Magnetic-field-enhanced incommensurate magnetic order in the underdoped high-temperature superconductor YBa(2)Cu(3)O(6.45)

TL;DR

This study demonstrates that applying magnetic fields up to 15 T enhances static incommensurate magnetic order and alters magnetic excitations in underdoped YBa2Cu3O6.45, potentially causing Fermi surface reconstruction linked to high-temperature superconductivity.

Contribution

It provides new insights into how magnetic fields influence magnetic order and electronic structure in underdoped cuprates, revealing a possible mechanism for Fermi surface changes.

Findings

Magnetic field enhances static incommensurate magnetic order.

Field induces a spectral-weight shift in magnetic excitations.

Fermi surface reconstruction may be driven by magnetic superstructure.

Abstract

We present a neutron-scattering study of the static and dynamic spin correlations in the underdoped high-temperature superconductor YBa(2)Cu(3)O(6.45) 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.