Effect of disorder on quantum phase transition in the double layered ruthenates (Sr 1-xCa x) 3Ru 2O 7

Zhe Qu, Jin Peng, Tijiang Liu, David Fobes, Vlad Dobrosavljević, Leonard Spinu, Z. Q. Mao

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Abstract

(Sr 1-xCa x) 3Ru 2O 7 is characterized by complex magnetic states, spanning from a long-range antiferromagnetically ordered state over an unusual heavy-mass nearly ferromagnetic (NFM) state to an itinerant metamagnetic (IMM) state. The NFM state, which occurs in the 0.4 >x> 0.08 composition range, freezes into a cluster spin glass (CSG) phase at low temperatures. In this article, we present the scaling analyses of magnetization and the specific heat for (Sr 1-xCa x) 3Ru 2O 7 in the 0.4 >x> 0.08 composition range. We find that in a temperature region immediately above the spin freezing temperature T f, the isothermal magnetization M(H) and the temperature dependence of electronic specific heat C e(T) exhibit anomalous power-law singularities; both quantities are controlled by a single exponent. The temperature dependence of magnetization M(T) also displays a power-law behavior, but its exponent differs remarkably from that derived from M(H) and C e(T). Our analyses further reveal that the magnetization data M(H,T) obey a phenomenological scaling law of M(H,T) Hαf(H/Tδ) in a temperature region between the spin freezing temperature T f and the scaling temperature T scaling. T scaling systematically decreases with the decease of Ca content. This scaling law breaks down near the critical concentration x= 0.1 where a CSG-to-IMM phase transition occurs. We discussed these behaviors in term of the effect of disorder on the quantum phase transition.

Original languageEnglish (US)
Article number014434
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number1
DOIs
Publication statusPublished - Jul 30 2012

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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