Complex formation and background impurity of Oxygen in the PbTe:Eu doped crystals grown from melt by the Bridgman method

Zayachuk, D.M.; Mikityuk, V. I.; Shlemkevych, V.V.; Kaczorowski, D.

doi:10.1016/j.jcrysgro.2011.09.058

Cited by 4 publications

(10 citation statements)

References 23 publications

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“…6 shows that all the M(H) dependences of the sample 4 can be described very well if assuming that in addition to the crystal matrix and Eu ions its magnetization is determined also by the contribution of paramagnetic centers with the spin ½ . The magnetic-ordered Eu centers such as NN and NNN pairs in PbTe:Eu crystals, where Eu is a doping impurity, are formed mainly by europium and oxygen [12]. We found that the distribution of the Pb-based inclusions inside the surface layers of PbTe:Eu crystals correlated with the distribution of the small Eu complexes.…”

Section: Discussionmentioning

confidence: 71%

“…According to [12,13], M Eu was calculated as the sum of the contributions of single centers M S , the nearest-neighbor (NN) pairs with ferromagnetic interaction M P1 , and the next-nearest-neighbor (NNN) pairs M P2 with antiferromagnetic interaction:…”

Section: Discussionmentioning

confidence: 99%

“…To calculate M S , M P1 , and M P2 , the standard procedure and standard ratios [12,14,15] were used. As the exchange integrals, we used their values for Eu ions in EuO normed by the lattice constant of PbTe: J 1 /k B = 0.056 K for ferromagnetic interaction of the NN pairs and J 1 /k B = K 13 .…”

Section: Discussionmentioning

confidence: 99%

“…As the exchange integrals, we used their values for Eu ions in EuO normed by the lattice constant of PbTe: J 1 /k B = 0.056 K for ferromagnetic interaction of the NN pairs and J 1 /k B = K 13 . 0  for antiferromagnetic interaction of the NNN pairs [12].…”

Section: Discussionmentioning

confidence: 99%

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Magnetic-ordered and superconducting units inside surface layers of PbTe:Eu crystals grown from melt by using the Bridgman method

Zayachuk¹,

Kaczorowski²,

Fedkovich³

2013

Semicond. Phys. Quantum Electron. Optoelectron.

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Presented in this work are the results of the first systematic study of magnetic properties inherent to surface layers of PbTe:Eu crystals grown from melt with a low initial concentration of Eu impurity) (int Eu ml N (about 110 19 cm-3) using the Bridgman method. The magnetic field dependences of magnetization at the temperature 1.72 K and temperature dependences of magnetic susceptibility within the temperature range 1.7 to 10 K of the surface powder samples has been investigated. Inside the surface layers, formation of both small magnetic complexes based on Eu impurity and lead-based inclusions superconducting at low temperatures, which originate in a correlated way during the growth process of doped ingots, has been established. The observed correlations are manifested in a consistent distribution of both europium-based and leadbased units along the lateral surface, where the probability of their formation increases towards the end of the doped ingot. Based on the analysis of the obtained magnetic data, it has been suggested that the lead-based inclusions, being formed within the surface layer of PbTe:Eu crystals during the process of their growth and passing into a superconducting state on cooling, are the type II superconductors with a very high top critical field H c2 at low temperatures. At T = 1.7 K, H c2 of the inclusions is estimated to exceed 50.0 kOe. The important role of the background oxygen impurity in formation of magnetic properties of the surface layers of PbTe:Eu crystals has been suggested.

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Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic-ordered and superconducting units inside surface layers of PbTe:Eu crystals grown from melt by using the Bridgman method

Zayachuk¹,

Kaczorowski²,

Fedkovich³

2013

Semicond. Phys. Quantum Electron. Optoelectron.

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“…Their physical properties are determined by both the intrinsic defects of crystal lattice and the foreign impurities. The impurities of rare earths elements are especially effective in controlling the system of intrinsic defects and other important parameters of these materials [6][7][8][9][10][11]. The use of doping processes requires control of the real distribution of the doping impurities in the doped crystals.…”

Section: Introductionmentioning

confidence: 99%

Growth of Surface Micro- and Nanostructures During Depth Profiling of PbTe Crystals by Ar Plasma

Zayachuk¹,

Слынько²,

Csík³

2017

J. Nano- Electron. Phys.

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Peculiarities of depth profiling of PbTe crystals by Ar plasma with energy of 350 eV at the conditions of Secondary Neutral Mass Spectrometry originated from the crystal growth environment are presented. The crystals grown from vapor phase and from melt by the Bridgman method were studied. The natural faceted surface corresponding to the crystallographic plane of high symmetry (100), the natural lateral surfaces of crystal ingots, and the surfaces processed mechanically during cutting of the crystals were profiled. Nucleation, growth, and re-sputtering of the arrays of micro-and nanoscopic surface structures on the sputtered surfaces as a result of re-deposition of sputtered Pb and Te atoms were observed. It was determined that the growth environment of the PbTe crystal surfaces has a strong effect on nucleation and growth of the surface micro-and nanostructures in the conditions of continuous surface bombardment by Ar ions during depth profiling. This does not prevent the correct determination of the composition of the studied objects via the analysis of the composition of sputtered phase, if sputtering continues for at least 5-10 minutes.

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Segregation of the Eu impurity as function of its concentration in the melt for growing of the lead telluride doped crystals by the Bridgman method

Zayachuk¹,

Ilyina²,

Pashuk³

et al. 2013

Journal of Crystal Growth

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Complex formation and background impurity of Oxygen in the PbTe:Eu doped crystals grown from melt by the Bridgman method

Cited by 4 publications

References 23 publications

Magnetic-ordered and superconducting units inside surface layers of PbTe:Eu crystals grown from melt by using the Bridgman method

Magnetic-ordered and superconducting units inside surface layers of PbTe:Eu crystals grown from melt by using the Bridgman method

Growth of Surface Micro- and Nanostructures During Depth Profiling of PbTe Crystals by Ar Plasma

Segregation of the Eu impurity as function of its concentration in the melt for growing of the lead telluride doped crystals by the Bridgman method

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