Quantum critical behavior in an antiferromagnetic heavy-fermion Kondo lattice system (Ce1-xLax)2Ir3Ge5

doi:10.1088/1674-1056/26/1/017401

Abstract

The measurements on temperature dependences of magnetic susceptibility χ(T), specific heat C(T), and electrical resistivity ρ(T) were carried out for the antiferromagnetic (AFM) (Ce_1-xLa_x)₂Ir₃Ge₅ (0≤x≤0.66) system. It was found that the Neel temperature T_N decreases with increasing La content x, and reaches 0 K near a critical content x_cr=0.6. A new phase diagram was constructed based on these measurements. A non-Fermi liquid behavior in ρ(T) and a logT relationship in C(T) were found in the samples near x_cr, indicating them to be near an AFM quantum critical point (QCP) with strong spin fluctuation. Our finding indicates that (Ce_1-xLa_x)₂Ir₃Ge₅ may be a new platform to search for unconventional superconductivity.

Keywords: quantum critical point antiferromagnetic Kondo lattice system (Ce_1-xLa_x)₂Ir₃Ge₅

Received: 22 August 2016
Revised: 28 September 2016
Accepted manuscript online:

PACS:	74.40.Kb	(Quantum critical phenomena)
	75.50.Ee	(Antiferromagnetics)
	74.25.F-	(Transport properties)
	75.20.Hr	(Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions)

Fund:

Project supported by the National Basic Research Program of China (Grant Nos. 2016FYA0300402, 2015CB921004, and 2012CB821404) and the National Natural Science Foundation of China (Grant Nos. 11374261 and 11204059).

Corresponding Authors: Minghu Fang
E-mail: mhfang@zju.edu.cn

Cite this article:

Rajwali Khan, Qianhui Mao(毛乾辉), Hangdong Wang(王杭栋), Jinhu Yang(杨金虎), Jianhua Du(杜建华), Binjie Xu(许彬杰), Yuxing Zhou(周宇星), Yannan Zhang(张燕楠), Bing Chen(陈斌), Minghu Fang(方明虎) Quantum critical behavior in an antiferromagnetic heavy-fermion Kondo lattice system (Ce_1-xLa_x)₂Ir₃Ge₅ 2017 Chin. Phys. B 26 017401

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Quantum critical behavior in an antiferromagnetic heavy-fermion Kondo lattice system (Ce1-xLax)2Ir3Ge5

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Quantum critical behavior in an antiferromagnetic heavy-fermion Kondo lattice system (Ce_1-xLa_x)₂Ir₃Ge₅