Re-entrant superconductivity in a magnetically ordered superconductor: La1-xGdxRu2

T. E. Jones; J. F. Kwak; E. P. Chock; P. M. Chaikin

doi:10.1016/0038-1098(78)90020-0

Re-entrant superconductivity in a magnetically ordered superconductor: La_1-xGd_xRu₂

T. E. Jones, J. F. Kwak, E. P. Chock, P. M. Chaikin

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

Abstract

We have measured the critical temperature (T_c) and the upper critical magnetic field (H_c2) of La_1-xGdxRu₂. At low concentrations of the magnetic impurity (Gd), the suppression of T_c follows the expected Abrikosov-Gorkov (A-G) pair breaking curve. However, for larger concentrations, strong deviations below A-G are observed. Samples in this region (4. {similar or less-than} × {similar or less-than} 5. at. %) exhibit two T_c's. La_1-xGd_xRu₂ is known to order magnetically, probably as a spin glass, and the magnetic ordering temperature (T_M) has been measured in the normal state. This T_M curve intersects the T_c curve in the concentration range where the T_c curve is re-entrant and we therefore attribute the re-entrant T_c behavior to the magnetic ordering of the Gd³⁺ ions.

Original language	English (US)
Pages (from-to)	209-213
Number of pages	5
Journal	Solid State Communications
Volume	27
Issue number	3
DOIs	https://doi.org/10.1016/0038-1098(78)90020-0
State	Published - Jul 1978

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

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@article{c04353d8d76f42508e50eec8993d906b,

title = "Re-entrant superconductivity in a magnetically ordered superconductor: La1-xGdxRu2",

abstract = "We have measured the critical temperature (Tc) and the upper critical magnetic field (Hc2) of La1-xGdxRu2. At low concentrations of the magnetic impurity (Gd), the suppression of Tc follows the expected Abrikosov-Gorkov (A-G) pair breaking curve. However, for larger concentrations, strong deviations below A-G are observed. Samples in this region (4. {similar or less-than} × {similar or less-than} 5. at. %) exhibit two Tc's. La1-xGdxRu2 is known to order magnetically, probably as a spin glass, and the magnetic ordering temperature (TM) has been measured in the normal state. This TM curve intersects the Tc curve in the concentration range where the Tc curve is re-entrant and we therefore attribute the re-entrant Tc behavior to the magnetic ordering of the Gd3+ ions.",

author = "Jones, {T. E.} and Kwak, {J. F.} and Chock, {E. P.} and Chaikin, {P. M.}",

note = "Funding Information: Research supported by the National Science Foundation through Grant DMR 76-08899 and by the Office of Naval Research through Grants ONR N0014-76-C-I078. Present address: Naval Ocean Systems Center, San Diego, California 92152. Present address: IBM Research Labs, San Jose, California 95193.",

year = "1978",

month = jul,

doi = "10.1016/0038-1098(78)90020-0",

language = "English (US)",

volume = "27",

pages = "209--213",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Ltd",

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T1 - Re-entrant superconductivity in a magnetically ordered superconductor

T2 - La1-xGdxRu2

AU - Jones, T. E.

AU - Kwak, J. F.

AU - Chock, E. P.

AU - Chaikin, P. M.

N1 - Funding Information: Research supported by the National Science Foundation through Grant DMR 76-08899 and by the Office of Naval Research through Grants ONR N0014-76-C-I078. Present address: Naval Ocean Systems Center, San Diego, California 92152. Present address: IBM Research Labs, San Jose, California 95193.

PY - 1978/7

Y1 - 1978/7

N2 - We have measured the critical temperature (Tc) and the upper critical magnetic field (Hc2) of La1-xGdxRu2. At low concentrations of the magnetic impurity (Gd), the suppression of Tc follows the expected Abrikosov-Gorkov (A-G) pair breaking curve. However, for larger concentrations, strong deviations below A-G are observed. Samples in this region (4. {similar or less-than} × {similar or less-than} 5. at. %) exhibit two Tc's. La1-xGdxRu2 is known to order magnetically, probably as a spin glass, and the magnetic ordering temperature (TM) has been measured in the normal state. This TM curve intersects the Tc curve in the concentration range where the Tc curve is re-entrant and we therefore attribute the re-entrant Tc behavior to the magnetic ordering of the Gd3+ ions.

AB - We have measured the critical temperature (Tc) and the upper critical magnetic field (Hc2) of La1-xGdxRu2. At low concentrations of the magnetic impurity (Gd), the suppression of Tc follows the expected Abrikosov-Gorkov (A-G) pair breaking curve. However, for larger concentrations, strong deviations below A-G are observed. Samples in this region (4. {similar or less-than} × {similar or less-than} 5. at. %) exhibit two Tc's. La1-xGdxRu2 is known to order magnetically, probably as a spin glass, and the magnetic ordering temperature (TM) has been measured in the normal state. This TM curve intersects the Tc curve in the concentration range where the Tc curve is re-entrant and we therefore attribute the re-entrant Tc behavior to the magnetic ordering of the Gd3+ ions.

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VL - 27

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JO - Solid State Communications

JF - Solid State Communications

IS - 3

ER -

Re-entrant superconductivity in a magnetically ordered superconductor: La_1-xGd_xRu₂

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