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.

Funding

’ 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.

Funders	Funder number
Basic Energy Sciences-Materials Science	-31.109, ENG-38
Division of Educational Programs
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research Laboratory
Research Corporation for Science Advancement
Argonne National Laboratory

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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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",

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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.

UR - https://www.scopus.com/pages/publications/4243778888

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U2 - 10.1016/0921-4526(90)90252-P

DO - 10.1016/0921-4526(90)90252-P

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SN - 0921-4526

VL - 163

SP - 499

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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