Magnetic field tuned superconducting and normal phase magnetism in CeCo$_{0.5}$Rh$_{0.5}$In$_{5}$

A. Howell; M. Songvilay; J. A. Rodriguez-Rivera; Ch. Niedermayer; Z. Husges; P. Manuel; S. Saha; C. Eckberg; J. Paglione; C. Stock

doi:10.1103/PhysRevB.110.214431

paper

Magnetic field tuned superconducting and normal phase magnetism in CeCo $_{0.5}$ Rh $_{0.5}$ In $_{5}$

arXiv:2411.18540 · doi:10.1103/PhysRevB.110.214431

Abstract

By tuning superconductivity with an applied magnetic field, we use neutrons to compare the magnetic ordered phases in superconducting and normal states of CeCo $_{0.5}$ Rh $_{0.5}$ In $_{5}$ . At zero field, CeCo $_{0.5}$ Rh $_{0.5}$ In $_{5}$ displays both superconductivity ( $T_{c}$ =1.3 K) and spatially long-ranged commensurate $↑↓↑↓$ antiferromagnetism ( $T_{N}$ =2.5 K, $Q_{0} = (\frac{1}{2}, \frac{1}{2}, \frac{1}{2})$ ). Neutron spectroscopy fails to measure propagating magnetic excitations with only temporally overdamped fluctuations observable. On applying a magnetic field we find anisotropic behavior in the static magnetism. When the field is along the crystallographic $c$ -axis, no change in the static magnetic response is observable. However when the field is oriented within the $a - b$ plane, an increase in $T_{N}$ and change in the critical response are measured. At low temperatures in the superconducting phase, the elastic magnetic intensity increases linearly ( $\propto ∣ H ∣$ ) with small $a - b$ oriented fields. However, this trend is interrupted at intermediate fields where commensurate block $↑↑↓↓$ magnetism with propagation vector $Q = (\frac{1}{2}, \frac{1}{2}, \frac{1}{4})$ forms. For large applied fields in the [1 $1$ 0] direction which completely suppresses superconductivity, weakly incommensurate magnetic order along $L$ is observed to replace the commensurate response present in the superconducting and vortex phases. We suggest field-induced incommensurate static magnetism, present in the normal state of superconducting and antiferromagnetic CeCo $_{0.5}$ Rh $_{0.5}$ In $_{5}$ for $a - b$ plane oriented magnetic fields. We speculate that these field dependent properties are tied to the field induced anisotropy associated with the local Ce $^{3 +}$ crystal field environment of the tetragonal `115' structure.

arXiv comment(13 pages, 7 figures, to be published in Phys. Rev. B)

Magnetic field tuned superconducting and normal phase magnetism in CeCo0.5​Rh0.5​In5​

Abstract

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Magnetic field tuned superconducting and normal phase magnetism in CeCo $_{0.5}$ Rh $_{0.5}$ In $_{5}$