GOH, S. K.; MIZUKAMI, Y.; SHISHIDO, H.; WATANABE, D.; YASUMOTO, S.; SHIMOZAWA, M.; YAMASHITA, Minoru; TERASHIMA, T.; YANASE, Y.; SHIBAUCHI, T.; BUZDIN, Alexandre I.; MATSUDA, Y.

doi:10.1103/PhysRevLett.109.157006

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GOH, S. K.
Department of Physics [Kyoto]
Cavendish Laboratory

MIZUKAMI, Y.
Department of Physics [Kyoto]

SHISHIDO, H.
Department of Physics [Kyoto]

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Physical Review Letters. 2012, vol. 109, n° 15, p. 157006

American Physical Society

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We report a highly unusual angular variation of the upper critical field (H_c2) in epitaxial superlattices CeCoIn_5(n)/YbCoIn_5(5), formed by alternating layers of n and a 5 unit-cell thick heavy-fermion superconductor CeCoIn_5 with a strong Pauli effect and normal metal YbCoIn_5, respectively. For the n=3 superlattice, H_{c2}(\theta) changes smoothly as a function of the field angle \theta. However, close to the superconducting transition temperature, H_{c2}(\theta) exhibits a cusp near the parallel field (\theta=0 deg). This cusp behavior disappears for n=4 and 5 superlattices. This sudden disappearance suggests the relative dominance of the orbital depairing effect in the n=3 superlattice, which may be due to the suppression of the Pauli effect in a system with local inversion symmetry breaking. Taking into account the temperature dependence of H_{c2}(\theta) as well, our results suggest that some exotic superconducting states, including a helical superconducting state, might be realized at high magnetic fields.< Leer menos

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Mixed states - critical fields and surface sheaths

Molecular - atomic - ion and chemical beam epitaxy

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Anomalous Upper Critical Field in CeCoIn_5/YbCoIn_5 Superlattices with a Rashba-type Heavy Fermion Interface

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