Anomalous Field Dependence of Magnetic Penetration Depth in the Vortex State of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>CeRu</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> Probed by Muon Spin Rotation

A. Yamashita; K. Ishii; T. Yokoo; J. Akimitsu; M. Hedo; Y. Inada; Y. Ōnuki; E. Yamamoto; Y. Haga; R. Kadono

doi:10.1103/PhysRevLett.79.3771

Anomalous Field Dependence of Magnetic Penetration Depth in the Vortex State of ${CeRu}_{2}$ Probed by Muon Spin Rotation

A. Yamashita, K. Ishii, T. Yokoo, J. Akimitsu, M. Hedo, Y. Inada, Y. Ōnuki, E. Yamamoto, Y. Haga, and R. Kadono

Phys. Rev. Lett. 79, 3771 – Published 10 November 1997

Abstract

Magnetic penetration depths in the mixed state of a heavy-fermion superconductor ${CeRu}_{2}$ have been measured by muon spin rotation. An anomalous increase of the observed penetration depth associated with the hysteresis peak of magnetization strongly suggests a new vortex phase, possibly a generalized Fulde-Ferrel-Larkin-Ovchinnikov state, near the upper critical field.