Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.177006
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Funding
- Swiss NSF [200020-105151, PBEZP2-122855]
- Ministry of Education and Science of Japan
- EPSRC [EP/F032293/1] Funding Source: UKRI
- Swiss National Science Foundation (SNF) [PBEZP2-122855] Funding Source: Swiss National Science Foundation (SNF)
- Engineering and Physical Sciences Research Council [EP/F032293/1] Funding Source: researchfish
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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.
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