Superconductivity of the surface layers of the doped PbTe:Eu crystals

Zayachuk, D.M.; Mikityuk, V. I.; Shlemkevych, V.V.; Kaczorowski, D.; Ilyina, O.S.

doi:10.1016/j.physc.2012.05.018

Cited by 2 publications

(6 citation statements)

References 15 publications

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“…And, finally, in the sample 4, where the whole Eu impurity is a constituent of the complexes, the presence of the superconducting inclusions is expressed especially clearly. These data are in very good agreement with the results of [10] also presented in Table, where these superconducting states were observed for the first time.…”

Section: Discussionsupporting

confidence: 92%

“…The dependence of magnetization on magnetic field, diverging at a field close to 1 kOe and lower under magnetic field changes up and down, as well as the dependence of MS on the specific temperature, decreasing sharply at a temperature only within a narrow temperature range below ~4 K and practically independent of temperature at high temperatures. The dependences are explained by the influence of leadbased inclusions having the properties of type II superconductors at low temperatures [10]. Obviously, here we have the confirmation of the effect revealed in [10].…”

Section: Discussionsupporting

confidence: 78%

“…The dependences are explained by the influence of leadbased inclusions having the properties of type II superconductors at low temperatures [10]. Obviously, here we have the confirmation of the effect revealed in [10]. The present systematic study of the behavior of magnetization and MS of the surface layers of the PbTe:Eu doped ingot provides information about the features of these inclusions formed during the crystal growth.…”

Section: Discussionsupporting

confidence: 76%

“…In our technological experiments, using crystal ingots with the diameter 10 mm, the thickness of the doped surface layer was up to ten micrometers, namely, several deciles of the percent of the crystal radius. We also showed that, within these surface layers inclusions, the passage into a superconducting state can take place on cooling [10]. It has been concluded that these inclusions are most likely Pb-based.…”

Section: Introductionmentioning

confidence: 59%

“…The sample parameters for which the calculated M(H) curves reproduce the experimental dependences in the best way are given in Table. It also provides with the data from [10]. Comparison of the calculated and experimental dependences M(H) on the examples of the samples 1 and 4, fabricated from the beginning and ending parts of the doped ingot, is shown in Figs 3 and 4.…”

Section: Discussionmentioning

confidence: 94%

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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: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 78%