A Heavy Fermion Zn-Deficient CaBe<sub>2</sub>Ge<sub>2</sub>-Type Phase with Rare Ce-Based Ferromagnetism and Large Magnetoresistance

Lefèvre, Robin; Rohr, Fabian O. von

doi:10.1021/acs.chemmater.1c04328

Cited by 6 publications

(6 citation statements)

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“…Hence, it is of substantial interest to analyze the soft ferromagnetic behavior under the applied magnetic field, as it allows considering the strength of the FM correlations within the layers. In fact, a higher magnetic critical temperature of T M > 150 K is derived from the Arrott plots 39 , 40 shown in Fig. 3 d. The lack of hysteresis, together with the loss of magnetic anisotropy inferred from the M ( H ) curves above T N , indicate this precursor magnetic state to reflect the inherent FM fluctuations within the CrSBr layers, without long-range coherence.…”

Section: Resultsmentioning

confidence: 88%

Section: Magnetic Anisotropy and Ferromagnetic Correlations In Crsbrmentioning

confidence: 91%

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Dynamic magnetic crossover at the origin of the hidden-order in van der Waals antiferromagnet CrSBr

et al. 2022

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The van-der-Waals material CrSBr stands out as a promising two-dimensional magnet. Here, we report on its detailed magnetic and structural characteristics. We evidence that it undergoes a transition to an A-type antiferromagnetic state below TN ≈ 140 K with a pronounced two-dimensional character, preceded by ferromagnetic correlations within the monolayers. Furthermore, we unravel the low-temperature hidden-order within the long-range magnetically-ordered state. We find that it is associated to a slowing down of the magnetic fluctuations, accompanied by a continuous reorientation of the internal field. These take place upon cooling below Ts ≈ 100 K, until a spin freezing process occurs at T* ≈ 40 K. We argue this complex behavior to reflect a crossover driven by the in-plane uniaxial anisotropy, which is ultimately caused by its mixed-anion character. Our findings reinforce CrSBr as an important candidate for devices in the emergent field of two-dimensional magnetic materials.

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Section: Resultsmentioning

confidence: 88%

Section: Magnetic Anisotropy and Ferromagnetic Correlations In Crsbrmentioning

confidence: 91%

Dynamic magnetic crossover at the origin of the hidden-order in van der Waals antiferromagnet CrSBr

et al. 2022

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“…Hence, it is of substantial interest to analyze the soft ferromagnetic behavior under the applied magnetic field, as it allows considering the strength of the FM correlations within the layers. In fact, a higher magnetic critical temperature of T M > 150 K is derived from the Arrott plots 39,40 shown in Figure 3d. The lack of hysteresis, together with the loss of magnetic anisotropy inferred from the M(H) curves above T N , indicate this precursor magnetic state to reflect the inherent FM fluctuations within the CrSBr layers, without long-range coherence.…”

Section: Magnetic Anisotropy and Ferromagnetic Correlations In Crsbrmentioning

confidence: 94%

Dynamic Magnetic Crossover at the Origin of the Hidden-Order in van der Waals Antiferromagnet CrSBr

López-Paz,

Guguchia,

Pomjakushin

et al. 2022

Preprint

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The van der Waals material CrSBr stands out as a promising two-dimensional magnet. Especially, its high magnetic ordering temperature and versatile magneto-transport properties make CrSBr an important candidate for new devices in the emergent field of two-dimensional magnetic materials. To date, the magnetic and structural properties of CrSBr have not been fully elucidated. Here, we report on the detailed temperature-dependent magnetic and structural properties of this material, by comprehensively combining neutron scattering, muon spin relaxation spectroscopy, synchrotron X-ray diffraction, and magnetization measurements. We evidence that this material undergoes a transition to an A-type antiferromagnetic state below T N ≈ 140 K, with a pronounced two-dimensional character as deduced from the determined critical exponent of β ≈ 0.18. In our analysis of the field-induced metamagnetic transition, we find that the ferromagnetic correlations within the monolayers persist clearly above the Néel temperature in this material. Furthermore, we unravel the low-temperature (i.e. T < T N ) magnetic hidden order within the long-range magnetically ordered state. We find that it is associated to a slowing down of the magnetic fluctuations, accompanied by a continuous reorientation of the internal magnetic field. These take place upon cooling below T s ≈ 100 K, until a spin freezing process occurs at T * ≈ 40 K. We argue this complex dynamic behavior to reflect a magnetic crossover driven by the in-plane uniaxial anisotropy, which is ultimately caused by the mixed-anion character of the material. Our findings indicate that the magnetic and structural properties of CrSBr widen its potential application as a component for spin-based electronic devices.

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“…A larger Δ C / γT c may indicate stronger coupling, multiple superconducting gaps, or other unconventional pairing mechanisms. In the case of a large γ, it is worthwhile to analyze whether the material is a heavy fermion compound by determining the Kadowaki–Woods ratio and the Wilson ratio. − This may indicate strong electron–electron correlations.…”

Section: How To Provetopological Superconductivitymentioning

confidence: 99%

Chemical Principles of Intrinsic Topological Superconductors

von Rohr

2023

Chem. Mater.

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The concept of topological superconductivity has attracted immense interest in the physics community recently for several reasons: First, topological superconductors represent new phases of matter, which are topologically distinct from any other known phase of matter. Second, their discovery would enable the realization of the Majorana zero modes. Third, intrinsic topological superconductors promise to become important ingredients for next-generation quantum technologies. There are a handful of candidates to date considered as potential intrinsic topological superconductors. All of these display signs of unconventional, potentially topological superconductivity. However, the results from different experimental methods are inconclusive. One of the major challenges in the field of topological superconductivity has been the scarcity of potential materials, in contrast to the many exciting theoretical predictions of properties that could be unraveled by such a discovery. Currently, it should be fair to say that a material that convincingly displays intrinsic topological superconductivity and Majorana zero modes has so far not been discovered. This perspective aims to summarize the results of the most actively discussed potential topological superconductors for chemists. But, I will also compile the essential physical and chemical design principles of these materials from a chemists' perspective in order to motivate synthetic chemists to join the quest for the discovery of the first intrinsic topological superconductor.

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A Heavy Fermion Zn-Deficient CaBe₂Ge₂-Type Phase with Rare Ce-Based Ferromagnetism and Large Magnetoresistance

Cited by 6 publications

References 73 publications

Dynamic magnetic crossover at the origin of the hidden-order in van der Waals antiferromagnet CrSBr

Dynamic magnetic crossover at the origin of the hidden-order in van der Waals antiferromagnet CrSBr

Dynamic Magnetic Crossover at the Origin of the Hidden-Order in van der Waals Antiferromagnet CrSBr

Chemical Principles of Intrinsic Topological Superconductors

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A Heavy Fermion Zn-Deficient CaBe2Ge2-Type Phase with Rare Ce-Based Ferromagnetism and Large Magnetoresistance

Cited by 6 publications

References 73 publications

Dynamic magnetic crossover at the origin of the hidden-order in van der Waals antiferromagnet CrSBr

Dynamic magnetic crossover at the origin of the hidden-order in van der Waals antiferromagnet CrSBr

Dynamic Magnetic Crossover at the Origin of the Hidden-Order in van der Waals Antiferromagnet CrSBr

Chemical Principles of Intrinsic Topological Superconductors

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A Heavy Fermion Zn-Deficient CaBe₂Ge₂-Type Phase with Rare Ce-Based Ferromagnetism and Large Magnetoresistance