TY - JOUR

T1 - Commensurate Spin Dynamics in the Superconducting State of an Electron-Doped Cuprate Superconductor

AU - Yamada, K.

AU - Kurahashi, K.

AU - Uefuji, T.

AU - Fujita, M.

AU - Park, S.

AU - Lee, S. H.

AU - Endoh, Y.

PY - 2003

Y1 - 2003

N2 - We report neutron scattering studies on two single crystal samples of the electron-doped ([Formula presented]-type) superconducting (SC) cuprate [Formula presented] ([Formula presented]) with [Formula presented] and 25 K. Unlike the hole-doped ([Formula presented]-type) SC cuprates, where incommensurate magnetic fluctuations commonly exist, the [Formula presented]-type cuprate shows commensurate magnetic fluctuations at the tetragonal ([Formula presented]) reciprocal points both in the SC and in the normal state. A spin gap opens up when the [Formula presented]-type cuprate becomes SC, as in the optimally doped [Formula presented]-type [Formula presented]. The gap energy, however, increases gradually up to about 4 meV as [Formula presented] decreases from [Formula presented] to 2 K, which contrasts with the spin pseudogap behavior with a [Formula presented]-independent gap energy in the SC state of [Formula presented]-type cuprates.

AB - We report neutron scattering studies on two single crystal samples of the electron-doped ([Formula presented]-type) superconducting (SC) cuprate [Formula presented] ([Formula presented]) with [Formula presented] and 25 K. Unlike the hole-doped ([Formula presented]-type) SC cuprates, where incommensurate magnetic fluctuations commonly exist, the [Formula presented]-type cuprate shows commensurate magnetic fluctuations at the tetragonal ([Formula presented]) reciprocal points both in the SC and in the normal state. A spin gap opens up when the [Formula presented]-type cuprate becomes SC, as in the optimally doped [Formula presented]-type [Formula presented]. The gap energy, however, increases gradually up to about 4 meV as [Formula presented] decreases from [Formula presented] to 2 K, which contrasts with the spin pseudogap behavior with a [Formula presented]-independent gap energy in the SC state of [Formula presented]-type cuprates.

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U2 - 10.1103/PhysRevLett.90.137004

DO - 10.1103/PhysRevLett.90.137004

M3 - Article

AN - SCOPUS:84875678142

SN - 0031-9007

VL - 90

SP - 4

JO - Physical Review Letters

JF - Physical Review Letters

IS - 13

ER -