Mechanism of stabilization of the Sm1 − x Gd x S metallic modification at the pressure-induced semiconductor-metal phase transition

Шаренкова, Н. В.; Каминский, В. В.; Golubkov, A. V.; Romanova, Marina; Stepanov, N. N.

doi:10.1134/s1063783409080307

Cited by 2 publications

(5 citation statements)

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“…A similar effect can be obtained by using gadolinium instead of yttrium as an alloying element. Sharenkova et al [ 43 ], studied Sm 1− x Gd x S single crystals prepared by directed crystallization from the melt. Based on XRD measurements before and after the valence transition, it was substantiated that the decrease of scattering regions—which stem from misfit dislocations—is a crucial factor influencing the transition.…”

Section: Properties Of Smsmentioning

confidence: 99%

“…Based on XRD measurements before and after the valence transition, it was substantiated that the decrease of scattering regions—which stem from misfit dislocations—is a crucial factor influencing the transition. The decrease of the size of the scattering regions is a result rather than a parameter, influencing the final pressure-induced transition in SmS-based materials [ 43 ].…”

Section: Properties Of Smsmentioning

confidence: 99%

“…Nonetheless, the multiplet structure of the 4f 6 ground state of Sm 2+ ion fully touches the Fermi level only at concentrations higher than x c . Overall, the transition in this kind of system takes place upon reaching the concentration x c , where the band gap between 4f and 5d vanishes [ 14 , 43 ].…”

Section: Properties Of Smsmentioning

confidence: 99%

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Samarium Monosulfide (SmS): Reviewing Properties and Applications

2017

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In this review, we give an overview of the properties and applications of samarium monosulfide, SmS, which has gained considerable interest as a switchable material. It shows a pressure-induced phase transition from the semiconducting to the metallic state by polishing, and it switches back to the semiconducting state by heating. The material also shows a magnetic transition, from the paramagnetic state to an antiferromagnetically ordered state. The switching behavior between the semiconducting and metallic states could be exploited in several applications, such as high density optical storage and memory materials, thermovoltaic devices, infrared sensors and more. We discuss the electronic, optical and magnetic properties of SmS, its switching behavior, as well as the thin film deposition techniques which have been used, such as e-beam evaporation and sputtering. Moreover, applications and possible ideas for future work on this material are presented. Our scope is to present the properties of SmS, which were mainly measured in bulk crystals, while at the same time we describe the possible deposition methods that will push the study of SmS to nanoscale dimensions, opening an intriguing range of applications for low-dimensional, pressure-induced semiconductor–metal transition compounds.

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Section: Properties Of Smsmentioning

confidence: 99%

Section: Properties Of Smsmentioning

confidence: 99%

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Samarium Monosulfide (SmS): Reviewing Properties and Applications

2017

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“…Although this behavior was mainly studied in bulk crystals [6,10], we recently managed to observe hysteretic resistance loops in SmS thin films [11]. Another approach to provide a tunable, hysteretic piezoresistive behavior could be the use of alloyed systems [12,13] that shift the energy bands of the primary material (SmS), without inducing the metallic state, leading to reversible switching characteristics upon releasing force. In order to achieve this, SmS can be alloyed with similar materials that have a somewhat wider band gap.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, there are other elements substituting for Sm, which directly promote a chemically triggered transition to the metallic state at ambient conditions. Such elements, for example, are Gd and Y [12,13,17,18], both decreasing the phase transition to even lower pressure. This tunability of the piezoresistive response promotes SmS and alloyed SmS as possible candidates for memory and RF (radio frequency) switching devices [1,2,3,4,19].…”

Section: Introductionmentioning

confidence: 99%

SmS/EuS/SmS Tri-Layer Thin Films: The Role of Diffusion in the Pressure Triggered Semiconductor-Metal Transition

2019

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While SmS thin films show an irreversible semiconductor-metal transition upon application of pressure, the switching characteristics can be modified by alloying with other elements, such as europium. This manuscript reports on the resistance response of tri-layer SmS/EuS/SmS thin films upon applying pressure and on the correlation between the resistance response and the interdiffusion between the layers. SmS thin films were deposited by e-beam sublimation of Sm in an H2S atmosphere, while EuS was directly sublimated by e-beam from EuS. Structural properties of the separate thin films were first studied before the deposition of the final nanocomposite tri-layer system. Piezoresistance measurements demonstrated two sharp resistance drops. The first drop, at lower pressure, corresponds to the switching characteristic of SmS. The second drop, at higher pressure, is attributed to EuS, partially mixed with SmS. This behavior provides either a well-defined three or two states system, depending on the degree of mixing. Depth profiling using x-ray photoelectron spectroscopy (XPS) revealed partial diffusion between the compounds upon deposition at a substrate temperature of 400 °C. Thinner tri-layer systems were also deposited to provide more interdiffusion. A higher EuS concentration led to a continuous transition as a function of pressure. This study shows that EuS-modified SmS thin films are possible systems for piezo-electronic devices, such as memory devices, RF (radio frequency) switches and piezoresistive sensors.

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Mechanism of stabilization of the Sm1 − x Gd x S metallic modification at the pressure-induced semiconductor-metal phase transition

Cited by 2 publications

References 1 publication

Samarium Monosulfide (SmS): Reviewing Properties and Applications

Samarium Monosulfide (SmS): Reviewing Properties and Applications

SmS/EuS/SmS Tri-Layer Thin Films: The Role of Diffusion in the Pressure Triggered Semiconductor-Metal Transition

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