Field-induced soft-mode quantum phase transition in La$_{1.855}$Sr$_{0.145}$CuO$_{4}$

A. Hiess; A. Schneidewind; Ch. Niedermayer; D. F. McMorrow; H. M. Roennow; J. Chang; J. Mesot; K. Lefmann; M. Boehm; M. Ido

arxiv: 0902.1191 · v1 · submitted 2009-02-06 · ❄️ cond-mat.supr-con · cond-mat.str-el

Field-induced soft-mode quantum phase transition in La_(1.855)Sr_(0.145)CuO₄

J. Chang , N. B. Christensen , Ch. Niedermayer , K. Lefmann , H. M. Roennow , D. F. McMorrow , A. Schneidewind , P. Link

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A. Hiess M. Boehm R. Mottl S. Pailhes N. Momono M. Oda M. Ido J. Mesot

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classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords fieldfield-inducedmagneticphasequantumsoft-modetransitionantiferromagnetic

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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.

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Field-induced soft-mode quantum phase transition in La_(1.855)Sr_(0.145)CuO₄

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