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- W1555026173 abstract "We report $^{63}text{C}text{u-NMR}/text{NQR}$ and $^{19}text{F}text{-NMR}$ studies on the multilayered high-${T}_{c}$ copper oxides ${text{Ba}}_{2}{text{Ca}}_{nensuremath{-}1}{text{Cu}}_{n}{text{O}}_{2n}{text{F}}_{2}$ with $n=2,3,4$, where $n$ is the number of ${text{CuO}}_{2}$ planes. It is revealed that bilayered ${text{Ba}}_{2}{text{CaCu}}_{2}{text{O}}_{4}{text{F}}_{2}$ is an underdoped superconductor with hole carriers, which are introduced into ${text{CuO}}_{2}$ planes by an unexpected deviation from the nominal content of apical fluorines. In a previous paper, we proposed a self-doping mechanism as the origin of carrier doping in $n=3$ and $n=4$; in the mechanism, electrons are transferred from the inner ${text{CuO}}_{2}$ plane (IP) to the outer one (OP). However, since it has been found that the bilayered compound is hole doped, we have re-examined the superconducting and magnetic properties in $n=3$ and $n=4$ by $^{63}text{C}text{u-NMR}/text{NQR}$ and $^{19}text{F}text{-NMR}$. The extensive NMR studies have confirmed that the apical-fluorine compounds are not self-doped but hole doped and that antiferromagnetism (AFM) and superconductivity (SC) coexist in a single ${text{CuO}}_{2}$ plane. In $n=4$, the AFM ordering occurs at ${T}_{N}=80text{ }text{K}$ well above ${T}_{c}=55text{ }text{K}$, where the respective AFM moments are ${M}_{text{AFM}}=0.11{ensuremath{mu}}_{B}$ and $0.18{ensuremath{mu}}_{B}$ at the OP and the IP. In $n=3$, on the other hand, the underdoped single IP exhibits a spontaneous moment ${M}_{text{AFM}}=0.12{ensuremath{mu}}_{B}$ at low temperatures and a peak in the nuclear-spin-lattice relaxation rate $1/{T}_{1}$ of $^{19}text{F}$ at ${T}_{N}=23text{ }text{K}$ much lower than ${T}_{c}=76text{ }text{K}$. We note that the increase in the number of IPs from one to two results in the strengthening of the interlayer coupling; ${T}_{N}$ increases as the interlayer coupling becomes stronger, although the doping levels for both compounds are comparable. Consequently, we conclude that the uniform mixing of AFM and SC is a general property inherent to a single ${text{CuO}}_{2}$ plane in an underdoped regime for hole doping. This conclusion incorporates the angle-resolved photoemission spectroscopy results on the $n=4$ compound [Chen et al., Phys. Rev. Lett. 97, 236401 (2006)]; it was found that the two Fermi sheets of the IP and OP are observed and that the SC gap opens at the IP and OP below ${T}_{c}=55text{ }text{K}$." @default.
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- W1555026173 date "2009-02-04" @default.
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- W1555026173 title "Uniform mixing of antiferromagnetism and high-Tcsuperconductivity in multilayer copper oxidesBa2Can−1CunO2nF2(n=2,3,4)with apical fluorines:C63u-NMR/NQRandF19-NMRstudies" @default.
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- W1555026173 doi "https://doi.org/10.1103/physrevb.79.064505" @default.
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