Explanipedia

Observation of suppressed viscosity in the normal state of 3He due to superfluid fluctuations Open

Rakin N. Baten, Yefan Tian, Eric N. Smith, Erich J. Mueller, J. M. Parpia · 2023

Evidence of fluctuations in transport have long been predicted in 3 He. They are expected to contribute only within 100 μ K of T c and play a vital role in the theoretical modeling of ordering; they encode details about the Fermi liquid pa…

Observation of suppressed viscosity in the normal state of 3He due to superfluid fluctuations Open

Rakin N. Baten, Yefan Tian, Eric B. Smith, Erich J. Mueller, J. M. Parpia · 2023

By monitoring the quality factor of a quartz tuning fork oscillator we have observed a fluctuationd-driven reduction in the viscosity of bulk ³He in the normal state near the superfluid transition temperature, T_c. The…

Supercooling of the A phase of 3He Open

Yefan Tian, Dmytro Lotnyk, Anna Eyal, Kuang Zhang, Nikolay Zhelev , et al. · 2023

Because of the extreme purity, lack of disorder, and complex order parameter, the first-order superfluid 3 He A–B transition is the leading model system for first order transitions in the early universe. Here we report on the path dependen…

Observation of suppressed viscosity in the normal state of $^3$He due to superfluid fluctuations Open

Rakin N. Baten, Yefan Tian, Eric N. Smith, Erich J. Mueller, J. M. Parpia · 2022

By monitoring the quality factor of a quartz tuning fork oscillator we have observed a fluctuation-driven reduction in the viscosity of bulk $^3$He in the normal state near the superfluid transition temperature, $T_c$. These fluctuations, …

Mixed Convection of Fractional Nanofluids Considering Brownian Motion and Thermophoresis Open

Mingwen Chen, Yefan Tian, Weidong Yang, Xuehui Chen · 2022

In this paper, the mixed convective heat transfer mechanism of nanofluids is investigated. Based on the Buongiorno model, we develop a novel Cattaneo–Buongiorno model that reflects the non-local properties as well as Brownian motion and th…

Supercooling of the A phase of 3He} Open

Yefan Tian, Dmytro Lotnyk, Anna Eyal, Kuang Zhang, Nikolay Zhelev , et al. · 2022

Because of the extreme purity, lack of disorder, and complex order parameter, the first-order superfluid ³He A-B transition is the leading model system for first order transitions in the early universe. Here we report on the pat…

NMR determination of Van Hove singularity and Lifshitz transitions in the nodal-line semimetal ZrSiTe Open

Yefan Tian, Yanglin Zhu, Rui Li, Zhiqiang Mao, Joseph H. Ross · 2021

We have applied nuclear magnetic resonance spectroscopy to study the\ndistinctive network of nodal lines in the Dirac semimetal ZrSiTe. The low-$T$\nbehavior is dominated by a symmetry-protected nodal line, with NMR providing a\nsensitive …

Gap-Opening Transition in Dirac Semimetal Open

Yefan Tian, Nader Ghassemi, Joseph H. Ross · 2021

We apply ^{125}Te nuclear magnetic resonance (NMR) spectroscopy to investigate the Dirac semimetal ZrTe_{5}. With the NMR magnetic field parallel to the b axis, we observe significant quantum magnetic effects. These include an abrupt drop …

Path-Dependent Supercooling of the Superfluid Transition Open

Dmytro Lotnyk, Anna Eyal, Nikolay Zhelev, Abhilash Thanniyil Sebastian, Yefan Tian , et al. · 2021

We examine the discontinuous first-order superfluid ^{3}He A to B transition in the vicinity of the polycritical point (2.232 mK and 21.22 bar). We find path-dependent transitions: cooling at fixed pressure yields a well-defined transition…

NMR Studies of Advanced Thermoelectric Materials and Topological Chalcogenides Open

Yefan Tian · 2021

In this dissertation, NMR techniques combined with various experimental and computational techniques were applied to investigate materials systems including advanced thermoelectric ma- terials and topological chalcogenides. Among thermoele…

Topological nodal line in demonstrated by nuclear magnetic resonance Open

Yefan Tian, Nader Ghassemi, Joseph H. Ross · 2020

In this work, we report nuclear magnetic resonance (NMR) combined with\ndensity functional theory (DFT) studies of the transition metal dichalcogenide\nZrTe$_2$. The measured NMR shift anisotropy reveals a quasi-2D behavior\nconnected to a…

