Signatures of quantum criticality in hole-doped and chemically pressurized EuFe2As2 single crystals

Jannis Maiwald, H. S. Jeevan, and Philipp Gegenwart
Phys. Rev. B 85, 024511 – Published 5 January 2012

Abstract

We study the effect of hole doping and chemical pressure (isovalent doping) in single crystals of KxEu1xFe2As2 and EuFe2(As1yPy)2, respectively, by measuring the thermopower, S(T), and electrical resistivity, ρ(T). The evolution of S(T) upon doping indicates drastic changes in the electronic configuration at critical values xcr=0.3 and ycr=0.21, respectively, as the spin-density-wave transition is completely suppressed and superconductivity (SC) emerges. For the case of chemical pressure, a comparison with published ARPES measurements indicates a Lifshitz transition at ycr. The temperature dependences S(T)/TlogT and ΔρT observed in the normal state above the SC transition suggest quantum criticality in both systems.

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  • Received 1 November 2011

DOI:https://doi.org/10.1103/PhysRevB.85.024511

©2012 American Physical Society

Authors & Affiliations

Jannis Maiwald*, H. S. Jeevan, and Philipp Gegenwart

  • I. Physikalisches Institut, Georg-August-Universität Göttingen, D-37077 Göttingen, Germany

  • *jmaiwal@gwdg.de

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Vol. 85, Iss. 2 — 1 January 2012

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