Strong pinning of vortices by antiferromagnetic domain boundaries in CeCo(In1-xCdx)5

arXiv:1609.01164v1 [cond-mat.supr-con] 5 Sep 2016 Strong pinning of vortices by antiferromagnetic domain boundaries in CeCo(In 1−x Cd x ) 5 Dong-Jin Jang 1 † , Luis Pedrero 1 , L. D. Pham 2 , Z. Fisk 3 and Manuel Brando 1 † Max Planck Institut f¨ ur Chemische Physik fester Stoffe, 01187 Dresden, Germany University of California, Davis, California 95616, USA University of California, Irvine, California 92697-4573, USA Abstract. We have studied the isothermal magnetization M (H) of CeCo(In 1−x Cd x ) 5 with x = 0.0075 and 0.01 down to 50 mK. Pronounced field-history dependent phe- nomena occur in the coexistence regime of the superconducting and antiferromagnetic phases. At low-fields, a phenomenological model of magnetic-flux entry well explains M (H) implying the dominance of bulk pinning effect. However, unless crystallographic quenched disorder is hysteretic, the asymmetric peak effect (ASPE) which appears at higher fields cannot be explained by the pinning of vortices due to material defects. Also the temperature dependence of the ASPE deviates from the conventional scenario for the peak effect. Comparison of our thermodynamic phase diagrams with those from previous neutron scattering and magnetoresistance experiments indicates that the pin- ning of vortices takes place at the field-history dependent antiferromagnetic domain boundaries. † Corresponding authors Email: dongjin.jang@cpfs.mpg.de, manuel.brando@cpfs.mpg.de