Acoustic signatures of the phases and phase transitions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Yb</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ti</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>

Bhattacharjee, Subhro; Erfanifam, S.; Green, D.; Naumann, M.; Wang, Zhaosheng; Granovsky, S.A.; Doerr, M.; Wosnitza, J.; Zvyagin, A. A.; Moessner, Roderich; Maljuk, A.; Wurmehl, S.; Büchner, B.; Жерлицын, С.

doi:10.1103/physrevb.93.144412

Cited by 25 publications

(24 citation statements)

References 49 publications

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“…9,14 A number of experimental and theoretical investigations into the true nature of Yb 2 Ti 2 O 7 's ground state described it in widely varying and conflicting fashions: either as lacking 8,[17][18][19][20][21][22][23] or having 7,11,[24][25][26][27] long-range magnetic order, with static 24,26 to slowly fluctuating dynamic [16][17][18][19]21,23,25,28 spins.…”

Section: Introductionmentioning

confidence: 99%

Impact of stoichiometry ofYb2Ti2O7on its physical properties

et al. 2017

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A series of Yb2+xTi2−xO 7−δ doped samples demonstrates the effects of off-stoichiometry on Yb2Ti2O7's structure, properties, and magnetic ground state via x-ray diffraction, specific heat, and magnetization measurements. A stoichiometric single crystal of Yb2Ti2O7 grown by the traveling solvent floating zone technique (solvent = 30 wt% rutile TiO2 and 70 wt% Yb2Ti2O7) is characterized and evaluated in light of this series. Our data shows that upon positive x doping, the cubic lattice parameter a increases and the Curie-Weiss temperature θCW decreases. Heat capacity measurements of stoichiometric Yb2Ti2O7 samples exhibit a sharp, first-order peak at T = 268(4) mK that is suppressed in magnitude and temperature in samples doped off ideal stoichiometry. The full entropy recovered per Yb ion is 5.7 J K −1 ≈ Rln2. Our work establishes the effects of doping on Yb2Ti2O7's physical properties, which provides further evidence indicating that previous crystals grown by the traditional floating zone method are doped off ideal stoichiometry. Additionally, we present how to grow high-quality colorless single crystals of Yb2Ti2O7 by the traveling solvent floating zone growth method.

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Section: Introductionmentioning

confidence: 99%

Impact of stoichiometry ofYb2Ti2O7on its physical properties

et al. 2017

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“…However, in 2016 an experimental result 40 detected, according to authors, structural modifications at temperatures below 1 K, with a first-order transition signature without the existence of changes in the crystalline structure. The other points of the cube of the parameter space of Fig.…”

Section: Comments On the Resultsmentioning

confidence: 98%

Two fluid model in low energy excited states within spin-ice systems

López-Bara

López‐Aguilar

2018

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Excitations in magnetic structures of the so-called spin-ice materials generate two different peaks in the specific heat and anomalies in entropy in the temperature interval between 0 and 1 K. These points are due to the existence of two low-energy excited global states which seem to transit from a bosonic condensate towards a magnetic neutral plasma in a narrow temperature interval between 0.05 ≤ T ≤ 1 K. In this paper, we determine the characteristic features of two states and we analyze the possibilities of existence of a BEC state and its phase transition to the magnetic plasma state from a model of two magnetic charge fluids. From the structural analysis of the many-body excitation states, we obtain theoretical results about entropy and specific heat since these two key physical magnitudes announce the phase transitions. We give criteria for distinguishing if some of these phase transitions is of either first or second order.

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“…For example, a long-range antiferromagnetically ordered state was found in Er 2 Ti 2 O 7 potentially driven by the order-bydisorder mechanism whereas a ferromagnetically ordered state with high sensitivity to small amounts of disorder was observed in Yb 2 Ti 2 O 7 , see, e.g., Refs. [4][5][6] and references therein.…”

Section: Introductionmentioning

confidence: 99%

Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo2F7

et al. 2019

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We report high-frequency/high-field electron spin resonance (ESR) and high-field magnetization studies on single crystals of the bond-disordered pyrochlore NaCaCo2F7. Frequency-and temperature-dependent ESR investigations above the freezing temperature T f ∼ 2.4 K reveal the coexistence of two distinct magnetic phases. A cooperative paramagnetic phase, evidenced by a gapless excitation mode, is found as well as a spin-glass phase developing below 20 K which is associated with a gapped low-energy excitation. Effective g-factors close to 2 are obtained for both modes in line with pulsed high-field magnetization measurements which show an unsaturated isotropic behavior up to 58 T at 2 K. In order to describe the field-dependent magnetization in high magnetic fields, we propose an empirical model accounting for highly anisotropic ionic g-tensors expected for this material and taking into account the strongly competing interactions between the spins which lead to a frustrated ground state. As a detailed quantitative relation between effective g-factors as determined from ESR and the local g-tensors obtained by neutron scattering [Ross et al., Phys. Rev. B 93, 014433 (2016)] is still sought after, our work motivates further theoretical investigations of the low-energy excitations in bond-disordered pyrochlores. I. III. RESULTSA. Electron spin resonance

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Acoustic signatures of the phases and phase transitions inYb2Ti2O7

Cited by 25 publications

References 49 publications

Impact of stoichiometry ofYb2Ti2O7on its physical properties

Impact of stoichiometry ofYb2Ti2O7on its physical properties

Two fluid model in low energy excited states within spin-ice systems

Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo2F7

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