Unconventional transport properties of the itinerant ferromagnet 
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Roy, Susmita; Khan, N.; Mandal, P.

doi:10.1103/physrevb.98.134428

Cited by 11 publications

(9 citation statements)

References 48 publications

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“…EuTiO3 shows G-type antiferromagnetism 40,41 below 5.3K or 5.5K and quantum PE behavior. 38 Experimentally, ferromagnetism is reported in La, Nb, H, and Cr-doped EuTiO3 24,[56][57][58] and an epitaxial EuTiO3 film with an elongated c-axis. 59 Moreover, an FM and FE phase has been realized in an epitaxial film on a DyScO3 substrate using 1.1% biaxial tensile strain.…”

Section: Combined Effects Of Doping and Strain On Eutio3-xhx Filmsmentioning

confidence: 99%

Metallic ferroelectric-ferromagnetic multiferroics in strained EuTiO3−xHx

Shen

2020

Phys. Rev. B

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Polar metals are defined by the coexistence of metallicity and polar crystal structure. They have potential applications in non-linear optics, ferroelectric devices, and quantum devices. Meanwhile, ferroelectric-ferromagnetic (FE-FM) multiferroics display simultaneous ferroelectricity and ferromagnetism, leading to new technologies in information storage. It remains an open question whether metallicity, ferroelectricity, and ferromagnetism can coexist in a single domain of a material. EuTiO3 is actively studied for potential applications in magnetic sensors, memories, magneto-optical devices, and energy conversion devices. It stabilizes at a multi-critical equilibrium and exhibits a rich range of intriguing properties. Here, using the results from hybrid density functional theory calculations, we report metallic FE-FM multiferroics in strain-engineered epitaxial EuTiO3 with H doping. The emergence of the magnetism in polar metals provides a new degree of freedom to control these materials in applications. The underlying mechanism for the coexistence of metallicity, ferroelectricity, and ferromagnetism is discussed. The ferromagnetism in metallic EuTiO3-xHx is explained by the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, which agrees with experiments. The coexistence of metallicity and ferroelectricity is allowed because the electrons at the Fermi level are weakly coupled to the ferroelectric distortion. Our results suggest that the combined effect of strain and doping is responsible for achieving EuTiO3-based metallic FE-FM multiferroics and may provide a new way for obtaining metallic FE-FM multiferroics in other materials.

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Section: Combined Effects Of Doping and Strain On Eutio3-xhx Filmsmentioning

confidence: 99%

Metallic ferroelectric-ferromagnetic multiferroics in strained EuTiO3−xHx

Shen

2020

Phys. Rev. B

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“…this context, EuTi 1−x Nb x O 3 is found to be the ideal candidate because it is a 'bad' metal and at the same time, a ferromagnet with low T c ∼ 9.5 K for x = 0.15 [4].…”

mentioning

confidence: 99%

“…There has been a considerable amount of theoretical and experimental work done for understanding the nature of the ground state in this family [7][8][9][10]. The details of such prior work can be found in an earlier publication [4]. Among the perovskites, EuTiO 3 with unique divalent rare-earth ion Eu and tetravalent Ti has generated substantial interest since the discovery of magnetoelectric coupling in this compound below the antiferromagnetic (AFM) transition temperature T N = 5.5 K [11][12][13][14][15][16].…”

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confidence: 99%

Temperature dependent transport spin-polarization in the low Curie temperature complex itinerant ferromagnet EuTi_1−xNb_xO₃

Kamboj¹,

Roy²,

Roy³

et al. 2019

J. Phys.: Condens. Matter

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The physical systems with ferromagnetism and ‘bad’ metallicity hosting unusual transport properties are playgrounds of novel quantum phenomena. Recently EuTi1−xNbxO3 emerged as a ferromagnetic system where non-trivial temperature dependent transport properties are observed due to coexistence and competition of various magnetic and non-magnetic scattering processes. In the ferromagnetic state, the resistivity shows a T2 temperature dependence possibly due to electron–magnon scattering and above the Curie temperature , the dependence changes to T3/2 behaviour indicating a correlation between transport and magnetic properties. In this paper, we show that the transport spin-polarization () in EuTi1−xNbxO3, a low Curie temperature ferromagnet, is as high (∼40%) as that in some of the metallic ferromagnets with high Curie temperatures. In addition, owing to the low Curie temperature of EuTi1−xNbxO3, the temperature (T) dependence of could be measured systematically up to which revealed a proportionate relationship with magnetization versus T. This indicates that such proportionality is far more universally valid than the ferromagnets with ideal parabolic bands. Furthermore, our band structure calculations not only helped to understand the origin of such high spin polarization in EuTi1−xNbxO3 but also provided a route to estimate the Hubbard U parameter in complex metallic ferromagnets in general using experimental inputs.

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“…On the other hand, for a complete understanding of such temperature evolution up to the Curie temperature (T c ), it is important to have a ferromagnet where T c falls within the low-temperature limit where such measurements are possible. In this context, EuTi 1−x Nb x O 3 is found to be the ideal candidate because it is a "bad" metal and at the same time, a ferromagnet with low T c ∼ 9.5 K for x = 0.15 [41].…”

mentioning

confidence: 99%

“…The itinerant Nb-4d electrons mediate the Ruderman-Kittel-Kasuya-Yoshida exchange interaction between the Eu 2+ ions, and the FM ground state emerges. [41] The EuTi 1−x Nb x O 3 with x = 0.15 (U Eu = 3.5 and U Ti/Nb = 2 eV) shown in Figure 4(a) becomes FM metal [Figure 4(b)], and we estimate the transport spin polarization in the ballistic limit. The magnetic moment of 6.85 µ B at the Eu-site is in agreement with an earlier experiment, [35] which arises from the localized Eu-4f orbitals [Figure 4 N ↑ (E F ) = 0.574 states/eV/unit-cell which is 68% higher than the N ↓ (E F ).…”

mentioning

confidence: 99%

High spin-polarization in the low Curie temperature complex itinerant ferromagnet EuTi$_{1-x}$Nb$_x$O$_3$

Kamboj,

Roy,

Roy

et al. 2019

Preprint

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Unconventional transport properties of the itinerant ferromagnet EuTi1−xNbxO3(x=0.10

Cited by 11 publications

References 48 publications

Metallic ferroelectric-ferromagnetic multiferroics in strained EuTiO3−xHx

Metallic ferroelectric-ferromagnetic multiferroics in strained EuTiO3−xHx

Temperature dependent transport spin-polarization in the low Curie temperature complex itinerant ferromagnet EuTi_1−xNb_xO₃

High spin-polarization in the low Curie temperature complex itinerant ferromagnet EuTi$_{1-x}$Nb$_x$O$_3$

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Unconventional transport properties of the itinerant ferromagnet EuTi1−xNbxO3(x=0.10

Cited by 11 publications

References 48 publications

Metallic ferroelectric-ferromagnetic multiferroics in strained EuTiO3−xHx

Metallic ferroelectric-ferromagnetic multiferroics in strained EuTiO3−xHx

Temperature dependent transport spin-polarization in the low Curie temperature complex itinerant ferromagnet EuTi1−x Nb x O3

High spin-polarization in the low Curie temperature complex itinerant ferromagnet EuTi$_{1-x}$Nb$_x$O$_3$

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Temperature dependent transport spin-polarization in the low Curie temperature complex itinerant ferromagnet EuTi_1−xNb_xO₃