Intrinsic magnetism in superconducting infinite-layer nickelates

Fowlie, Jennifer; Hadjimichael, Marios; Martins, Maria M.; Li, D.; Osada, Motoki; Wang, Bai Yang; Lee, Kyuho; Lee, Yonghun; Salman, Z.; Prokscha, T.; Triscone, Jean‐Marc; Hwang, Harold Y.; Suter, A.

doi:10.1038/s41567-022-01684-y

Cited by 46 publications

(13 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It may also suggest an intrinsic magnetism in superconducting Nd 1−x Eu x NiO 2 films. This suggestion is supported by the observation of magnetic excitations in other infinite-layer nickelate superconductors (29,30). Divalent Eu 4f 7 is in a high spin state (31), which may complicate the magnetic ground state of the Ni in superconducting Nd 1−x Eu x NiO 2 thin films.…”

Section: Electrical Characterization For Nenomentioning

confidence: 74%

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Wei

Zhang

et al. 2023

Sci. Adv.

View full text Add to dashboard Cite

We report on superconductivity in Nd 1− x Eu x NiO 2 using Eu as a 4f dopant of the parent NdNiO 2 infinite-layer compound. We use an all–in situ molecular beam epitaxy reduction process to achieve the superconducting phase, providing an alternate method to the ex situ CaH 2 reduction process to induce superconductivity in the infinite-layer nickelates. The Nd 1− x Eu x NiO 2 samples exhibit a step-terrace structure on their surfaces, have a T c onset of 21 K at x = 0.25, and have a large upper critical field that may be related to Eu 4f doping.

show abstract

Section: Electrical Characterization For Nenomentioning

confidence: 74%

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Wei

Zhang

et al. 2023

Sci. Adv.

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

“…[35] In addition, we also observe a resistivity drop in our undoped LaNiO 2 samples at ≈13 K (not shown), which is most likely to be the onset of the superconductivity observed in previous reports. [15,36] Systematic magnetotransport measurements were performed under external magnetic fields perpendicular (H || c) and parallel (H ⊥ c) to the NiO 2 planes under low fields up to 12 T and pulsed fields up to 56 T (Figure 2a,b; Figure S3, Supporting Information). Clearly, the nickelate films display highly anisotropic response to different magnetic field orientations, in sharp contrast to the isotropic behavior reported previously.…”

Section: Resultsmentioning

confidence: 99%

Evidence for Anisotropic Superconductivity Beyond Pauli Limit in Infinite‐Layer Lanthanum Nickelates

Sun

Liu

et al. 2023

Advanced Materials

View full text Add to dashboard Cite

After being expected to be a promising analog to cuprates for decades, superconductivity has recently been discovered in infinite‐layer nickelates, providing new opportunities to explore mechanisms of high‐temperature superconductivity. However, in sharp contrast to the single‐band and anisotropic superconductivity in cuprates, nickelates exhibit a multi‐band electronic structure and an unexpected isotropic superconductivity as reported recently, which challenges the cuprate‐like picture in nickelates. Here, it is shown that strong anisotropic magnetotransport behaviors exist in La‐based nickelate films with enhanced crystallinity and superconductivity ( = 18.8 K, = 16.5 K). The upper critical fields are anisotropic and violate the estimated Bardeen–Cooper–Schrieffer (BCS) Pauli limit () for in‐plane magnetic fields. Moreover, the anisotropic superconductivity is further manifested by the cusp‐like peak of the angle‐dependent Tc and the vortex motion anisotropy under external magnetic fields.

show abstract

“…These samples can be grown only in thin films and on small substrates of 10 × 10 mm 2 or 5 × 5 mm 2 size. Since the top layers of the sample are thin, one needs a low muon implantation energy to stop a maximum fraction of the muons in the nickelate layer [19]. As shown in Table 3, the FoM with 15-mm collimator is about 20% larger than that without collimator.…”

Section: µSr Measurementsmentioning

confidence: 99%

“…As shown in Table 3, the FoM with 15-mm collimator is about 20% larger than that without collimator. The use of the collimator with a corresponding increase of asymmetry and reduction of background turned out to be crucial for the analysis of the µSR data in zero magnetic field which were used to determine the details of the intrinsic magnetic state as a function of sample doping [19]. Note that the LEM rates are lower than those measured with the MCP in Tab.…”

Section: µSr Measurementsmentioning

confidence: 99%

Small sample measurements at the low energy muon facility of Paul Scherrer Institute

Ni¹,

Zhou²,

Martins³

et al. 2023

Preprint

View full text Add to dashboard Cite

The low energy muon spin rotation spectroscopy (LE-µSR) is primarily used to investigate thin films, surfaces, and interfaces of materials, which has matured at the Paul Scherrer Institute (PSI) and is routinely employed by users of the low energy muon (LEM) facility. However, because of the large beam spot and low implanted muons rate, LE-µSR measurements on small samples are difficult, requiring an optimal sample size of 25 × 25 mm 2 . Recently, we have boosted our ability to measure small samples, down to 5 × 5 mm 2 area, by beam collimation and tuning. This achievement is crucial for the measurements of many magnetic and superconducting materials. Furthermore, we have devised a method that allows us to measure five small area samples mounted together on the same sample plate. We expect this method to further improve the efficient use of beam time at LEM.

show abstract

Intrinsic magnetism in superconducting infinite-layer nickelates

Cited by 46 publications

References 40 publications

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Evidence for Anisotropic Superconductivity Beyond Pauli Limit in Infinite‐Layer Lanthanum Nickelates

Small sample measurements at the low energy muon facility of Paul Scherrer Institute

Contact Info

Product

Resources

About

Intrinsic magnetism in superconducting infinite-layer nickelates

Cited by 46 publications

References 40 publications

Superconducting Nd 1− x Eu x NiO 2 thin films using in situ synthesis

Superconducting Nd 1− x Eu x NiO 2 thin films using in situ synthesis

Evidence for Anisotropic Superconductivity Beyond Pauli Limit in Infinite‐Layer Lanthanum Nickelates

Small sample measurements at the low energy muon facility of Paul Scherrer Institute

Contact Info

Product

Resources

About

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis

Superconducting Nd _{1−
x} Eu _x NiO ₂ thin films using in situ synthesis