Jeffrey B. Whalen

National High Magnetic Field Laboratory

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Theo Siegrist

National High Magnetic Field Laboratory

Tiglet Besara

National High Magnetic Field Laboratory

David J. Singh

University of Missouri

Jifeng Sun

First Affiliated Hospital of Henan University of Science and Technology

Nathaniel W. Falb

National High Magnetic Field Laboratory

Daniel Candala Ramírez

University of Würzburg

Jennifer Neu

Oak Ridge National Laboratory

Wangwei Lan

Florida State University

Haidong Zhou

University of Tennessee at Knoxville

Luis Balicas

National High Magnetic Field Laboratory

Cooperative Institutions

Florida State University

National High Magnetic Field Laboratory

Florida A&M University - Florida State University College of Engineering

Tallahassee Orthopedic Clinic

Florida Agricultural and Mechanical University

Oak Ridge National Laboratory

Chinese Academy of Sciences

University of Michigan–Ann Arbor

The University of Tokyo

Texas A&M University

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Chemical pressure effects on structural, magnetic, and transport properties of Mn1−xCoxV<…

Physical Review B (2011)

Andhika Kiswandhi J. S. Brooks Jun Lü Jeffrey B. Whalen Theo Siegrist

We present the low-temperature XRD, susceptibility, specific heat, and resistivity results on single crystal Mn${}_{1\ensuremath{-}x}$Co${}_{x}$V${}_{2}$O${}_{4}$. With increasing Co doping, the chemical pressure related to the decreasing V-V distance drives the system toward the itinerant electron limit, accompanied with the increase of the ferrimagnetic transition temperature and the suppression of the structural distortion. These effects are compared to pressure effects, and show that the V-V distance is the critical parameter controlling the properties of AV${}_{2}$O${}_{4}$.

Ferrimagnetism

Distortion (music)

10.1103/physrevb.84.205138

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Citations (53)

Locating anionic hydrogen in Ba3(Yb,Lu)2O5H2: A combined approach of X-ray diffraction, crystal chemistry, and DFT calculations

Journal of Solid State Chemistry (2023)

Tiglet Besara Daniel Candala Ramírez Jifeng Sun Nathaniel W. Falb Wangwei Lan

Isostructural

Barium

Hydrogen atom

10.1016/j.jssc.2023.123932

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Citations (2)

Hydrogen Storage and Electronic Characterization of Magnesium-Based Intermetallics: Exploratory Flux Synthesis for Advanced Materials

Jeffrey B. Whalen

Characterization

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Citations (3)

ChemInform Abstract: Ba₂TeO: A New Layered Oxytelluride.

ChemInform (2015)

Tiglet Besara D. Ramı́rez Jifeng Sun Jeffrey B. Whalen T. Tokumoto

Abstract Single crystals of the semiconducting Ba 2 TeO are prepared from BaO and Te in a molten Ba flux in the molar ratio of 1:1:20 (steel crucible in evacuated quartz tube, 1000 °C, 20 h; cooling to 820 °C within 50 h).

Crucible (geodemography)

Molar ratio

Slow cooling

10.1002/chin.201509010

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Evolution of the Fermi Surface of Chromium at High Pressure and High Magnetic Fields

Bulletin of the American Physical Society (2012)

Ryan L. Stillwell David Graf William A. Coniglio T. P. Murphy Eric Palm

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Disorder-dependent superconducting phase diagram at high magnetic fields in Fe1+ySexTe

Physical Review B (2011)

T. Gebre Gang Li Jeffrey B. Whalen Benjamin S. Conner Haidong Zhou

We compare the superconducting phase-diagram under high magnetic fields (up to $H=45$ T) of Fe${}_{1+y}$Se${}_{0.4}$Te${}_{0.6}$ single crystals originally grown by the Bridgman-Stockbarger (BRST) technique, which were annealed to display narrow superconducting transitions and the optimal transition temperature ${T}_{c}\ensuremath{\gtrsim}14$ K, with the diagram for samples of similar stoichiometry grown by the traveling-solvent floating-zone technique as well as with the phase diagram reported for crystals grown by a self-flux method. We find that the so-annealed samples tend to display higher ratios ${H}_{c2}/{T}_{c}$, particularly for fields applied along the interplanar direction, where the upper critical field ${H}_{c2}(T)$ exhibits a pronounced concave down curvature followed by saturation at lower temperatures $T$. This last observation is consistent with previous studies indicating that this system is Pauli limited. An analysis of our ${H}_{c2}(T)$ data using a multiband theory suggests the emergence of the Fulde-Ferrel-Larkin-Ovchnikov state at low temperatures. A detailed structural x-ray analysis, reveals no impurity phases but an appreciable degree of mosaicity in as-grown BRST single crystals that remains unaffected by the annealing process. Energy-dispersive x-ray analysis showed that the annealed samples have a more homogeneous stoichiometric distribution of both Fe and Se with virtually the same content of interstitial Fe as the nonannealed ones. Thus we conclude that the excess of Fe, in contrast to structural disorder, contributes to the decrease of the superconducting upper-critical fields of this series. Finally, a scaling analysis of the fluctuation conductivity in the superconducting critical regime, suggests that the superconducting fluctuations have a two-dimensional character in this system.

