Ferromagnetism and lattice distortions in the perovskite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>YTiO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Knafo, William; Meingast, C.; Boris, A. V.; Popovich, P.; Kovaleva, N. N.; Yordanov, Petar; Maljuk, A.; Kremer, Reinhard K.; Löhneysen, H. v.; Keimer, B.

doi:10.1103/physrevb.79.054431

Cited by 41 publications

(31 citation statements)

References 48 publications

(72 reference statements)

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“…The critical exponents, β and γ, obtained with the conventional Arrott-plot procedure, are also close to those predicted by the mean-field model (see Table I). However, 5 it has been well-established in YTiO 3 that the critical behavior associated with the ferromagnetic ordering of the Ti 3+ spins belong to the 3D Heisenberg universality class 7,8 . In addition, the nearest-neighbor exchange interactions between localized Ti 3+ spins in these ferromagnetic RTiO 3 do not fit into the mean-field model.…”

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confidence: 99%

Critical behavior of the ferromagnetic perovskites RTiO3(R=Dy, Ho, Er, Tm, Yb) by magnetocaloric measurements

Sui

Cheng

et al. 2013

Phys. Rev. B

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Ferromagnetism in perovskites RTiO 3 can be induced by a steric effect. How the subtle local structural change can induce 3D ferromagnetic coupling through Ti-O-Ti superexchange interactions remains controversial. The critical behavior study for the ferromagnetic phase has been made so far only on YTiO 3 since the magnetization measurements are plagued by the contribution from magnetic rare earth.Here we report critical exponents for most ferromagnetic members in the RTiO 3 family by measuring magnetocaloric effect and applying the corresponding scaling laws. Our results indicate that the ferromagnetic coupling in the RTiO 3 can be well-described by the 3D Heisenberg model. PACS numbers: 75.40. Cx, 75.47.Lx, 75.30.Sg 2 For a second-order ferromagnetic phase transition, the critical behavior near T c is characterized by a set of critical exponents 1 α, β, γ, and δassociated with, respectively, the specific heat C, the spontaneous magnetization M s (≡M H=0 ), the initial magnetic susceptibility χ 0 (≡ ∂M/∂H| H=0 ), and the critical isothermal M(H) T=Tc through the following equations:M s (T) ~ |T-T c | β (T < T c ),χ 0 (T) ~ |T-T c | -γ (T > T c ),M(H) ~ H 1/δ (T = T c ).These critical exponents are not independent and the number of independent variables is reduced to two by the following relations:Precise determination of these critical exponents can provide valuable information about a magnetic phase transition, e.g. the range and the dimensionality of the magnetic exchange interactions 2 .As shown in Table I, distinct values of the critical exponents corresponding to different models have been derived theoretically Parallel straight isothermal lines should be restored in the modified Arrott plot with the correct critical exponents.For most homogeneous ferromagnetic systems involving only one magnetization process, the above-mentioned Arrott-plot method is applicable. Otherwise, application of this method requires caution; interpretation of the obtained critical exponents must take into account the specific situation of the magnetic system. For example, in the RTiO 3 (R = Gd, …,Lu, and Y) perovskites, the critical behavior associated with the ferromagnetic ordering of the localized Ti 3+ S = ½ spin can be well understood in terms of the 3D Heisenberg model as shown in YTiO 3 . However, in these ferromagnetic RTiO 3 (R ≠ Y and Lu), the presence of large paramagnetic R 3+ moments near T c makes the Arrott-plot method invalid for the critical-behavior analysis. As shown in the present study on RTiO 3 , the Arrott-plot approach even leads to an opposite conclusion. Interestingly, during the course of our study on the magnetocaloric effect (MCE) of these ferromagnetic RTiO 3 11 , we found that the correct critical exponents can be deduced from the MCE scaling laws 12 .For a magnetic system with a second-order phase transition, Oesterreicher and Parker 14 have proposed a universal relation:where ΔS M PK is the peak value of the magnetic entropy change at different external magnetic fields H.Although subsequent experim...

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confidence: 99%

Critical behavior of the ferromagnetic perovskites RTiO3(R=Dy, Ho, Er, Tm, Yb) by magnetocaloric measurements

Sui

Cheng

et al. 2013

Phys. Rev. B

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“…12 Due to the small size of Y 3+ ion, YTiO 3 has a highly distorted orthorhombic structure. 13,14 From previous studies, it is known that the lattice distortions and orbital orderings are important a) Electronic mail: sdong@seu.edu.cn to understand the FM order in YTiO 3 . 12, 13 Theoretical studies revealed that the FM order in bulk is stabilized by the distorted Ti-O-Ti bond angles and entangled with the orbital ordering.…”

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“…13,14 From previous studies, it is known that the lattice distortions and orbital orderings are important a) Electronic mail: sdong@seu.edu.cn to understand the FM order in YTiO 3 . 12, 13 Theoretical studies revealed that the FM order in bulk is stabilized by the distorted Ti-O-Ti bond angles and entangled with the orbital ordering. 15 Thus, such an orbital ordering driven magnetic phase should be highly sensitive to epitaxial strain.…”

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Orientation-dependent magnetism and orbital structure of strained YTiO3 films on LaAlO3 substrates

