@article{oai:niigata-u.repo.nii.ac.jp:00002494,
 author = {Goh, S.K. and Mizukami, Y. and Shishido, H. and Watanabe, D. and Yasumoto, S. and Shimozawa, M. and Yamashita, M. and Terashima, T. and Yanase, Y. and Shibauchi, T. and Buzdin, A.I. and Matsuda, Y.},
 issue = {157006},
 journal = {Physical Review Letters, Physical Review Letters},
 month = {Oct},
 note = {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)(θ) changes smoothly as a function of the field angle θ. However, close to the superconducting transition temperature, H(c2)(θ) exhibits a cusp near the parallel field (θ=0°). 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)(θ) as well, our results suggest that some exotic superconducting states, including a helical superconducting state, might be realized at high magnetic fields.},
 pages = {1--5},
 title = {Anomalous upper critical field in CeCoIn5/YbCoIn5 superlattices with a Rashba-type heavy Fermion interface.},
 volume = {109},
 year = {2012}
}