Spin-orbital liquid and quantum critical point in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>La</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>TiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Zhao, Zhiying; Khosravani, Omid; Lee, Minseong; Balicas, Luis; Sun, Xiaofan; Cheng, Jinguang; Brooks, J. S.; Zhou, H. D.; Choi, Eun Sang

doi:10.1103/physrevb.91.161106

Cited by 17 publications

(10 citation statements)

References 35 publications

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“…The absence of a clear signature of dynamical critical behavior at x = 0.2 and 0.3, along with the observation of significant phase separation into paramagnetic and magnetically-ordered regions near their respective transition temperatures indicate that the thermal phase transition for x = 0.2 and 0.3 is likely first-order. This conclusion is further supported by the absence of a sharp divergence of the specific heat at x = 0.12, 0.17, 0.23 and 0.30, as reported previously, near the respective transition temperatures 14 . An increasing broadening of the thermal phase transition with increasing La concentration can also be observed in our magnetometry and neutron data, in the form of an increasing ∆T C /T C (see Table II and the inset to Fig.…”

Section: E Muon Spin Rotationsupporting

confidence: 87%

“…Apparent experimental support for this possibility comes from specific heat, magnetic susceptibility (under hydrostatic pressure), and dielectric constant results for single crystals (for x ≤ 0.3), which were interpreted as indicative of a spin-orbital-liquid state between the FM and AFM phases 14 . More recent work focussed on the lattice and magnetic dynamics in polycrystalline samples of Y 1−x La x TiO 3 15 .…”

Section: Introductionmentioning

confidence: 99%

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Nature of the ferromagnetic-antiferromagnetic transition in Y$_{1-x}$La$_{x}$TiO$_{3}$

Hameed,

El-Khatib,

Olson

et al. 2021

Preprint

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We explore the magnetically-ordered ground state of the isovalently-substituted Mott-insulator Y1−xLaxTiO3 for x ≤ 0.3 via single crystal growth, magnetometry, neutron diffraction, x-ray magnetic circular dichroism (XMCD), muon spin rotation (µSR) and small-angle neutron scattering (SANS). We find that the decrease in the magnetic transition temperature on approaching the ferromagnetic (FM) -antiferromagnetic (AFM) phase boundary at the La concentration xc ≈ 0.3 is accompanied by a strong suppression of both bulk and local ordered magnetic moments, along with a volume-wise separation into magnetically-ordered and paramagnetic regions. The thermal phase transition does not show conventional second-order behavior, since neither a clear signature of dynamic critical behavior nor a power-law divergence of the magnetic correlation length is found for the studied substitution range; this finding becomes increasingly obvious with substitution. Finally, from SANS and magnetometry measurements, we discern a crossover from easy-axis to easy-plane magneto-crystalline anisotropy with increasing La substitution. These results indicate complex changes in magnetic structure upon approaching the phase boundary.

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Section: E Muon Spin Rotationsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Nature of the ferromagnetic-antiferromagnetic transition in Y$_{1-x}$La$_{x}$TiO$_{3}$

Hameed,

El-Khatib,

Olson

et al. 2021

Preprint

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“…[6][7][8][9] In RTiO 3 , R is usually trivalent and Ti is also trivalent with 3d 1 electron configuration. These compounds exhibit orthorhombic distortion due to the relatively large Ti 3+ ion and the small R 3+ ion.…”

mentioning

confidence: 99%

Giant low-field magnetocaloric effect in single-crystalline EuTi0.85Nb0.15O3

2016

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The magnetocaloric effect in ferromagnetic single crystal EuTi0.85Nb0.15O3 has been investigated using magnetization and heat capacity measurements. EuTi0.85Nb0.15O3 undergoes a continuous ferromagnetic phase transition at TC = 9.5 K due to the long range ordering of magnetic moments of Eu2+ (4f7). With the application of magnetic field, the spin entropy is strongly suppressed and a giant magnetic entropy change is observed near TC. The values of entropy change ΔSm and adiabatic temperature change ΔTad are as high as 51.3 J kg−1 K−1 and 22 K, respectively, for a field change of 0–9 T. The corresponding magnetic heating/cooling capacity is 700 J kg−1. This compound also shows large magnetocaloric effect even at low magnetic fields. In particular, the values of ΔSm reach 14.7 and 23.8 J kg−1 K−1 for field changes of 0–1 T and 0–2 T, respectively. The low-field giant magnetocaloric effect, together with the absence of thermal and field hysteresis makes EuTi0.85Nb0.15O3 a very promising candidate for low temperature magnetic refrigeration.

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“…This phenomenology suggests a potential path to realize magnetic QPTs while remaining inside the Mott insulating state via isovalent chemical substitution on the rareearth site [26,27], such as in Sm 1−𝑥 Gd 𝑥 TiO 3 [16] and Y 1−𝑥 La 𝑥 TiO 3 [12,14,17,18]. In principle, there are several possibilities for magnetic QPTs: split transitions from either the AFM or the FM phase to the paramagnetic (PM) phase; split transitions from the AFM or FM phases to a coexistence AFM+FM state; a single first-order AFM to FM transition; or a single second-order AFM to FM transition, which would require fine tuning of parameters.…”

mentioning

confidence: 94%

Strain-tunable metamagnetic critical endpoint in Mott insulating rare-earth titanates

Wang,

Gautreau,

Birol

et al. 2021

Preprint

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Rare-earth titanates are Mott insulators whose magnetic ground state -antiferromagnetic (AFM) or ferromagnetic (FM) -can be tuned by the radius of the rare-earth element. Here, we combine phenomenology and first-principles calculations to shed light on the generic magnetic phase diagram of a chemically-substituted titanate on the rare-earth site that interpolates between an AFM and a FM state. Octahedral rotations present in these perovskites cause the AFM order to acquire a small FM component -and vice-versa -removing any multi-critical point from the phase diagram. However, for a wide parameter range, a first-order metamagnetic transition line terminating at a critical end-point survives inside the magnetically ordered phase. Similarly to the liquid-gas transition, a Widom line emerges from the end-point, characterized by enhanced fluctuations. In contrast to metallic ferromagnets, this metamagnetic transition involves two symmetry-equivalent and insulating canted spin states. Moreover, instead of a magnetic field, we show that uniaxial strain can be used to tune this transition to zero-temperature, inducing a quantum critical end-point.

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Spin-orbital liquid and quantum critical point inY1−xLaxTiO3

Cited by 17 publications

References 35 publications

Nature of the ferromagnetic-antiferromagnetic transition in Y$_{1-x}$La$_{x}$TiO$_{3}$

Nature of the ferromagnetic-antiferromagnetic transition in Y$_{1-x}$La$_{x}$TiO$_{3}$

Giant low-field magnetocaloric effect in single-crystalline EuTi0.85Nb0.15O3

Strain-tunable metamagnetic critical endpoint in Mott insulating rare-earth titanates

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