Magnetic-field-enhanced incommensurate magnetic order in the underdoped high-temperature superconductor YBa2Cu3O6.45.
We present a neutron-scattering study of the static and dynamic spin correlations in the underdoped high-temperature superconductor YBa2Cu3O6.45 in magnetic fields up to 15 T. The field strongly enhances static incommensurate magnetic order at low temperatures and induces a spectral-weight shift in the magnetic-excitation spectrum. A reconstruction of the Fermi surface driven by the field-enhanced magnetic superstructure may thus be responsible for the unusual Fermi surface topology revealed by recent quantum-oscillation experiments.
Haug
D
D
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Hinkov
V
V
Suchaneck
A
A
Inosov
D S
DS
Christensen
N B
NB
Niedermayer
Ch
Ch
Bourges
P
P
Sidis
Y
Y
Park
J T
JT
Ivanov
A
A
Lin
C T
CT
Mesot
J
J
Keimer
B
B