Magnetic-field-enhanced incommensurate magnetic order in the underdoped high-temperature superconductor YBa2Cu3O6.45

• Published in: Physical review letters Vol. 103; no. 1; p. 017001
• Main Authors: Haug, D, Hinkov, V, Suchaneck, A, Inosov, D S, Christensen, N B, Niedermayer, Ch, Bourges, P, Sidis, Y, Park, J T, Ivanov, A, Lin, C T, Mesot, J, Keimer, B
• Format: Journal Article
• Language: English
• Published: United States 03-07-2009
• ISSN: 0031-9007
• DOI: 10.1103/PhysRevLett.103.017001

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.