Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Separation of Energy Scales in Undoped YbRh2Si2 Under Hydrostatic Pressure
Yoshi TokiwaPhilipp GegenwartChristoph GeibelFrank Steglich
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2009 Volume 78 Issue 12 Pages 123708

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Abstract

The temperature–magnetic field (TH) phase diagram of YbRh2Si2 in the vicinity of its quantum critical point is investigated by low-T magnetization measurements. Our analysis reveals that the energy scale T\\star(H), previously related to the Kondo breakdown and terminating at 0.06 T for T→0, remains unchanged under pressure, whereas the antiferromagnetic critical field increases from 0.06 T (P=0) to 0.29 T (P=1.28 GPa), resulting in a crossing of TN(H) and T\\star(H). Our results are very similar to those on Yb(Rh1−xCox)2Si2, proving that the Co-induced disorder can not be the reason for the detachment of both scales under chemical pressure.

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© The Physical Society of Japan 2009
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