Stoichiometry

Saturation (graph theory)

Mosaicity

10.1103/physrevb.84.174517

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Citations (15)

Flux Growth and Magnetoresistance Behavior of Rare Earth Zintl Phase EuMgSn

Inorganic Chemistry (2013)

Xiaowei Ma Jun Lü Jeffrey B. Whalen Susan E. Latturner

Reactions of europium and tin in 1:1 Mg/Al mixed flux produce large crystals of EuMgSn. This phase crystallizes with the TiNiSi structure type in orthorhombic space group Pnma (a = 8.0849(7) Å, b = 4.8517(4) Å, c = 8.7504(8) Å, Z = 4, R1 = 0.0137). The crystal structure features europium cations positioned between puckered hexagonal layers comprised of magnesium and tin atoms. Magnetic susceptibility measurements indicate the europium in this phase is divalent, which suggests that the compound is possibly valence-balanced as Eu(2+)Mg(2+)Sn(4-). However, EuMgSn is a metal as indicated by density of states calculations and electrical resistivity behavior. This phase exhibits antiferromagnetic ordering at T(N) = 10.9 K at low field (100 G) and the ordering temperature decreases when a higher magnetic field is applied. ac magnetization and field dependence of resistivity at 4.2 K reveal that there is a spin reorientation at 2 T, in agreement with the metamagnetic transition shown in the dc magnetization versus field data. Temperature dependence of resistivity at 2.5 T indicates that EuMgSn has a large magnetoresistance up to -30% near its magnetic ordering temperature.

Europium

Orthorhombic crystal system

Flux method

10.1021/ic302828p

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Citations (16)

Ba3CrN3H: A New Nitride-Hydride with Trigonal Planar Cr4+

Nathaniel W. Falb Jennifer Neu Tiglet Besara Jeffrey B. Whalen David J. Singh

Single crystal synthesis of a new nitride-hydride Ba3CrN3H. X-ray diffraction, nuclear magnetic resonance, and bond-valance sum and density functional theory calculations confirmed the presence and location of the anionic hydrogen in this compound.

Trigonal crystal system

10.26434/chemrxiv.7418429

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Citations (1)

Hydrogen Storage and Electronic Characterization of Magnesium-Based Intermetallics

Jeffrey B. Whalen

Characterization

Source

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Citations (0)

Competing Phases, Complex Structure, and Complementary Diffraction Studies of R_3-δFeAl_4-xMg_xTt₂ Intermetallics (R = Y, Dy, Er, Yb; Tt = Si or Ge; x < 0.5)

Chemistry of Materials (2013)

Xiaowei Ma Jeffrey B. Whalen Huibo Cao Susan E. Latturner

Four new intermetallic phases R3-δFeAl4-xMgxSi2 (R = Yb, Dy) and R3-δFeAl4-xMgxGe2 (R = Er, Y) were synthesized in Mg/Al (1:1 mol ratio) molten flux. These phases have a new structure type in tetragonal space group P4/mbm (a = 13.3479(9) Å, c = 4.0996(3) Å, Z = 4, and R1 = 0.0176 for Yb2.77FeAl3.72Mg0.28Si2). The structure features iron in trigonal prismatic coordination by aluminum atoms. The prisms share trigonal faces to form chains running along the c-axis, similar to the chains seen in several related structures, including that of the previously reported competing phases R5Mg5Fe4Al12Si6 (R = Gd, Dy, and Y). Occupancies of Mg, Al, and Si sites in Yb2.77FeAl3.72Mg0.28Si2 were determined by single crystal X-ray and neutron diffraction, bond length analysis, and comparison to atom positions and bond lengths in the isostructural germanides. Electronic structure calculations indicate these phases are polar intermetallics with pseudogaps near the Fermi level. The magnetic properties of these phases are determined by the rare earth ions. Y3-δFeAl4-xMgxGe2 is Pauli paramagnetic; the Yb3+ cations in Yb2.77FeAl3.72Mg0.28Si2 exhibit Curie–Weiss behavior with no ordering in the temperature range observed. Er3-δFeAl4-xMgxGe2 and Dy3-δFeAl4-xMgxSi2 order antiferromagnetically at TN = 2.8 and 4.0 K, respectively; the former undergoes a spin reorientation at ∼4400 G according to the ac field dependence of magnetization.

Tetragonal crystal system

Isostructural

Orthorhombic crystal system

10.1021/cm401976s

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Citations (9)