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      Diamagnetic critical singularity in unconventional ferromagnetic superconductors

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          Abstract

          The scaling properties of the free energy, the diamagnetic moment, and the diamagnetic susceptibility above the phase transition from the ferromagnetic phase to the phase of coexistence of ferromagnetic order and superconductivity in unconventional ferromagnetic superconductors with spin-triplet (p-wave) electron paring are considered. The crossover from weak to strong magnetic induction is described for both quasi-2D (thin films) and 3D (bulk) superconductors. The singularities of diamagnetic moment and diamagnetic susceptibility are dumped for large variations of the pressure and, hence, such singularities could hardly be observed in experiments. The results are obtained within Gaussian approximation on the basis of general theory of ferromagnetic superconductors with p-wave electron pairing.

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          Coexistence of superconductivity and ferromagnetism in URhGe.

          D Aoki, A HUXLEY, E Ressouche … (2001)
          The discovery of superconductivity at high pressure (albeit over a restricted range) in the ferromagnetic material UGe2 raised the possibility that bulk superconductivity might be found in other ferromagnets. The exact symmetry of the paired state and the dominant mechanism responsible for the pairing, however, remain unidentified. Meanwhile, the conjecture that superconductivity could occur more generally in ferromagnets has been fuelled by the recent observation of a low-temperature transition that suggests an onset of superconductivity in high-quality crystals of the itinerant-ferromagnet ZrZn2 (ref. 2), although the thermodynamic signature of this transition could not be detected. Here we show that the ferromagnet URhGe is superconducting at ambient pressure. In this case, we find the thermodynamic signature of the transition-its form is consistent with a superconducting pairing of a spin-triplet type, although further testing with cleaner samples is needed to confirm this. The combination of superconductivity and ferromagnetism may thus be more common and consequently more important than hitherto realized.
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            UGe2: A ferromagnetic spin-triplet superconductor

            Andrew Huxley, Ilya Sheikin, Eric Ressouche … (2001)
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              Superconductivity on the border of weak itinerant ferromagnetism in UCoGe

              T. Gorlach, A Hamann, A. de Visser … (2007)
              We report the coexistence of ferromagnetic order and superconductivity in UCoGe at ambient pressure. Magnetization measurements show that UCoGe is a weak ferromagnet with a Curie temperature T_{C}= 3 K and a small ordered moment \(m_{0}\)= 0.03 \(\mu_B\). Superconductivity is observed with a resistive transition temperature T_{s} = 0.8 K for the best sample. Thermal-expansion and specific-heat measurements provide solid evidence for bulk magnetism and superconductivity. The proximity to a ferromagnetic instability, the defect sensitivity of T_{s}, and the absence of Pauli limiting, suggest triplet superconductivity mediated by critical ferromagnetic fluctuations.
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                Author and article information

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                Publication date Created: 06 December 2010
                Publication date Updated: 2012-01-18
                Article
                ArXiV ID: 1012.1205
                SO-VID: b7949550-d985-4254-a898-462ca440c57d
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
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                Journal reference Bulg. J. Phys. 39 (2012) 27-50
                Comments To be published in Bulg. J. Phys (2012)
                Categories cond-mat.supr-con quant-ph

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