Huang

Dong

2015

Journal of Applied Physics

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The strain tuned magnetism of YTiO 3 film grown on the LaAlO 3 (110) substrate is studied by the method of the first principles, and compared with that of the (001)-oriented one. The obtained magnetism is totally different, which is ferromagnetic for the film on the (110) substrate but A-type antiferromagnetic on the (001) one. This orientation-dependent magnetism is attributed to the subtle orbital ordering of YTiO 3 film. The d xz /d yz -type orbital ordering is predominant for the (001) one, but for the (110) case, the d xy orbital is mostly occupied plus a few contribution from the d xz /d yz orbital. Moreover, the lattice mismatch is modest for the (110) case but more serious for the (001) one, which is also responsible for this contrasting magnetism.Recent advances in thin-film deposition techniques have made it possible to fabricate high quality epitaxial oxide thin films and heterostructures. Consequently, it becomes a very promising route to engineer physical properties of oxide thin films by strain. One of the strain effects is that the ground state phases and phase boundaries can be tuned away from the corresponding bulk constituents, which enables us to design "artificial" states with desired properties which are not available in bulk materials. [1][2][3][4] Generally, the strain is imposed by the constraint, namely coherently grown films share the same inplane lattice parameters with the underlying substrates. 5 Especially for the perovskites, due to the strain, the tilting and rotations of the oxygen octahedrons will change, which are crucial to determine the properties of perovskite oxides. 6,7 For example, LaTiO 3 films grown on compressive substrates (e.g. LaAlO 3 ) are predicted to show the A-type antiferromagnetism (A-AFM). In contrast, those grown on tensile substrates (e.g. LaScO 3 ) maintain the G-type antiferromagnetism (G-AFM) as in bulk. 8 It is reported that the compressive LaTiO 3 films may even undergo an insulator-to-metal transition. 9,10 Moreover, the strain effects depend on not only the simple lattice constants (e.g. compressive or tensile), but also the lattice orientations. It has been found that the electronic properties of films can be very different when growing along different orientations. Still taking the LaTiO 3 thin films as an example, the films grown on the (001)-oriented SrTiO 3 substrates show metallic behavior, while the films grown on the (110)-oriented DyScO 3 substrates are highly insulating, although the lattice mismatches are proximate for these two subtrates. 11YTiO 3 is another interesting correlated electronic system, which is a prototypical Mott-insulator with a ferromagnetic (FM) ground state. 12 Due to the small size of Y 3+ ion, YTiO 3 has a highly distorted orthorhombic structure. 13,14 From previous studies, it is known that the lattice distortions and orbital orderings are important a) Electronic mail: sdong@seu.edu.cn to understand the FM order in YTiO 3 . 12,13 Theoretical studies revealed that the FM order in bulk is stabilized by the distorted Ti...

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“…34 However, the number of parameters is so large that solving the (Co 1−x Ni x ) 3 V 2 O 8 problem presents a major challenge. Both parent compounds exhibit a cascade of magnetic phases below 12 K with commensurate and incommensurate wave vectors, indicating the presence of a large number of magnetic interactions.…”

Section: Discussionmentioning

confidence: 99%

Complex magnetoelastic properties in the frustrated kagome-staircase compounds (Co1−xNix)<

et al. 2011

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High-resolution heat-capacity and thermal-expansion measurements on single crystals of the kagome-staircase compounds (Co 1−x Ni x ) 3 V 2 O 8 are presented. The parent compounds Co 3 V 2 O 8 and Ni 3 V 2 O 8 undergo a sequence of first-and second-order magnetic phase transitions. The low-temperature (T 40 K) magnetic entropy evolves monotonically with the doping content x from the full value expected for Ni 2+ S = 1 magnetic moments in Ni 3 V 2 O 8 to only half the value expected for Co 2+ S = 3/2 moments in Co 3 V 2 O 8 . The thermal-expansion coefficients α i (i = a, b, and c) show a strong anisotropy for all (Co 1−x Ni x ) 3 V 2 O 8 compounds. The lowtemperature expansivities indicate that Co doping (Ni doping) yields changes similar to uniaxial pressures along a or b (c). Linear Grüneisen parameters i are extracted for the three main axes i and are found to exhibit a complex temperature and doping dependence. For each axis, i and α i exhibit a sign change at low temperature at the critical concentration x c 0.25 where the incommensurate magnetic propagation vector changes. Our study motivates further investigations to understand how the multiple and complex parameters such as magnetic frustration, magnetic anisotropy, and mixture of S = 1 and 3/2 ions affect the rich magnetoelastic properties of (Co 1−x Ni x ) 3 V 2 O 8 .

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Ferromagnetism and lattice distortions in the perovskiteYTiO3

Cited by 41 publications

References 48 publications

Critical behavior of the ferromagnetic perovskites RTiO3(R=Dy, Ho, Er, Tm, Yb) by magnetocaloric measurements

Critical behavior of the ferromagnetic perovskites RTiO3(R=Dy, Ho, Er, Tm, Yb) by magnetocaloric measurements

Orientation-dependent magnetism and orbital structure of strained YTiO3 films on LaAlO3 substrates

Complex magnetoelastic properties in the frustrated kagome-staircase compounds (Co1−xNix)<

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