Magnetic Behavior of a Mott-Insulator YVO<sub>3</sub>

Kawano, H.; Yoshizawa, H.; Ueda, Yutaka

doi:10.1143/jpsj.63.2857

Cited by 92 publications

(100 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2). While this behavior reproduces qualitatively the first order transition observed in YVO 3 [15,16], its quantitative description requires a careful consideration of lattice and spin entropy contributions to the free energy F . These effects are expected to reduce the transition temperature T * down to experimental values.…”

mentioning

confidence: 56%

“…c 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 Next we consider the reasons for the stability of the G-phase in YVO 3 . Unlike LaVO 3 with almost equal V-V bonds [14], this compound crystalizes in the distorted structure [14,15], indicating that the JT effect plays a significant role. It was suggested that energy may be gained due to C-type orbital ordering, with a and b orbitals staggered in (a, b) planes and repeated along c-axis, while n ic = 1 [16][17][18].…”

mentioning

confidence: 90%

“…The magnetic order in LaVO 3 is C-type [ferromagnetic chains along c-axis which stagger within (a, b) planes], with the Néel temperature T N = 140 K [13,14], while it is staggered in all three directions (G-type) in YVO 3 at T < 77 K and C-type at higher temperatures 77 < T < 114 K [14][15][16]. The C-phase is particularly surprising as arising from a practically undistorted structure of LaVO 3 at T > T N [14].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Spin Order due to Orbital Fluctuations: Cubic Vanadates

2001

View full text Add to dashboard Cite

We investigate the highly frustrated spin and orbital superexchange interactions in cubic vanadates. The fluctuations of t2g orbitals trigger a novel mechanism of ferromagnetic interactions between spins S = 1 of V 3+ ions along one of the cubic directions which operates already in the absence of Hund's rule exchange JH , and leads to the C-type antiferromagnetic phase in LaVO3. The Jahn-Teller effect can stabilize the orbital ordering and the G-type antiferromagnetic phase at low temperatures, but large entropy due to orbital fluctuations favors again the C-phase at higher temperatures, as observed in YVO3.PACS numbers: 75.30. Vn, 71.27.+a, 75.30.Et, Large Coulomb interactions play a crucial role in transition metal oxides, and are responsible for the collective behavior of strongly correlated d electrons which localize in Mott-Hubbard (or charge-transfer) insulators [1]. Such localized electrons may occupy degenerate orbital states which makes it necessary to consider orbital degrees of freedom at equal footing with electron spins, and leads to the effective (superexchange) spin-orbital models to describe the low-energy physics [2][3][4]. A remarkable feature of these models is that the superexchange interaction is highly frustrated on a cubic lattice, which was recognized as the origin of novel quantum effects in transition metal oxides [5]. In case of e g orbital systems this frustration is likely removed by orbital order due to order-out-ofdisorder mechanism, which maximizes the energy gain from quantum spin fluctuations [6]. Moreover, quantum effects among e g orbitals are largely suppressed by the Jahn-Teller (JT) effect in real systems, which together with superexchange often leads to structural phase transitions accompanied by a certain ordering of occupied orbitals, supporting particular magnetic structures. Some well known examples are systems with degenerate e g orbitals filled either by one hole (KCuF 3 ), or by one electron (LaMnO 3 ), which order antiferromagnetically well below the structural transition.The transition metal oxides with partly filled t 2g orbitals exhibit different and more interesting phenomena. This occurs due to the relative weakness of the JT coupling in this case, and due to the higher degeneracy and additional symmetry of t 2g orbitals [7]. As a result, the orbitals may form the coherent orbital-liquid ground state stabilized by quantum effects, as observed in the spin S = 1/2 Mott-insulator LaTiO 3 [8]. It is puzzling what happens when the t 2g orbitals are filled by two electrons, as in vanadium oxides. On one hand, the occupied t 2g orbitals are known to order in non-cubic vanadium compounds, such as LiVO 2 [9] and V 2 O 3 [10]. In fact, the first spin-orbital model for V 2 O 3 with spins s = 1/2 was proposed over twenty years ago [11], but later it was realized that J H at V 3+ (d 2 ) ions is large [12], and the relevant model has to involve S = 1 spins [10]. On the other hand, the situation in cubic systems might be very different as all the bonds are a priori magnetica...

