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

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

doi:10.1007/s11467-018-0813-z

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

Journal Article · Thu Aug 02 00:00:00 EDT 2018 · Frontiers of Physics

DOI:https://doi.org/10.1007/s11467-018-0813-z· OSTI ID:1673742

Peng, Jin ^[1]; Gu, X. M. ^[2]; Zhou, G. T. ^[2]; Wang, W. ^[2]; Liu, J. Y. ^[3]; Wang, Yu ^[3]; Mao, Z. Q. ^[3]; Wu, X. S. ^[2]; Dong, Shuai ^[1]

Southeast Univ., Nanjing (China)
Nanjing Univ. (China)
Tulane Univ., New Orleans, LA (United States)

Here, we present a detailed investigation of the specific heat of Ca₃(Ru_1-xM_x)₂O₇ (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 ∝ T², in the localized region. The C ∝ T² 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.

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Research Organization:: Louisiana State Univ., Baton Rouge, LA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Fundamental Research Funds for the Central Universities China; National Key Research and Development Program of China

Grant/Contract Number:: SC0012432; 3207028403; 2017YFA0303202

OSTI ID:: 1673742

Journal Information:: Frontiers of Physics, Vol. 13, Issue 4; ISSN 2095-0462

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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