Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates

J. Peng, X.M. Gu, G.T. Zhou, W. Wang, J.Y. Liu, Y. Wang, Z.Q. Mao, X.S. Wu, S. Dong

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present a detailed investigation of the specific heat of Ca 3 (Ru 1-x M x ) 2 O 7 (M = Ti, Fe, Mn) single crystals. Depending on the dopant and doping level, three distinct regions are present: a quasitwo-dimensional metallic state with antiferromagnetic (AFM) order formed by ferromagnetic bilayers (AFM-b), a Mott insulating state with G-type AFM order (G-AFM), and a localized state with a mixed AFM-b and G-AFM phase. Our specific heat data provide deep insights into the Mott transitions induced by Ti and Mn doping. We observed not only an anomalous large mass enhancement, but also an additional term in the specific heat, i.e., C \ T 2 , in the localized region. The C \ T 2 term is most likely due to long-wavelength excitations with both FM and AFM components. A decrease in the Debye temperature is observed in the G-type AFM region, indicating lattice softening associated with the Mott transition. \ 2018, Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Original languageEnglish
JournalFrontiers of Physics
Volume13
Issue number4
DOIs
StatePublished - 2018

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Magnetic separation
electron mass
Phase Separation
Specific Heat
Phase separation
Specific heat
Enhancement
Hot Temperature
Doping (additives)
specific heat
Electrons
Electron
augmentation
Debye temperature
Order Type
Softening
Term
Single Crystal
Higher Education
Anomalous

Cite this

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title = "Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates",
abstract = "We present a detailed investigation of the specific heat of Ca 3 (Ru 1-x M x ) 2 O 7 (M = Ti, Fe, Mn) single crystals. Depending on the dopant and doping level, three distinct regions are present: a quasitwo-dimensional metallic state with antiferromagnetic (AFM) order formed by ferromagnetic bilayers (AFM-b), a Mott insulating state with G-type AFM order (G-AFM), and a localized state with a mixed AFM-b and G-AFM phase. Our specific heat data provide deep insights into the Mott transitions induced by Ti and Mn doping. We observed not only an anomalous large mass enhancement, but also an additional term in the specific heat, i.e., C \ T 2 , in the localized region. The C \ T 2 term is most likely due to long-wavelength excitations with both FM and AFM components. A decrease in the Debye temperature is observed in the G-type AFM region, indicating lattice softening associated with the Mott transition. \ 2018, Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature.",
author = "J. Peng and X.M. Gu and G.T. Zhou and W. Wang and J.Y. Liu and Y. Wang and Z.Q. Mao and X.S. Wu and S. Dong",
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Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates. / Peng, J.; Gu, X.M.; Zhou, G.T.; Wang, W.; Liu, J.Y.; Wang, Y.; Mao, Z.Q.; Wu, X.S.; Dong, S.

In: Frontiers of Physics, Vol. 13, No. 4, 2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates

AU - Peng, J.

AU - Gu, X.M.

AU - Zhou, G.T.

AU - Wang, W.

AU - Liu, J.Y.

AU - Wang, Y.

AU - Mao, Z.Q.

AU - Wu, X.S.

AU - Dong, S.

N1 - cited By 0

PY - 2018

Y1 - 2018

N2 - We present a detailed investigation of the specific heat of Ca 3 (Ru 1-x M x ) 2 O 7 (M = Ti, Fe, Mn) single crystals. Depending on the dopant and doping level, three distinct regions are present: a quasitwo-dimensional metallic state with antiferromagnetic (AFM) order formed by ferromagnetic bilayers (AFM-b), a Mott insulating state with G-type AFM order (G-AFM), and a localized state with a mixed AFM-b and G-AFM phase. Our specific heat data provide deep insights into the Mott transitions induced by Ti and Mn doping. We observed not only an anomalous large mass enhancement, but also an additional term in the specific heat, i.e., C \ T 2 , in the localized region. The C \ T 2 term is most likely due to long-wavelength excitations with both FM and AFM components. A decrease in the Debye temperature is observed in the G-type AFM region, indicating lattice softening associated with the Mott transition. \ 2018, Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature.

AB - We present a detailed investigation of the specific heat of Ca 3 (Ru 1-x M x ) 2 O 7 (M = Ti, Fe, Mn) single crystals. Depending on the dopant and doping level, three distinct regions are present: a quasitwo-dimensional metallic state with antiferromagnetic (AFM) order formed by ferromagnetic bilayers (AFM-b), a Mott insulating state with G-type AFM order (G-AFM), and a localized state with a mixed AFM-b and G-AFM phase. Our specific heat data provide deep insights into the Mott transitions induced by Ti and Mn doping. We observed not only an anomalous large mass enhancement, but also an additional term in the specific heat, i.e., C \ T 2 , in the localized region. The C \ T 2 term is most likely due to long-wavelength excitations with both FM and AFM components. A decrease in the Debye temperature is observed in the G-type AFM region, indicating lattice softening associated with the Mott transition. \ 2018, Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature.

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JO - Frontiers of Physics

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