Positive curvature in the upper critical field of heavy fermion superconductors

L. E. De Long; D. Togliatti; G. W. Lehman; W. K. Kwok; G. W. Crabtree; K. G. Vandervoort; D. G. Hinks

doi:10.1016/0921-4526(90)90252-P

Positive curvature in the upper critical field of heavy fermion superconductors

L. E. De Long, D. Togliatti, G. W. Lehman, W. K. Kwok, G. W. Crabtree, K. G. Vandervoort, D. G. Hinks

Physics And Astronomy

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

11 Scopus citations

Abstract

New data on the upper critical magnetic field of single crystals of URu₂Si₂ show distinct upward curvature for the field H in the tetragonal basal plane, but not for fields along the tetragonal axis. The data for H<5 T can be explained as a result of the coupling of a multi-component superconducting order parameter with the magnetization of a spin-density wave. Alternatively, an empirical model succesfully applied to UPt₃ and U₆Fe provides an excellent fit of H_c2(T) for URu₂Si₂ over the entire experimental temperature (0.4 K ≤T≤1.5 K) and field (0≤H≤ 8 T) ranges. Our results imply that unconventional superconductivity may occur over a wide interval of electronic effective mass ratio 20 < m^*/m_e < 200.

Original language	English
Pages (from-to)	499-503
Number of pages	5
Journal	Physica B: Condensed Matter
Volume	163
Issue number	1-3
DOIs	https://doi.org/10.1016/0921-4526(90)90252-P
State	Published - Apr 1990

Bibliographical note

Funding Information:
’ Also at the University of Illinois, Chicago, with partial support from Division of Educational Programs, Argonne National Laboratory. * Research supported by a grant from Research Corporation. ‘Research supported by the US Department of Energy, Basic Energy Sciences-Materials Science under Contract #W-31.109.ENG-38.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/0921-4526(90)90252-P

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@article{e45e14db410a45ca86e66e8d6416c57c,

title = "Positive curvature in the upper critical field of heavy fermion superconductors",

abstract = "New data on the upper critical magnetic field of single crystals of URu2Si2 show distinct upward curvature for the field H in the tetragonal basal plane, but not for fields along the tetragonal axis. The data for H<5 T can be explained as a result of the coupling of a multi-component superconducting order parameter with the magnetization of a spin-density wave. Alternatively, an empirical model succesfully applied to UPt3 and U6Fe provides an excellent fit of Hc2(T) for URu2Si2 over the entire experimental temperature (0.4 K ≤T≤1.5 K) and field (0≤H≤ 8 T) ranges. Our results imply that unconventional superconductivity may occur over a wide interval of electronic effective mass ratio 20 < m*/me < 200.",

author = "{De Long}, {L. E.} and D. Togliatti and Lehman, {G. W.} and Kwok, {W. K.} and Crabtree, {G. W.} and Vandervoort, {K. G.} and Hinks, {D. G.}",

note = "Funding Information: {\textquoteright} Also at the University of Illinois, Chicago, with partial support from Division of Educational Programs, Argonne National Laboratory. * Research supported by a grant from Research Corporation. {\textquoteleft}Research supported by the US Department of Energy, Basic Energy Sciences-Materials Science under Contract #W-31.109.ENG-38.",

year = "1990",

month = apr,

doi = "10.1016/0921-4526(90)90252-P",

language = "English",

volume = "163",

pages = "499--503",

number = "1-3",

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T1 - Positive curvature in the upper critical field of heavy fermion superconductors

AU - De Long, L. E.

AU - Togliatti, D.

AU - Lehman, G. W.

AU - Kwok, W. K.

AU - Crabtree, G. W.

AU - Vandervoort, K. G.

AU - Hinks, D. G.

N1 - Funding Information: ’ Also at the University of Illinois, Chicago, with partial support from Division of Educational Programs, Argonne National Laboratory. * Research supported by a grant from Research Corporation. ‘Research supported by the US Department of Energy, Basic Energy Sciences-Materials Science under Contract #W-31.109.ENG-38.

PY - 1990/4

Y1 - 1990/4

N2 - New data on the upper critical magnetic field of single crystals of URu2Si2 show distinct upward curvature for the field H in the tetragonal basal plane, but not for fields along the tetragonal axis. The data for H<5 T can be explained as a result of the coupling of a multi-component superconducting order parameter with the magnetization of a spin-density wave. Alternatively, an empirical model succesfully applied to UPt3 and U6Fe provides an excellent fit of Hc2(T) for URu2Si2 over the entire experimental temperature (0.4 K ≤T≤1.5 K) and field (0≤H≤ 8 T) ranges. Our results imply that unconventional superconductivity may occur over a wide interval of electronic effective mass ratio 20 < m*/me < 200.

AB - New data on the upper critical magnetic field of single crystals of URu2Si2 show distinct upward curvature for the field H in the tetragonal basal plane, but not for fields along the tetragonal axis. The data for H<5 T can be explained as a result of the coupling of a multi-component superconducting order parameter with the magnetization of a spin-density wave. Alternatively, an empirical model succesfully applied to UPt3 and U6Fe provides an excellent fit of Hc2(T) for URu2Si2 over the entire experimental temperature (0.4 K ≤T≤1.5 K) and field (0≤H≤ 8 T) ranges. Our results imply that unconventional superconductivity may occur over a wide interval of electronic effective mass ratio 20 < m*/me < 200.

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VL - 163

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EP - 503

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 1-3

ER -

Positive curvature in the upper critical field of heavy fermion superconductors

Abstract

Bibliographical note

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