Anisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction

Li, Haifeng; Yan, Jiaqiang; Kim, Jong Woo; McCallum, R. W.; Lograsso, Thomas A.; Vaknin, David

doi:10.1103/physrevb.84.220501

Cited by 9 publications

(3 citation statements)

References 24 publications

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“…(2). Similar in-plane anisotropic magnetic correlations were also observed in the iron-based superconductors [49][50][51][52][53] that are highly frustrated, too, where its microscopic origin, from the ellipticity of the electron pockets or the competing exchange interactions associated with the local-moment magnetism, is still being strongly argued [54][55][56][57]. It is undoubted that the observed in-plane magnetic anisotropy in SrTb 2 O 4 indicates an appearance of the competing spin exchanges and is certainly associated with a description of the purelylocalized magnetism of ionic Tb 3+ ions.…”

Section: Discussionsupporting

confidence: 70%

Incommensurate antiferromagnetic order in the manifoldly-frustrated SrTb2O4 with transition temperature up to 4.28 K

Zhang

Senyshyn

et al. 2014

Front. Phys.

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The Néel temperature of the new frustrated family of SrRE 2 O 4 (RE = rare earth) compounds is yet limited to ∼0.9 K, which more or less hampers a complete understanding of the relevant magnetic frustrations and spin interactions and an exploration of potential interesting properties. Here we report on a new frustrated member to the family, SrTb 2 O 4 with a record T N = 4.28(2) K, and an experimental study of the magnetic interacting and frustrating mechanisms by polarized and unpolarized neutron scattering. The compound SrTb 2 O 4 displays an incommensurate antiferromagnetic (AFM) order with a transverse wave vector Q 0.5K = (0.5924(1), 0.0059(1), 0) albeit with AFM partially-ordered moments, 1.92(6) μ B at 0.5 K, stemming from only one of the two inequivalent Tb sites mainly by virtue of their different octahedral distortions. The localized moments are confined to the bc plane, 11.9(66) • away from the b axis probably by single-ion anisotropy. We reveal that this AFM order is dominated mainly by dipole-dipole interactions and disclose that the octahedral distortion, nearest-neighbour (NN) ferromagnetic (FM) arrangement, different next NN FM and AFM configurations, and in-plane anisotropic spin correlations are vital to the magnetic structure and associated multiple frustrations. The discovery of the thus far highest AFM transition temperature renders SrTb 2 O 4 a new friendly frustrated platform in the family for studying the nature of magnetic interactions and frustrations and exploring potential macroscopic functionalities and new quantum states.

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Section: Discussionsupporting

confidence: 70%

Incommensurate antiferromagnetic order in the manifoldly-frustrated SrTb2O4 with transition temperature up to 4.28 K

Zhang

Senyshyn

et al. 2014

Front. Phys.

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“…Intriguingly, the temperature where the QEP area and height are maxima, T max , does not coincide with the bulk-average T S , contrary to other parent FeSCs [4,26]. This deviation is likely related to the broad T interval where tetragonal and orthorhombic domains coexist and fluctuate [41]. In this scenario, while the QEP intensity per orthorhombic unit volume is expected to be reduced on cooling, the inverse tendency is found for the remaining tetragonal domains, leading to T max < T S .…”

