Cd and Sn doping effects on Pauli limiting and HFLT state in CeCoIn$_5$

11:15 AM–2:15 PM, Monday, March 16, 2009
Room: 413

Sponsoring Units: DMP DCMP
Chair: Carlos Bolech, Rice University

Abstract ID: BAPS.2009.MAR.B41.9

Abstract: B41.00009 : Cd and Sn doping effects on Pauli limiting and HFLT state in CeCoIn$_5$*

12:51 PM–1:03 PM

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Authors:

R. Movshovich
(Los Alamos National Laboratory, Los Alamos, NM 87544, USA)

Y. Tokiwa
(Los Alamos National Laboratory, Los Alamos, NM 87544, USA)

N. Kurita
(Los Alamos National Laboratory, Los Alamos, NM 87544, USA)

F. Ronning
(Los Alamos National Laboratory, Los Alamos, NM 87544, USA)

E.D. Bauer
(Los Alamos National Laboratory, Los Alamos, NM 87544, USA)

P. Papin
(Los Alamos National Laboratory, Los Alamos, NM 87544, USA)

J.D. Thompson
(Los Alamos National Laboratory, Los Alamos, NM 87544, USA)

A.D. Bianchi
(University of Montreal, Montreal, QC, H3C 3J7 Canada)

J.F. Rauscher
(University of California, Davis, California 95616, USA)

S.M. Kauzlarich
(University of California, Davis, California 95616, USA)

Z. Fisk
(University of California, Davis, California 95616, USA)

I. Vekhter
(Lousiana State University, Baton Rouge, Louisiana 70803, USA)

We investigated the effect of Cd and Sn doping on the superconducting (SC) transition temperature $T_c$, the superconducting critical field $H_{c2}$, and the High-Field-Low- Temperature (HFLT) phase in heavy fermion superconductor CeCoIn$_5$. $T_c$ decreases monotonically for both dopants, whereas $H_{c2}$ rises initially with Cd substitution, while dropping for Sn doping. Analysis of the magnetization data suggests that these effects are caused by weakening of the Pauli limiting in CeCoIn$_5$ with Cd doping, most likely due to changes of susceptibility of the normal state. Both Cd (leading to AFM ground state at higher concentrations) and Sn impurities, at a very low level of a few hundred ppm, suppress the HFLT phase. We interpret these results as supporting the superconducting origin of the HFLT phase.

*Work at Los Alamos National Laboratory was performed under the auspices of the U.S. Department of Energy.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.B41.9

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Bulletin of the American Physical Society

2009 APS March Meeting

Volume 54, Number 1

Monday–Friday, March 16–20, 2009; Pittsburgh, Pennsylvania

Session B41: Heavy Fermion 115 Superconductors

Abstract: B41.00009 : Cd and Sn doping effects on Pauli limiting and HFLT state in CeCoIn$_5$*

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