Proximity effects in the superconductor/heavy-fermion bilayer system Nb/CeCu6

A. Otop; G.R. Boogaard; R.W.A. Hendrikx; M.B.S. Hesselberth; C. Ciuhu; A. Lodder; Jan Aarts

doi:10.1209/epl/i2003-00138-7

Proximity effects in the superconductor/heavy-fermion bilayer system Nb/CeCu6

A. Otop
, G.R. Boogaard
, R.W.A. Hendrikx
, M.B.S. Hesselberth
, C. Ciuhu
, A. Lodder
, Jan Aarts

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

5 Citations (Scopus)

Abstract

We have investigated the proximity effect between a superconductor (Nb) and a "heavy-fermion" system (CeCu₆) by measuring critical temperatures T_c and parallel critical fields H_c2 ^∥(T) of Nb films with varying thickness deposited on 75 nm thick films of CeCu₆, and comparing the results with the behavior of similar films deposited on the normal metal Cu. For Nb on CeCu₆, we find a strong decrease of T_c with decreasing Nb thickness and a finite critical thickness of the order of 10 nm. Also, dimensional crossovers in H_c2^∥(T) are completely absent, in strong contrast with Nb/Cu. Analysis of the data by a proximity effect model based on the Takahashi-Tachiki theory shows that the data can be explained by taking into account both the high effective mass (or low electronic diffusion constant), and the large density of states at the Fermi energy which characterize the heavy-fermion metal.

Original language	English
Pages (from-to)	91-97
Number of pages	7
Journal	Europhysics Letters
Volume	64
Issue number	1
DOIs	https://doi.org/10.1209/epl/i2003-00138-7
Publication status	Published - Oct 2003
Externally published	Yes

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title = "Proximity effects in the superconductor/heavy-fermion bilayer system Nb/CeCu6",

abstract = "We have investigated the proximity effect between a superconductor (Nb) and a {"}heavy-fermion{"} system (CeCu6) by measuring critical temperatures Tc and parallel critical fields Hc2 ∥(T) of Nb films with varying thickness deposited on 75 nm thick films of CeCu6, and comparing the results with the behavior of similar films deposited on the normal metal Cu. For Nb on CeCu6, we find a strong decrease of Tc with decreasing Nb thickness and a finite critical thickness of the order of 10 nm. Also, dimensional crossovers in Hc2∥(T) are completely absent, in strong contrast with Nb/Cu. Analysis of the data by a proximity effect model based on the Takahashi-Tachiki theory shows that the data can be explained by taking into account both the high effective mass (or low electronic diffusion constant), and the large density of states at the Fermi energy which characterize the heavy-fermion metal.",

author = "A. Otop and G.R. Boogaard and R.W.A. Hendrikx and M.B.S. Hesselberth and C. Ciuhu and A. Lodder and Jan Aarts",

year = "2003",

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doi = "10.1209/epl/i2003-00138-7",

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TY - JOUR

T1 - Proximity effects in the superconductor/heavy-fermion bilayer system Nb/CeCu6

AU - Otop, A.

AU - Boogaard, G.R.

AU - Hendrikx, R.W.A.

AU - Hesselberth, M.B.S.

AU - Ciuhu, C.

AU - Lodder, A.

AU - Aarts, Jan

PY - 2003/10

Y1 - 2003/10

N2 - We have investigated the proximity effect between a superconductor (Nb) and a "heavy-fermion" system (CeCu6) by measuring critical temperatures Tc and parallel critical fields Hc2 ∥(T) of Nb films with varying thickness deposited on 75 nm thick films of CeCu6, and comparing the results with the behavior of similar films deposited on the normal metal Cu. For Nb on CeCu6, we find a strong decrease of Tc with decreasing Nb thickness and a finite critical thickness of the order of 10 nm. Also, dimensional crossovers in Hc2∥(T) are completely absent, in strong contrast with Nb/Cu. Analysis of the data by a proximity effect model based on the Takahashi-Tachiki theory shows that the data can be explained by taking into account both the high effective mass (or low electronic diffusion constant), and the large density of states at the Fermi energy which characterize the heavy-fermion metal.

AB - We have investigated the proximity effect between a superconductor (Nb) and a "heavy-fermion" system (CeCu6) by measuring critical temperatures Tc and parallel critical fields Hc2 ∥(T) of Nb films with varying thickness deposited on 75 nm thick films of CeCu6, and comparing the results with the behavior of similar films deposited on the normal metal Cu. For Nb on CeCu6, we find a strong decrease of Tc with decreasing Nb thickness and a finite critical thickness of the order of 10 nm. Also, dimensional crossovers in Hc2∥(T) are completely absent, in strong contrast with Nb/Cu. Analysis of the data by a proximity effect model based on the Takahashi-Tachiki theory shows that the data can be explained by taking into account both the high effective mass (or low electronic diffusion constant), and the large density of states at the Fermi energy which characterize the heavy-fermion metal.

UR - https://www.scopus.com/pages/publications/0141859890

U2 - 10.1209/epl/i2003-00138-7

DO - 10.1209/epl/i2003-00138-7

M3 - Article

SN - 0295-5075

VL - 64

SP - 91

EP - 97

JO - Europhysics Letters

JF - Europhysics Letters

IS - 1

ER -

Proximity effects in the superconductor/heavy-fermion bilayer system Nb/CeCu6

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