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confidence: 89%

Nematic fluctuations and phase transitions in LaFeAsO: A Raman scattering study

et al. 2017

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Raman scattering experiments on LaFeAsO with splitted antiferromagnetic (TAF M = 140 K) and tetragonal-orthorhombic (TS = 155 K) transitions show a quasi-elastic peak (QEP) in B2g symmetry (2 Fe tetragonal cell) that fades away below ∼ TAF M and is ascribed to electronic nematic fluctuations. A scaling of the reported shear modulus with the T −dependence of the QEP height rather than the QEP area indicates that magnetic degrees of freedom drive the structural transition. The large separation between TS and TAF M in LaFeAsO compared with their coincidence in BaFe2As2 manifests itself in slower dynamics of nematic fluctuations in the former. The discovery of Fe-based superconductors (FeSCs) with high transition temperatures (above 100 K in FeSe films [1]) triggered much interest on these materials [2][3][4][5]. Nematicity, characterized by large in-plane electronic transport anisotropy [6], is normally observed below a tetragonal-orthorhombic transition temperature T S , and seems to be also present in other high-T c superconductors [7]. Also, divergent nematic susceptibility in the optimal doping regime suggests that nematic fluctuations play an important role in the superconducting pairing mechanism [8]. Thus, investigations of the nematic order and fluctuations in FeSCs and their parent materials are pivotal to unraveling the origin of high-T c superconductivity. Clearly, it is necessary to identify the primary order parameter associated with the nematic phase [4, 5]. A relation between nematicity and magnetism is suggested by the near coincidence between T S and the antiferromagnetic (AFM) ordering temperature T AF M in some materials, most notably BaFe 2 As 2 with T AF M ∼ T S = 138 K [9,10]. In fact, the magnetic ground state is a stripe AFM phase that breaks the 4-fold tetragonal symmetry of the lattice (see Fig. 1(a)), providing a natural mechanism for electronic anisotropy. On the other hand, T S and T AF M are significantly separated for LaFeAsO (LFAO) (T AF M = 140 K and T S = 155 K) [11][12][13], while FeSe does not order magnetically at ambient pressure but still shows a nematic transition at T S = 90 K [14], motivating suggestions that the nematic transition may be driven by charge/orbital degrees of freedom rather than magnetism in the latter [16,17]. However, even for FeSe the magnetic scenario may still apply [18]. In * Present address: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.Ba(Fe 1−x Co x ) 2 As 2 and other doped systems, the splitting between T AF M and T S increases with doping [9,15]. Overall, the primary order parameter that drives the structural/nematic transition at T S and the dominating mechanism of T AF M /T S separation in parent FeSCs are not fully settled yet.Raman scattering was recently employed as a probe of nematic fluctuations in FeSCs and their parent materials. In A(Fe 1−x Co x ) 2 As 2 (A = Ca, Sr, Ba, Eu) [1, 4,19,21,22,24,25], Ba 1−p K p Fe 2 As 2 [25], FeSe [26,27] and NaFe 1−x Co x As [28], a quasi-elastic ...

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“…For example, the unconventional superconductivity appears normally in materials where the long-range antiferromagnetic (AFM) states are partially or completely suppressed upon hole-or electron-doping, or by pressure. Magnetism is thus connected with the unconventional superconductivity [29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58]. A full and consistent understanding of these interesting experimental observations has yet to be achieved [59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,…”

Section: Introductionmentioning

confidence: 99%

Ground and Applied-Field-Driven Magnetic States of Antiferromagnets

Li,

Tang

2021

Preprint

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As discussed in this chapter, we develop a mean-field mathematical method to calculate the ground states of antiferromagnets and better understand the applied magnetic-field induced exotic properties. Within antiferromagnetic materials competitive and cooperative interactions exist leading to substance extraordinary magnetic states. Our calculations predict that applying a magnetic field to antiferromagnets can switch it from one magnetic state to another. These include antiferromagnetic ground state, spin-flop transition, spin-flopped state, spin-flip transition and spin-flipped state. Our framework successfully demonstrates these phase changes. With this, a map of all equilibrium magnetic ground states, as well as the respective equilibrium phase conditions, are derived.Our study provides insight into the origins of the various magnetic states.

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Anisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction

Cited by 9 publications

References 24 publications

Incommensurate antiferromagnetic order in the manifoldly-frustrated SrTb2O4 with transition temperature up to 4.28 K

Incommensurate antiferromagnetic order in the manifoldly-frustrated SrTb2O4 with transition temperature up to 4.28 K

Nematic fluctuations and phase transitions in LaFeAsO: A Raman scattering study

Ground and Applied-Field-Driven Magnetic States of Antiferromagnets

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