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

doi:10.1007/s11467-018-0813-z

Front. Phys.

2018, Vol. 13

Issue (4) : 137108 https://doi.org/10.1007/s11467-018-0813-z

RESEARCH ARTICLE

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

Jin Peng¹(

), X. M. Gu², G. T. Zhou², W. Wang², J. Y. Liu³, Yu Wang³, Z. Q. Mao³, X. S. Wu², Shuai Dong¹

¹. School of Physics, Southeast University, Nanjing 211189, China
². Collaborative Innovation Center of Advanced Microstrucutres, Lab of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
³. Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA

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Abstract

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.

Keywords specific heat ruthenates Mott insulator phase separation

Corresponding Author(s): Jin Peng

Issue Date: 06 August 2018

Cite this article:

Jin Peng,X. M. Gu,G. T. Zhou, et al. Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates[J]. Front. Phys. , 2018, 13(4): 137108.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-018-0813-z
https://academic.hep.com.cn/fop/EN/Y2018/V13/I4/137108

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