Magnetocaloric Effect in a Frustrated Gd-Garnet with No Long-Range Magnetic Order Open

Naveen Kumar Chogondahalli Muniraju, Raju Baral, Yefan Tian, Rui Li, Narayan Poudel , et al. · 2020

In this paper, the hyperkagome lattice of Gd spins in a garnet compound, Gd₃CrGa₄O₁₂, is studied using bulk measurements and density functional computations, and the observation of large magnetocaloric effe…

Defect charging and resonant levels in half-Heusler Nb1−Ti FeSb Open

Yefan Tian, F. G. Vagizov, Nader Ghassemi, Wuyang Ren, Hangtian Zhu , et al. · 2020

Half-Heusler thermoelectric materials: NMR studies Open

Yefan Tian, Nader Ghassemi, Wuyang Ren, Hangtian Zhu, Shan Li , et al. · 2020

We report 59Co, 93Nb, and 121Sb nuclear magnetic resonance measurements combined with density functional theory (DFT) calculations on a series of half-Heusler semiconductors, including NbCoSn, ZrCoSb, TaFeSb, and NbFeSb, to better understa…

Accelerated design of Fe-based soft magnetic materials using machine learning and stochastic optimization Open

Yuhao Wang, Yefan Tian, Tanner Kirk, Omar Laris, Joseph H. Ross , et al. · 2020

Copper-Ion Dynamics and Phase Segregation in Cu-Rich Tetrahedrite: an NMR Study Open

Nader Ghassemi, Yefan Tian, Xu Lu, Yanci Yan, Xiaoyuan Zhou , et al. · 2020

$^{63}$Cu NMR measurements are reported for the Cu-rich phase of \ch{Cu_{12+x}Sb4S13} ($x \lesssim 2$) and compared to \ch{Cu12Sb4S13}. We identify the NMR signatures of the phase segregation into Cu-poor ($x \approx 0$) and Cu-rich ($x \l…

NMR investigation of topological quantum material ZrTe5 Open

Yefan Tian, Nader Ghassemi, Joseph H. Ross · 2020

Defect charging and resonant states in half-Heusler Nb$_{1-x}$Ti$_x$FeSb Open

Yefan Tian, F. G. Vagizov, Nader Ghassemi, Wuyang Ren, Hangtian Zhu , et al. · 2019

Copper ion dynamics and phase segregation in Cu-rich tetrahedrite: an NMR study Open

Nader Ghassemi, Yefan Tian, Xu Lu, Yanci Yan, Xiaoyuan Zhou , et al. · 2019

$^{63}$Cu NMR measurements are reported for the Cu-rich phase of \ch{Cu_{12+x}Sb4S13} ($x \lesssim 2$) and compared to \ch{Cu12Sb4S13}. We identify the NMR signatures of the phase segregation into Cu-poor ($x \approx 0$) and Cu-rich ($x \l…

Dirac electron behavior and NMR evidence for topological band inversion in Open

Yefan Tian, Nader Ghassemi, Joseph H. Ross · 2019

We report 125Te NMR measurements of the topological quantum material ZrTe5. Spin-lattice relaxation results, well explained by a theoretical model of Dirac electron systems, reveal that the topological characteristic of ZrTe5 is T dependen…

Charge-carrier behavior in Ba-, Sr- and Yb-filled : NMR and transport studies Open

Yefan Tian, Ali A. Sirusi, Sedat Ballıkaya, Nader Ghassemi, Ctirad Uher , et al. · 2019

We report 59Co NMR and transport measurements on n-type filled skutterudites BaxYbyCo4Sb12 and AxCo4Sb12 (A=Ba or Sr), promising thermoelectric materials. The results demonstrate consistently that a shallow defect level near the conduction…

Accelerated design of Fe-based soft magnetic materials using machine learning and stochastic optimization Open

Yefan Tian, Yuhao Wang, Joseph Ross, Raymundo Arróyave · 2019

Native defects and impurity band behavior in half-Heusler thermoelectric NbFeSb Open

Yefan Tian, Hangtian Zhu, Wuyang Ren, Nader Ghassemi, Emily Conant , et al. · 2018

Native defects are identified that dominate the electronic behavior and generate impurity-band states in the promising thermoelectric NbFeSb.

NMR and magnetic study of half-Heusler semiconductor NbFeSb Open

Yefan Tian, Hangtian Zhu, Wuyang Ren, Zhifeng Ren, Joseph H. Ross · 2018

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