TY - JOUR
T1 - Spin-charge coupling in lightly doped Nd 2-xCe x-CuO 4
AU - Li, Shiliang
AU - Wilson, Stephen D.
AU - Mandrus, David
AU - Zhao, Bairu
AU - Onose, Y.
AU - Tokura, Y.
AU - Dai, Pengcheng
PY - 2005/2
Y1 - 2005/2
N2 - We use neutron scattering to study the influence of a magnetic field on spin structures of Nd 2CuO 4. On cooling from room temperature, Nd 2CuO 4 goes through a series of antiferromagnetic (AF) phase transitions with different noncollinear spin structures. While a c-axis aligned magnetic field does not alter the basic zero-field noncollinear spin structures, a field parallel to the CuO 2 plane can transform the noncollinear structure to a collinear one ("spin-flop" transition), induce magnetic disorder along the c axis, and cause hysteresis in the AF phase transitions. By comparing these results directly to the magnetoresistance (MR) measurements of Nd 1.975Ce 0.025CuO 4, which has essentially the same AF structures as Nd 2CuO 4, we find that a magnetic-field-induced spin-flop transition, AF phase hysteresis, and spin c-axis disorder all affect the transport properties of the material. Our results thus provide direct evidence for the existence of a strong spin-charge coupling in electron-doped copper oxides.
AB - We use neutron scattering to study the influence of a magnetic field on spin structures of Nd 2CuO 4. On cooling from room temperature, Nd 2CuO 4 goes through a series of antiferromagnetic (AF) phase transitions with different noncollinear spin structures. While a c-axis aligned magnetic field does not alter the basic zero-field noncollinear spin structures, a field parallel to the CuO 2 plane can transform the noncollinear structure to a collinear one ("spin-flop" transition), induce magnetic disorder along the c axis, and cause hysteresis in the AF phase transitions. By comparing these results directly to the magnetoresistance (MR) measurements of Nd 1.975Ce 0.025CuO 4, which has essentially the same AF structures as Nd 2CuO 4, we find that a magnetic-field-induced spin-flop transition, AF phase hysteresis, and spin c-axis disorder all affect the transport properties of the material. Our results thus provide direct evidence for the existence of a strong spin-charge coupling in electron-doped copper oxides.
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U2 - 10.1103/PhysRevB.71.054505
DO - 10.1103/PhysRevB.71.054505
M3 - Article
AN - SCOPUS:15744383654
VL - 71
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 5
M1 - 054505
ER -