Magnetic-field-induced soft-mode quantum phase transition in the high-temperature superconductor La1.855Sr0.145CuO4: an inelastic neutron-scattering study.
作者信息
Chang J, Christensen N B, Niedermayer Ch, Lefmann K, Rønnow H M, McMorrow D F, Schneidewind A, Link P, Hiess A, Boehm M, Mottl R, Pailhés S, Momono N, Oda M, Ido M, Mesot J
机构信息
Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH-5232 Villigen PSI, Switzerland.
出版信息
Phys Rev Lett. 2009 May 1;102(17):177006. doi: 10.1103/PhysRevLett.102.177006. Epub 2009 Apr 30.
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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