show abstract

mentioning

confidence: 56%

mentioning

confidence: 90%

mentioning

confidence: 99%

See 1 more Smart Citation

Spin Order due to Orbital Fluctuations: Cubic Vanadates

2001

View full text Add to dashboard Cite

show abstract

“…The insulating Y 1−x La x VO 3 , a JT active system, has been of considerable interest due to its complex phase diagram [5][6][7][8][9][10][11][12][13] associated with orbital physics [14][15][16][17][18][20][21][22]. With cooling, the parent compound, YVO 3 , undergoes a transition to a G-type orbital ordering (anti-phase ordering along the c-axis, G-OO) at T OO ∼ 200 K, followed by a C -type antiferromagnetic spin ordering at T N ∼ 116 K (C-SO) and finally to an orbital flipping transition at T CG ∼ 77 K with C -type orbital ordering (in-phase ordering along the c-axis, C-OO) and G-type spin ordering (G-SO) [19,20]. The transitions in the orbital and magnetic degrees of freedom are coupled with structural transitions.…”

Section: Introductionmentioning

confidence: 99%

Y1−xLaxVO3: Effects of doping on orbital ordering

et al. 2014

View full text Add to dashboard Cite

The effects of isovalent doping on orbital ordering in the perovskite Y1−xLaxVO3 was investigated using neutron diffraction and the pair distribution function analysis. YVO3 is a prototype for orbital ordering, exhibiting two consecutive transitions to G-type and C-type ordering with decreasing temperature. Evidence for local orbital ordering above the transition temperature of TOO ∼ 200 K is presented, obtained from the temperature dependence of the oxygen-oxygen octahedral correlations. This suggests that locally, G-type orbital ordering is present above the TOO temperature but it is short-range. With doping, it is expected that orbital ordering disappears altogether. By 30 % of doping as in Y0.7La0.3VO3, even though no orbital ordering is expected, we find that locally, C-type orbital correlations are most likely present below the magnetic transition temperature, TN , allowing for a direct paramagnetic to orbitally ordered/antiferromagnetic transition in this composition.

show abstract

“…It is a Mott insulator where the 3d V 3+ magnetic moments order antiferromagnetically (AF) below T N ¼ 116 K. At temperatures higher than T S ¼ 77 K the spin order (SO) is C-type AF (ferromagnetic coupling along c-axis and AF within the ab planes), whereas below T S a change to a G-type AF structure (AF coupling in all directions) takes place through a first-order structural phase transition accompanied by a change in the unit cell volume [1]. A Jahn-Teller-ordered state at low temperature evidences the existence of orbital ordering (OO) which symmetry changes at T S from G-type (all d xy orbitals occupied and alternatively occupied d yz and d zx ones) to C-type (alternative occupation within ab planes and the same along c-axis) while cooling.…”

mentioning

confidence: 99%

Lattice effects in YVO3 single crystal

Marquina

Sikora

Ibarra

et al. 2005

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

In this paper we report on the lattice effects in the Mott insulator yttrium orthovanadate (YVO 3 ). Linear thermal expansion and magnetostriction experiments have been performed on a single crystal, in the temperature range from 5 K to room temperature. The YVO 3 orders antiferromagnetically at T N ¼ 116 K and orbital ordering was reported to appear below T OO ¼ 196 K. A first-order structural phase transition takes place at T S ¼ 77 K, accompanied by changes in the antiferromagnetic type of ordering as well as in the orbital-ordering type. Our results reveal that the thermal expansion measurement technique is a very powerful tool in order to clearly detect the existence of the above-mentioned transitions. The magnetostriction results point to the stability of the low-temperature-magnetic ground state under such high applied magnetic field. r

show abstract

Magnetic Behavior of a Mott-Insulator YVO₃

Cited by 92 publications

References 13 publications

Spin Order due to Orbital Fluctuations: Cubic Vanadates

Spin Order due to Orbital Fluctuations: Cubic Vanadates

Y1−xLaxVO3: Effects of doping on orbital ordering

Lattice effects in YVO3 single crystal

Contact Info

Product

Resources

About

Magnetic Behavior of a Mott-Insulator YVO3

Cited by 92 publications

References 13 publications

Spin Order due to Orbital Fluctuations: Cubic Vanadates

Spin Order due to Orbital Fluctuations: Cubic Vanadates

Y1−xLaxVO3: Effects of doping on orbital ordering

Lattice effects in YVO3 single crystal

Contact Info

Product

Resources

About

Magnetic Behavior of a Mott-Insulator YVO₃