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.
U2 - 10.1007/s11467-018-0813-z
DO - 10.1007/s11467-018-0813-z
M3 - Article
SN - 2095-0462
VL - 13
JO - Frontiers of Physics
JF - Frontiers of Physics
IS - 4
ER -