The upper critical field in doped MgCNi3

Bartłomiej Andrzejewski; Tomasz Klimczuk; Robert J. Cava

doi:10.1016/j.physc.2007.03.147

The upper critical field in doped MgCNi₃

Bartłomiej Andrzejewski
, Tomasz Klimczuk
, Robert J. Cava

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The upper critical field (H_c2) in the doped and undoped intermetallic superconductor MgCNi₃ is studied. In MgCNi_3-xM_x (M = Ru, Fe), H_c2 decreases monotonically as x increases. In the case of Fe doping, H_c2 changes most dramatically: from 10.7 T at x = 0 to 7.9 T at x = 0.015, which might be caused by the fact that the 3d electrons in Fe break superconducting Cooper-pairs. Although, doping carbon on the boron site in Mg(B_1-xC_x)₂ has a substantial effect on the upper critical field, here we report that for MgC_1-xB_xNi₃, boron substitution slightly increases H_c2 for the lowest B doping level, x = 0.04, only. For x > 0.04 the upper critical field decreases slowly as x increases. The initial slope of H_c2(T) in MgC_0.96B_0.04Ni₃ is nearly the same as that of pure MgCNi₃.

Original language	English (US)
Pages (from-to)	706-707
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	460-462 I
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2007.03.147
State	Published - Sep 1 2007

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Keywords

Critical temperature
Doping
MgCNi
Upper critical field

Access to Document

10.1016/j.physc.2007.03.147

Cite this

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title = "The upper critical field in doped MgCNi3",

abstract = "The upper critical field (Hc2) in the doped and undoped intermetallic superconductor MgCNi3 is studied. In MgCNi3-xMx (M = Ru, Fe), Hc2 decreases monotonically as x increases. In the case of Fe doping, Hc2 changes most dramatically: from 10.7 T at x = 0 to 7.9 T at x = 0.015, which might be caused by the fact that the 3d electrons in Fe break superconducting Cooper-pairs. Although, doping carbon on the boron site in Mg(B1-xCx)2 has a substantial effect on the upper critical field, here we report that for MgC1-xBxNi3, boron substitution slightly increases Hc2 for the lowest B doping level, x = 0.04, only. For x > 0.04 the upper critical field decreases slowly as x increases. The initial slope of Hc2(T) in MgC0.96B0.04Ni3 is nearly the same as that of pure MgCNi3.",

keywords = "Critical temperature, Doping, MgCNi, Upper critical field",

author = "Bart{\l}omiej Andrzejewski and Tomasz Klimczuk and Cava, \{Robert J.\}",

year = "2007",

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doi = "10.1016/j.physc.2007.03.147",

language = "English (US)",

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T1 - The upper critical field in doped MgCNi3

AU - Andrzejewski, Bartłomiej

AU - Klimczuk, Tomasz

AU - Cava, Robert J.

PY - 2007/9/1

Y1 - 2007/9/1

N2 - The upper critical field (Hc2) in the doped and undoped intermetallic superconductor MgCNi3 is studied. In MgCNi3-xMx (M = Ru, Fe), Hc2 decreases monotonically as x increases. In the case of Fe doping, Hc2 changes most dramatically: from 10.7 T at x = 0 to 7.9 T at x = 0.015, which might be caused by the fact that the 3d electrons in Fe break superconducting Cooper-pairs. Although, doping carbon on the boron site in Mg(B1-xCx)2 has a substantial effect on the upper critical field, here we report that for MgC1-xBxNi3, boron substitution slightly increases Hc2 for the lowest B doping level, x = 0.04, only. For x > 0.04 the upper critical field decreases slowly as x increases. The initial slope of Hc2(T) in MgC0.96B0.04Ni3 is nearly the same as that of pure MgCNi3.

AB - The upper critical field (Hc2) in the doped and undoped intermetallic superconductor MgCNi3 is studied. In MgCNi3-xMx (M = Ru, Fe), Hc2 decreases monotonically as x increases. In the case of Fe doping, Hc2 changes most dramatically: from 10.7 T at x = 0 to 7.9 T at x = 0.015, which might be caused by the fact that the 3d electrons in Fe break superconducting Cooper-pairs. Although, doping carbon on the boron site in Mg(B1-xCx)2 has a substantial effect on the upper critical field, here we report that for MgC1-xBxNi3, boron substitution slightly increases Hc2 for the lowest B doping level, x = 0.04, only. For x > 0.04 the upper critical field decreases slowly as x increases. The initial slope of Hc2(T) in MgC0.96B0.04Ni3 is nearly the same as that of pure MgCNi3.

KW - Critical temperature

KW - Doping

KW - MgCNi

KW - Upper critical field

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DO - 10.1016/j.physc.2007.03.147

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