Coexistence of superconductivity and antiferromagnetism inCeRh1−xCox

V. S. Zapf

¹

,

E. J. Freeman

²

,

E. D. Bauer

³

et al.

Abstract

Single-crystal specimens of CeRh 1Ϫx Co x In 5 have been investigated by means of specific heat, electrical resistivity, and magnetic susceptibility measurements as a function of temperature. The measurements reveal the occurrence of superconductivity in compounds with 0.4рxр1.0 with superconducting transition temperatures between ϳ1 and 2 K and antiferromagnetic order in compounds with 0.2рxр0.6 with Néel temperatures between ϳ3 and 4 K. Superconductivity and antiferromagnetism appear to coexist for concentrations in the range 0.4рxр0.6. Specific-heat measurements indicate that the total entropy under the superconducting and antiferromagnetic transitions is comparable for the samples with 0рxр0.8, which implies that the same electrons are participating in the two phenomena. Measurements of the ac magnetic susceptibility revealed superconducting transitions in single-crystal specimens of CeRhIn 5 at T c ϭ0.09 K, but the superconductivity was suppressed when the samples were powdered.

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo1−xNixIn5

“…[13][14][15][16][17][18] Furthermore, the existence of the AFM-QCP at ∼ H c2 is strongly suggested from the observations of the NFL behavior in the paramagnetic phase above H c2 , including the − ln T divergence in specific heat divided by temperature, the T -linear dependence in magnetization, and electrical resistivity. 10,19,20) In fact, the long-range AFM orders are generated by substituting the ions for the elements in CeCoIn 5 , such as Nd for Ce, 21,22) Rh for Co, [23][24][25][26] and Cd, Hg, and Zn for In. [27][28][29][30] In contrast to the doping effect by those ions, the substitution of Sn for In simply suppresses the SC phase without generating the AFM order.…”

Thermodynamic and transport properties of single-crystallineUMGa5(M=Fe,Moreno1, Bauer2, Sarrao3 et al. 2005Phys. Rev. BSelf Cite334210View full textAdd to dashboardCite

“…Further, pressure-dependent and doping-dependent studies have revealed extremely rich phase diagrams that include the microscopic coexistence of superconductivity and magnetism. [4][5][6][7] Quite recently, superconductivity has also been reported in isostructural PuCoGa 5 and PuRhGa 5 . 8,9 Although less is known about these plutonium-based materials, the underlying physics appears to be similar 10 to that of CeMIn 5 and, in particular, seems to rely on the existence of at least partially localized f electrons.…”

“…[4][5][6][7] Quite recently, superconductivity has also been reported in isostructural PuCoGa 5 and PuRhGa 5 . 8,9 Although less is known about these plutonium-based materials, the underlying physics appears to be similar 10 to that of CeMIn 5 and, in particular, seems to rely on the existence of at least partially localized f electrons. [11][12][13] A family of uranium-based analogues of CeMIn 5 and PuMGa 5 was reported some time ago.…”

“…8,9 Although less is known about these plutonium-based materials, the underlying physics appears to be similar 10 to that of CeMIn 5 and, in particular, seems to rely on the existence of at least partially localized f electrons. [11][12][13] A family of uranium-based analogues of CeMIn 5 and PuMGa 5 was reported some time ago. 14 UMGa 5 crystallizes in the same tetragonal HoGoGa 5 -type structure as the Ce and Pu variants for M = Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt.…”

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

“…By substituting Co onto the Rh site in CeRhIn 5 , we demonstrated the CeCoIn 5 is indeed near to an antiferromagnetic QCP [158,159]. We tracked both T N and T c in the electrical resistivity, specific heat and magnetic susceptibility over the entire doping range and established that the AFM state in CeRh 1−x Co x In 5 persists up to a critical concentration x c ≈ 0.75 where T N is suppressed to zero.…”