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

Research output: Contribution to journalArticle

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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
StatePublished - Jul 30 2012

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Phase transitions
disorders
scaling
magnetization
Magnetization
scaling laws
spin glass
freezing
Temperature
Spin glass
temperature
specific heat
exponents
Scaling laws
temperature dependence
Freezing
Specific heat
breakdown
Chemical analysis
electronics

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Qu, Zhe ; Peng, Jin ; Liu, Tijiang ; Fobes, David ; Dobrosavljević, Vlad ; Spinu, Leonard ; Mao, Z. Q. / Effect of disorder on quantum phase transition in the double layered ruthenates (Sr 1-xCa x) 3Ru 2O 7 In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 86, No. 1.
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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.",
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Effect of disorder on quantum phase transition in the double layered ruthenates (Sr 1-xCa x) 3Ru 2O 7 . / Qu, Zhe; Peng, Jin; Liu, Tijiang; Fobes, David; Dobrosavljević, Vlad; Spinu, Leonard; Mao, Z. Q.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 1, 014434, 30.07.2012.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of disorder on quantum phase transition in the double layered ruthenates (Sr 1-xCa x) 3Ru 2O 7

AU - Qu, Zhe

AU - Peng, Jin

AU - Liu, Tijiang

AU - Fobes, David

AU - Dobrosavljević, Vlad

AU - Spinu, Leonard

AU - Mao, Z. Q.

PY - 2012/7/30

Y1 - 2012/7/30

N2 - (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.

AB - (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.

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JF - Physical Review B-Condensed Matter

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