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원자제어 저차원 전자계 연구단
원자제어 저차원 전자계 연구단
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Thermal and transport properties of U2PtxIr1-xC2

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Title
Thermal and transport properties of U2PtxIr1-xC2
Author(s)
Mingu Kang; Wakeham N.; Ni N.; Bauer E.D.; Jeehoon Kim; Ronning F.
Publication Date
2015-09
Journal
JOURNAL OF PHYSICS-CONDENSED MATTER, v.27, no.36, pp.365702 -
Publisher
IOP PUBLISHING LTD
Abstract
We report thermal and transport properties of U2PtxIr1−xC2 from which a magnetic phase diagram is obtained. Pure U2IrC2 is an antiferromagnet at 6.5 K, whose Néel temperature initially rises to 13.2 K at x = 0.2 and subsequently is suppressed to zero temperature with increasing Pt content near x = 0.6. Heat capacity divided by temperature at x = 0.6 shows an upturn at low temperature, consistent with the expectations of enhanced quantum fluctuations in the presence of an underlying quantum critical point. The entropy after the phonon contribution has been subtracted has a value of 0.24 Rln2 at the Néel temperature of U2IrC2, revealing an itinerant nature of the 5 f electrons in this compound. On the Pt rich side of the phase diagram, superconductivity is suppressed by x = 0.85. The residual resistivity increases by a factor of 10 from pure Pt (x = 1) to x = 0.85 where superconductivity is suppressed to zero. By comparing the phase diagram of Ir doped U2PtC2 with the phase diagram of pressure tuned and Rh doped U2PtC2 we demonstrate the role of electronic tuning in this system. © 2015 IOP Publishing Ltd
URI
https://pr.ibs.re.kr/handle/8788114/1890
ISSN
0953-8984
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
Files in This Item:
2015_22 Journal of physics_강민구(김지훈).pdfDownload

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