Magnetic-field-tuned quantum criticality of the heavy-fermion system YbPtBi

TitleMagnetic-field-tuned quantum criticality of the heavy-fermion system YbPtBi
Publication TypeJournal Article
Year of Publication2013
AuthorsMun ED, Bud'ko SL, Martin C, Kim H, Tanatar MA, Park JH, Murphy T, Schmiedeshoff GM, Dilley N, Prozorov R, Canfield PC
Journal TitlePhysical Review B
Date Published02
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000314992800001
Keywordsantiferromagnetism, chromium, compound ybbipt, critical-point, phase-transition, resistivity, strongly correlated metals, surface, temperature, transport-properties

In this paper, we present systematic measurements of the temperature and magnetic field dependencies of the thermodynamic and transport properties of the Yb-based heavy fermion YbPtBi for temperatures down to 0.02 K with magnetic fields up to 140 kOe to address the possible existence of a field-tuned quantum critical point. Measurements of magnetic-field- and temperature-dependent resistivity, specific heat, thermal expansion, Hall effect, and thermoelectric power indicate that the AFM order can be suppressed by an applied magnetic field of H-c similar to 4 kOe. In the H-T phase diagram of YbPtBi, three regimes of its low-temperature states emerge: (I) AFMstate, characterized by a spin density wave-like feature, which can be suppressed to T = 0 by the relatively small magnetic field of H-c similar to 4 kOe; (II) field-induced anomalous state in which the electrical resistivity follows Delta(rho)(T) proportional to T-1.5 between H-c and similar to 8 kOe; and (III) Fermi liquid (FL) state in which Delta(rho)(T) proportional to T-2 for H >= 8 kOe. Regions I and II are separated at T = 0 by what appears to be a quantum critical point. Whereas region III appears to be a FL associated with the hybridized 4f states of Yb, region II may be a manifestation of a spin liquid state. DOI: 10.1103/PhysRevB.87.075120

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