Nature of the magnetic stripes in fully oxygenated 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:math>

Ţuţueanu, A. E.; Jacobsen, Henrik; Ray, Pia Jensen; Holm-Dahlin, Sonja; Lǎcǎtuşu, Monica Elisabeta; Tejsner, Tim Birger; Grivel, Jean‐Claude; Schmidt, W.; Toft-Petersen, Rasmus; Steffens, P.; Boehm, Martin; Wells, B. O.; Udby, Linda; Lefmann, Kim; Rømer, Astrid T.

doi:10.1103/physrevb.103.045138

Cited by 5 publications

References 84 publications

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Tilted stripes origin in La1.88Sr0.12CuO4 revealed by anisotropic next-nearest neighbor hopping

He,

Wen,

Jiang

et al. 2024

Commun Phys

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Spin- and charge- stripe order has been extensively studied in the superconducting cuprates, among which underdoped La2−xSrxCuO4 (LSCO) is an archetype with static spin stripes at low temperatures. An intriguing, but not completely understood, phenomenon in LSCO is that the stripes are tilted away from the high-symmetry Cu-Cu directions. Using high-resolution neutron scattering on LSCO with x = 0.12, we find two coexisting phases at low temperatures, one with static spin stripes and the other with fluctuating ones, both sharing the same tilt angle. Our numerical calculations using the doped Hubbard model elucidate the tilting’s origin, attributing it to anisotropic next-nearest neighbor hopping $${t}^{{\prime} }$$ t ′ , consistent with the material’s slight orthorhombicity. Our results underscore the model’s success in describing specific details of the ground state of this real material and highlight the role of $${t}^{{\prime} }$$ t ′ in the Hamiltonian, revealing the delicate interplay between stripes and superconductivity across theoretical and experimental contexts.

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Tilted stripes origin in La1.88Sr0.12CuO4 revealed by anisotropic next-nearest neighbor hopping

He,

Wen,

Jiang

et al. 2024

Commun Phys

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Designing the stripe-ordered cuprate phase diagram through uniaxial-stress

Guguchia,

Das,

Simutis

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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The ability to efficiently control charge and spin in the cuprate high-temperature superconductors is crucial for fundamental research and underpins technological development. Here, we explore the tunability of magnetism, superconductivity, and crystal structure in the stripe phase of the cuprate La 2 − x Ba x CuO 4 , with x = 0.115 and 0.135, by employing temperature-dependent (down to 400 mK) muon-spin rotation and AC susceptibility, as well as X-ray scattering experiments under compressive uniaxial stress in the CuO 2 plane. A sixfold increase of the three-dimensional (3D) superconducting critical temperature T c and a full recovery of the 3D phase coherence is observed in both samples with the application of extremely low uniaxial stress of ∼ 0.1 GPa. This finding demonstrates the removal of the well-known 1/8-anomaly of cuprates by uniaxial stress. On the other hand, the spin-stripe order temperature as well as the magnetic fraction at 400 mK show only a modest decrease under stress. Moreover, the onset temperatures of 3D superconductivity and spin-stripe order are very similar in the large stress regime. However, strain produces an inhomogeneous suppression of the spin-stripe order at elevated temperatures. Namely, a substantial decrease of the magnetic volume fraction and a full suppression of the low-temperature tetragonal structure is found under stress, which is a necessary condition for the development of the 3D superconducting phase with optimal T c . Our results evidence a remarkable cooperation between the long-range static spin-stripe order and the underlying crystalline order with the three-dimensional fully coherent superconductivity. Overall, these results suggest that the stripe- and the SC order may have a common physical mechanism.

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Plane wave implementation of the magnetic force theorem for magnetic exchange constants: application to bulk Fe, Co and Ni

Durhuus¹,

Skovhus²,

Olsen³

2023

J. Phys.: Condens. Matter

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We present a plane wave implementation of the magnetic force theorem, which provides a ﬁrst principles framework for extracting exchange constants parameterizing a classical Heisenberg model description of magnetic materials. It is shown that the full microscopic exchange tensor may be expressed in terms of the static Kohn-Sham susceptibility tensor and the exchange-correlation magnetic ﬁeld. This formulation allows one to deﬁne arbitrary magnetic sites localized to predeﬁned spatial regions, hence rendering the problem of ﬁnding Heisenberg parameters independent of any orbital decomposition of the problem. The susceptibility is calculated in a plane wave basis, which allows for systematic convergence with respect to unoccupied bands and spatial representation. We then apply the method to the well-studied problem of calculating adiabatic spin wave spectra for bulk Fe, Co and Ni, ﬁnding good agreement with previous calculations. In particular, we utilize the freedom of deﬁning magnetic sites to show that the calculated Heisenberg parameters are robust towards changes in the deﬁnition of magnetic sites. This demonstrates that the magnetic sites can be regarded as well deﬁned and thus asserts the relevance of the Heisenberg model description despite the itinerant nature of the magnetic state.

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Nature of the magnetic stripes in fully oxygenated La2CuO4+y

Cited by 5 publications

References 84 publications

Tilted stripes origin in La1.88Sr0.12CuO4 revealed by anisotropic next-nearest neighbor hopping

Tilted stripes origin in La1.88Sr0.12CuO4 revealed by anisotropic next-nearest neighbor hopping

Designing the stripe-ordered cuprate phase diagram through uniaxial-stress

Plane wave implementation of the magnetic force theorem for magnetic exchange constants: application to bulk Fe, Co and Ni

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