Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe2

Duan, Chunruo; Baumbach, Ryan; Podlesnyak, A.; Deng, Yuhang; Moir, Camilla M.; Breindel, Alexander; Maple, M. B.; Nica, Emilian M.; Si, Qimiao; Dai, Pengcheng

doi:10.1038/s41586-021-04151-5

Cited by 56 publications

(36 citation statements)

References 51 publications

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“…However, a definite identification of the superconducting order parameter symmetry and of the pairing mechanism in UTe 2 are still lacking. Microscopic neutron measurements have revealed incommensurate magnetic fluctuations [10][11][12], and a resonance at finite Q below the superconducting transition temperature T c [13,14], but not the expected ferromagnetic fluctuations. It is known that odd parity spin-triplet superconductivity can exist without ferromagnetic fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Field-induced tuning of the pairing state in a superconductor

Rosuel¹,

Marcenat²,

Knebel³

et al. 2022

Preprint

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The recently discovered superconductor UTe2 with a Tc between 1.5 K and 2 K, has attracted much attention due to indications of spin-triplet and topological superconductivity. Its properties under magnetic field are also remarkable, with field-reinforced and field-induced superconducting phases. Here, we report the first complete thermodynamic determination of the phase diagram for fields applied along the three crystallographic directions. Measurements were performed up to 36 T along the hard b axis in order to follow the superconducting transition up to the metamagnetic transition at Hm = 34.75 T. They demonstrate the existence of a phase transition line within the superconducting phase, and drastic differences occurring between these two phases. Detailed analysis supports a different spin state between the two phases, possibly a spin-triplet to spin-singlet transition.

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Section: Introductionmentioning

confidence: 99%

Field-induced tuning of the pairing state in a superconductor

Rosuel¹,

Marcenat²,

Knebel³

et al. 2022

Preprint

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“…Contrary to early expectations 2 , inelastic-neutronscattering experiments showed the presence of lowdimensional antiferromagnetic fluctuations, but no indication for ferromagnetic fluctuations so far [27][28][29] . These antiferromagnetic fluctuations, peaked at the incommensurate wavevector k 1 = (0, 0.57, 0), saturate below the characteristic temperature T * 1 = 15 K [28] and become gapped in the superconducting phase [30,31]. They may, therefore, play a role for the superconducting pairing mechanism.…”

Section: Introductionmentioning

confidence: 97%

Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe$_2$

Thebault,

Knafo,

Vališka

et al. 2022

Preprint

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Multiple unconventional superconducting phases are suspected to be driven by magnetic fluctuations in the heavy-fermion paramagnet UTe2, and a challenge is to identify the signatures of the electronic correlations, including the magnetic fluctuations, in the bulk physical quantities. Here, we investigate thoroughly the anisotropy of the electrical resistivity of UTe2 under intense magnetic fields up to 70 T, for different electrical-current and magnetic-field configurations. Two characteristic temperatures and an anisotropic low-temperature Fermi-liquid-like coefficient A, controlled by the electronic correlations, are extracted. Their critical behavior near the metamagnetic transition induced at µ0Hm 35 T for H b is characterized. Anisotropic scattering processes are evidenced and magnetic fluctuations are proposed to contribute, via a Kondo hybridization, to the electrical resistivity. Our work appeals for a microscopic modeling of the anisotropic contributions to the electrical resistivity as a milestone for understanding magnetically-mediated superconductivity in UTe2.

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“…Very recently, the uranium-based heavy fermion system containing f-electrons is considered to be an ideal platform for spin triplet superconductivity, whose pairing is mediated by ferromagnetic spin fluctuations. [13][14][15][16] In 2019, Sheng Ran et al discovered superconductivity in UTe 2 with anisotropic upper critical field H C2 that excessed the Pauli limit, temperature-independent nuclear magnetic resonance (NMR) Knight shift, the power-law behavior of electron specific heat, and nuclear spin lattice relaxation rate. 1 These unique properties indicate that UTe 2 is a reasonable candidate for spin triplet topological superconductivity.…”

Section: Introductionmentioning

confidence: 99%

“…All these observations suggest that AF spin fluctuations may induce spin-triplet pairing or that electron pairing in UTe 2 has a spin-singlet component. 13 UTe 2 crystals have been successfully grown by the chemical vapor transport (CVT) method and self-flux method. [17][18][19] The crystal quality of UTe 2 can significantly affect the transport properties of UTe 2 .…”

Section: Introductionmentioning

confidence: 99%

Controllable growth of centimetre-sized UTe₂ single crystals by the chemical vapor transport method

Yao

Yue

et al. 2022

CrystEngComm

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Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe2

Cited by 56 publications

References 51 publications

Field-induced tuning of the pairing state in a superconductor

Field-induced tuning of the pairing state in a superconductor

Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe$_2$

Controllable growth of centimetre-sized UTe₂ single crystals by the chemical vapor transport method

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Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe2

Cited by 56 publications

References 51 publications

Field-induced tuning of the pairing state in a superconductor

Field-induced tuning of the pairing state in a superconductor

Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe$_2$

Controllable growth of centimetre-sized UTe2 single crystals by the chemical vapor transport method

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Product

Resources

About

Controllable growth of centimetre-sized UTe₂ single crystals by the chemical vapor transport method