Field-induced soft-mode quantum phase transition in La${}_{1.855}$Sr${}_{0.145}$CuO${}_4$

Abstract

Inelastic neutron-scattering experiments on the high-temperature superconductor La${}_{1.855}$Sr${}_{0.145}$CuO${}_4$ reveal a magnetic excitation gap $\Delta$ that decreases continuously upon application of a magnetic field perpendicular to the CuO${}_2$ planes. The gap vanishes at the critical field required to induce long-range incommensurate antiferromagnetic order, providing compelling evidence for a field-induced soft-mode driven quantum phase transition.

References in corpus (1)

• Electronic liquid crystal state in the high-temperature superconductor YBCO(6.45)

Cited by in corpus (4)

• Magnetic-field-enhanced incommensurate magnetic order in the underdoped high-temperature superconductor YBa(2)Cu(3)O(6.45)
• Competition between spin density wave order and superconductivity in the underdoped cuprates
• Fluctuating spin density waves in metals
• Magnetic field-induced soft mode in spin-gapped high-Tc superconductors