases significantly below Tx ≈ 40 K hinting at the emergence of superconductivity but no zero-resistance state is observed up to 3 GPa.

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Section: Methodsmentioning

confidence: 99%

Effect of pressure on the magnetostructural transition inSrFe2As2

et al. 2008

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“…The R 1 line shift is temperature dependent (Á/Áp = 0.068 Å K À1 ), which can cause systematic errors for overheated samples. In another pressure sensor, SrB 4 O 7 :Sm 2+ , the emission line at 6854 Å is narrower than in ruby, hardly temperature dependent (Á/Áp = 0.001 Å K À1 ), and Áp = 0.3922Á GPa, Á in Å (Lacam & Chateau, 1989;Leger et al, 1990;Datchi et al, 1997).…”

Section: Pressure Calibrationmentioning

confidence: 99%

High-pressure crystallography

Katrusiak

2007

Acta Crystallogr A Found Crystallogr

171

128

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Since the late 1950's, high-pressure structural studies have become increasingly frequent, following the inception of opposed-anvil cells, development of efficient diffractometric equipment (brighter radiation sources both in laboratories and in synchrotron facilities, highly efficient area detectors) and procedures (for crystal mounting, centring, pressure calibration, collecting and correcting data). Consequently, during the last decades, high-pressure crystallography has evolved into a powerful technique which can be routinely applied in laboratories and dedicated synchrotron and neutron facilities. The variation of pressure adds a new thermodynamic dimension to crystal-structure analyses, and extends the understanding of the solid state and materials in general. New areas of thermodynamic exploration of phase diagrams, polymorphism, transformations between different phases and cohesion forces, structureproperty relations, and a deeper understanding of matter at the atomic scale in general are accessible with the high-pressure techniques in hand. A brief history, guidelines and requirements for performing high-pressure structural studies are outlined.

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“…16 At 1.0 GPa, a pressure gradient of the order of 0.5 GPa was observed from the center to the border of the indented region. During the laser processing, no calibrant was used to avoid the contamination of the carbon film.…”

Section: A High Pressure Cellmentioning

confidence: 99%

Processing of amorphous carbon films by ultrafast temperature treatment in a confined geometry

Lenz

Perottoni

Balzaretti

et al. 2001

Journal of Applied Physics

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A pressure cell with an anvil made of sapphire and the other made of tungsten carbide, was constructed to process thin film samples using a high power Nd:YAG pulsed laser, in a regime of ultrafast quenching rate and confined geometry. The sapphire anvil worked as the optical window to the laser beam and also as a good thermal conductor substrate. Thin films of amorphous carbon deposited over copper substrate were processed under pressure by Nd:YAG laser pulses. This process induces the formation of a high temperature region at the sample surface during a very short time interval of the order of the 8 ns laser pulse duration. To avoid the complete evaporation of the film, an external pressure of about 0.5 to 1.0 GPa was applied, confining the sample. With the aid of the nanosecond pulsed laser, absorbed on a very thin film sample, this specially designed apparatus provides the means to produce ultrafast quenching as the formation of a plume is suppressed and heat dissipation is accelerated by the high thermal conductivity of the copper substrate and sapphire anvil. The processed samples were analyzed by microRaman spectroscopy and the results indicated the formation of polyynic carbyne structures, as revealed by the presence of a characteristic Raman peak at about 2150 cm Ϫ1 . Another set of Raman peaks observed at 996, 1116, and 1498 cm Ϫ1 , also appeared when the amorphous carbon film was processed with a sequence of more than three consecutive laser pulses. These peaks, whose general aspect is very similar to that of polyacethylene (C n H n ), could be ascribed to the cumulenic carbyne structure, stabilized by some dispersed copper atoms.

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High-pressure measurements at moderate temperatures in a diamond anvil cell with a new optical sensor: SrB4O7:Sm2+

Cited by 124 publications

References 11 publications

Effect of pressure on the magnetostructural transition inSrFe2As2

Effect of pressure on the magnetostructural transition inSrFe2As2

High-pressure crystallography

Processing of amorphous carbon films by ultrafast temperature treatment in a confined geometry

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