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Magnetic-Field-Induced Soft-Mode Quantum Phase Transition in the High-Temperature Superconductor La1.855Sr0.145CuO4: An Inelastic Neutron-Scattering Study

Chang, J; Christensen, NB; Niedermayer, C; Lefmann, K; Ronnow, HM; McMorrow, DF; Schneidewind, A; ... Mesot, J; + view all (2009) Magnetic-Field-Induced Soft-Mode Quantum Phase Transition in the High-Temperature Superconductor La1.855Sr0.145CuO4: An Inelastic Neutron-Scattering Study. PHYS REV LETT , 102 (17) , Article 177006. 10.1103/PhysRevLett.102.177006. Green open access

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Abstract

Inelastic neutron-scattering experiments on the high-temperature superconductor La1.855Sr0.145CuO4 reveal a magnetic excitation gap Delta that decreases continuously upon application of a magnetic field perpendicular to the CuO2 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.

Type: Article
Title: Magnetic-Field-Induced Soft-Mode Quantum Phase Transition in the High-Temperature Superconductor La1.855Sr0.145CuO4: An Inelastic Neutron-Scattering Study
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.102.177006
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.102.177006
Language: English
Additional information: © 2009 The American Physical Society
Keywords: SPIN, DYNAMICS, STATE, GAP, ORDER
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/140987
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