New superconducting phases in Mo2Re3Bx-Mo3Re2Bx eutectic

• Autorzy: Andrzejewski B. , Guilmeau E. , Kowalczyk A. , Szlaferek A.
• Konferencja: New Materials for Magnetoelectronics MAG-EL-MAT 2007, Będlewo near Poznań, 7-10 May 2007
• Języki publikacji: EN

Abstrakty

EN

We report on the discovery and on some basic properties of the eutectic alloy composed of two new superconducting phases; Mo2Re3Bx with Tc = 8.7 K and of Mo3Re2Bx with Tc = 6.6 K (where x ??1). The two phases in the eutectic form complex globular structure and areas of locally ordered lamellar patterns. The lamellae are separated by thin interface of excess boron and behave like a regular network of Josephson junctions. Distinct two-step superconducting transition indicates that this eutectic belongs to inhomogeneous systems with no evidence for the proximity effect. The parameters of the dominating Mo3Re2Bx phase are as follows: the lower and the upper critical fields are equal to .mu.0Hc1 = 13 mT and to .mu.0Hc2 = 6.5 T, respectively.This corresponds to the penetration depth .lambda.?= 2040 A, to the coherence length .xi.?= 70 A and to Ginzburg-Landau parameter .kappa.= 29. Linear temperature dependence of Hc2(T) may be due to unconventional mechanism of superconductivity in dominating Mo3Re2Bx phase.

Słowa kluczowe

EN

intermetallic compounds; eutectics; superconductor; critical field

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2007
• Tom: Vol. 25, No. 4
• Strony: 1259--1266
• Opis fizyczny: Bibliogr. 20 poz.

Twórcy

autor

Andrzejewski B.

autor

Guilmeau E.

autor

Kowalczyk A.

autor

Szlaferek A.

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

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