Electronic properties of γ-U and superconductivity of U–Mo alloys

I Tkach; N.-T.H. Kim-Ngan; A D Warren; Thomas Bligh Scott; A. P. Goncalves; L. Havela

doi:10.1016/j.physc.2013.12.003

Electronic properties of γ-U and superconductivity of U–Mo alloys

I Tkach, N.-T.H. Kim-Ngan, A D Warren, Thomas Bligh Scott, A. P. Goncalves, L. Havela

Research output: Contribution to journal › Article (Academic Journal) › peer-review

29 Citations (Scopus)

Abstract

Fundamental electronic properties of γ-Uranium were determined using Mo doping combined with ultrafast (splat) cooling, which allowed stabilization of the bcc structure to low temperatures. The Sommerfeld coefficient γe is enhanced to 16 mJ/mol K2 from 11 mJ/mol K2 for α-U. Magnetic susceptibility remains weak and T-independent, ≈5 × 10−8 m3/mol. The Mo-doped γ-U exhibits a conventional BCS superconductivity with Tc ≈ 2.1 K and critical field exceeding 5 T for 15 at.% Mo. This type of superconductivity is qualitatively different from the one found for pure U splat, which has Tc higher than 1 K but the weak specific heat anomaly proves that it is not real bulk effect

Original language	English
Pages (from-to)	14-20
Number of pages	7
Journal	Physica C: Superconductivity and its Applications
Volume	498
Early online date	28 Dec 2013
DOIs	https://doi.org/10.1016/j.physc.2013.12.003
Publication status	Published - 15 Mar 2014

Keywords

Superconductivity
U–Mo alloys
Electronic properties

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High-resolution scanning electron microscope (HRSEM) EP/K035746/1 and EP/K040340/1
Scott, T. B. (Principal Investigator) & Hallam, K. R. (Principal Investigator)
1/03/13 → …
Project: Research

Cite this

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title = "Electronic properties of γ-U and superconductivity of U–Mo alloys",

abstract = "Fundamental electronic properties of γ-Uranium were determined using Mo doping combined with ultrafast (splat) cooling, which allowed stabilization of the bcc structure to low temperatures. The Sommerfeld coefficient γe is enhanced to 16 mJ/mol K2 from 11 mJ/mol K2 for α-U. Magnetic susceptibility remains weak and T-independent, ≈5 × 10−8 m3/mol. The Mo-doped γ-U exhibits a conventional BCS superconductivity with Tc ≈ 2.1 K and critical field exceeding 5 T for 15 at.% Mo. This type of superconductivity is qualitatively different from the one found for pure U splat, which has Tc higher than 1 K but the weak specific heat anomaly proves that it is not real bulk effect",

keywords = "Superconductivity, U–Mo alloys, Electronic properties",

author = "I Tkach and N.-T.H. Kim-Ngan and Warren, {A D} and Scott, {Thomas Bligh} and Goncalves, {A. P.} and L. Havela",

year = "2014",

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day = "15",

doi = "10.1016/j.physc.2013.12.003",

language = "English",

volume = "498",

pages = "14--20",

journal = "Physica C: Superconductivity and its Applications",

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TY - JOUR

T1 - Electronic properties of γ-U and superconductivity of U–Mo alloys

AU - Tkach, I

AU - Kim-Ngan, N.-T.H.

AU - Warren, A D

AU - Scott, Thomas Bligh

AU - Goncalves, A. P.

AU - Havela, L.

PY - 2014/3/15

Y1 - 2014/3/15

N2 - Fundamental electronic properties of γ-Uranium were determined using Mo doping combined with ultrafast (splat) cooling, which allowed stabilization of the bcc structure to low temperatures. The Sommerfeld coefficient γe is enhanced to 16 mJ/mol K2 from 11 mJ/mol K2 for α-U. Magnetic susceptibility remains weak and T-independent, ≈5 × 10−8 m3/mol. The Mo-doped γ-U exhibits a conventional BCS superconductivity with Tc ≈ 2.1 K and critical field exceeding 5 T for 15 at.% Mo. This type of superconductivity is qualitatively different from the one found for pure U splat, which has Tc higher than 1 K but the weak specific heat anomaly proves that it is not real bulk effect

AB - Fundamental electronic properties of γ-Uranium were determined using Mo doping combined with ultrafast (splat) cooling, which allowed stabilization of the bcc structure to low temperatures. The Sommerfeld coefficient γe is enhanced to 16 mJ/mol K2 from 11 mJ/mol K2 for α-U. Magnetic susceptibility remains weak and T-independent, ≈5 × 10−8 m3/mol. The Mo-doped γ-U exhibits a conventional BCS superconductivity with Tc ≈ 2.1 K and critical field exceeding 5 T for 15 at.% Mo. This type of superconductivity is qualitatively different from the one found for pure U splat, which has Tc higher than 1 K but the weak specific heat anomaly proves that it is not real bulk effect

KW - Superconductivity

KW - U–Mo alloys

KW - Electronic properties

U2 - 10.1016/j.physc.2013.12.003

DO - 10.1016/j.physc.2013.12.003

M3 - Article (Academic Journal)

SN - 0921-4534

VL - 498

SP - 14

EP - 20

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

ER -

Electronic properties of γ-U and superconductivity of U–Mo alloys

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Keywords

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High-resolution scanning electron microscope (HRSEM) EP/K035746/1 and EP/K040340/1

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