### Session F19: Heavy Fermions and Quantum Criticality in 115's

8:00 AM–10:48 AM, Tuesday, March 19, 2013
Room: 321

Chair: Johnpierre Paglione, University of Maryland

Abstract ID: BAPS.2013.MAR.F19.3

### Abstract: F19.00003 : London penetration depth in Ce$_{1-x}$Yb$_x$CoIn$_5$ ($0 \le x \le 0.4$)

8:24 AM–8:36 AM

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#### Authors:

Hyunsoo Kim
(The Ames Laboratory, Ames, IA)

Makariy A. Tanatar
(The Ames Laboratory, Ames, IA)

Ruslan Prozorov
(The Ames Laboratory, Ames, IA)

Benjamin D. White
(Department of Physics, University of California, San Diego, CA)

Ivy K. Lum
(Department of Physics, University of California, San Diego, CA)

M. Brian Maple
(Department of Physics, University of California, San Diego, CA)

The London penetration depth was measured in single crystals of superconducting Ce$_{1-x}$Yb$_{x}$CoIn$_{5}$ ($0\leq x\leq0.4$) by means of a tunnel diode resonator technique operating at 15 MHz in a dilution refrigerator down to 100 mK. Judging from the suppression of the superconducting transition temperature, the superconductivity in CeCoIn$_{5}$ is relatively robust to Yb - substitution on Ce site unlike the substitution with other rare earth elements. On the other hand, the Yb substitution induces a drastic change of the Fermi surface near $x=0.2$, from which one may expect a significant change in properties of superconducting pairing upon doping. Possible evolution of superconducting order parameter in Ce$_{1-x}$Yb$_{x}$CoIn$_{5}$ with increasing $x$ will be discussed based on the results from penetration depth measurements. \\ \\ Work in Ames was supported by the Department of Energy Office of Science, Basic Energy Sciences under Contract No. DE-AC02-O7CH11358. Work in San Diego was supported by the Department of Energy Office of Science (Grant DE-FG02-04-ER46105).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2013.MAR.F19.3