Craig V. Topping
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View article: Coulomb blockade thermometry based nanocalorimetry
Coulomb blockade thermometry based nanocalorimetry Open
Specific heat is a powerful probe offering insights into the entropy and excitation spectrum of the studied material. While it is well established, a key challenge remains the measurement of microcrystals or thin films, especially in the s…
View article: High- versus Low-Spin Ni<sup>2+</sup> in Elongated Octahedral Environments: Sr<sub>2</sub>NiO<sub>2</sub>Cu<sub>2</sub>Se<sub>2</sub>, Sr<sub>2</sub>NiO<sub>2</sub>Cu<sub>2</sub>S<sub>2</sub>, and Sr<sub>2</sub>NiO<sub>2</sub>Cu<sub>2</sub>(Se<sub>1–<i>x</i></sub>S<sub><i>x</i></sub>)<sub>2</sub>
High- versus Low-Spin Ni<sup>2+</sup> in Elongated Octahedral Environments: Sr<sub>2</sub>NiO<sub>2</sub>Cu<sub>2</sub>Se<sub>2</sub>, Sr<sub>2</sub>NiO<sub>2</sub>Cu<sub>2</sub>S<sub>2</sub>, and Sr<sub>2</sub>NiO<sub>2</sub>Cu<sub>2</sub>(Se<sub>1–<i>x</i></sub>S<sub><i>x</i></sub>)<sub>2</sub> Open
Sr2NiO2Cu2Se2, comprising alternating [Sr2NiO2]2+ and [Cu2Se2]2- layers, is reported. Powder neutron diffraction shows that the N…
View article: Strain-Stabilized (π, π) Order at the Surface of Fe<sub>1+<i>x</i></sub>Te
Strain-Stabilized (π, π) Order at the Surface of Fe<sub>1+<i>x</i></sub>Te Open
A key property of many quantum materials is that their ground state depends sensitively on small changes of an external tuning parameter, e.g., doping, magnetic field, or pressure, creating opportunities for potential technological applica…
View article: CCDC 1456470: Experimental Crystal Structure Determination
CCDC 1456470: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1456469: Experimental Crystal Structure Determination
CCDC 1456469: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1456468: Experimental Crystal Structure Determination
CCDC 1456468: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1456465: Experimental Crystal Structure Determination
CCDC 1456465: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1456466: Experimental Crystal Structure Determination
CCDC 1456466: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1456467: Experimental Crystal Structure Determination
CCDC 1456467: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Muon-spin relaxation and AC magnetometry study of the ferrimagnet LaSr2Cr2SbO9
Muon-spin relaxation and AC magnetometry study of the ferrimagnet LaSr2Cr2SbO9 Open
AC susceptibility and muon spin relaxation data have been collected from a polycrystalline sample of LaSr2Cr2SbO9, a perovskite-like compound wherein the unequal distribution of Cr3+ and Sb5+ cations over two crystallographically-distinct …
View article: Evidence for a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>J</mml:mi><mml:mi>eff</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mn>0</mml:mn></mml:mrow></mml:math> ground state and defect-induced spin glass behavior in the pyrochlore osmate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Os</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>
Evidence for a ground state and defect-induced spin glass behavior in the pyrochlore osmate Open
We present AC and DC magnetometry, heat capacity, muon spin relaxation\n($\\mu$SR) and resonant inelastic X-ray scattering (RIXS) studies of the\npyrochlore osmate Y$_2$Os$_2$O$_7$. We observe a non-zero effective moment\ngoverned by $\\sq…
View article: Spin dynamics and field-induced magnetic phase transition in the honeycomb Kitaev magnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>α</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>Li</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>IrO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Spin dynamics and field-induced magnetic phase transition in the honeycomb Kitaev magnet Open
The layered honeycomb iridate $\\alpha$-Li$_2$IrO$_3$ displays an\nincommensurate magnetic structure with counterrotating moments on\nnearest-neighbor sites, proposed to be stabilized by strongly-frustrated\nanisotropic Kitaev interactions…
View article: A.C. susceptibility as a probe of low-frequency magnetic dynamics
A.C. susceptibility as a probe of low-frequency magnetic dynamics Open
The experimental technique of a.c. susceptibility can be used as a probe of magnetic dynamics in a wide variety of systems. Its use is restricted to the low-frequency regime and thus is sensitive to relatively slow processes. Rather than m…
View article: Frustration and Glasslike Character in RIn<sub>1–<i>x</i></sub>Mn<sub><i>x</i></sub>O<sub>3</sub> (R = Tb, Dy, Gd)
Frustration and Glasslike Character in RIn<sub>1–<i>x</i></sub>Mn<sub><i>x</i></sub>O<sub>3</sub> (R = Tb, Dy, Gd) Open
We bring together ac susceptibility and dc magnetization to uncover the rich magnetic field-temperature behavior of a series of rare earth indium oxides, RInO3 (R = Tb, Dy, and Gd). The degree of frustration is much larger than …
View article: Implications of bond disorder in a S=1 kagome lattice
Implications of bond disorder in a S=1 kagome lattice Open
Strong hydrogen bonds such as F···H···F offer new strategies to fabricate molecular architectures exhibiting novel structures and properties. Along these lines and, to potentially realize hydrogen-bond mediated superexchange interactions i…
View article: A. C. magnetic susceptibility in the study of magnetic systems
A. C. magnetic susceptibility in the study of magnetic systems Open
This thesis describes the application of various techniques to the study of magnetic phenomena in condensed matter systems with a particular focus given to a.c. magnetic susceptibility. This is accomplished by briefly discussing the basic …
View article: CCDC 1824114: Experimental Crystal Structure Determination
CCDC 1824114: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Coexistence of magnetism and superconductivity in separate layers of the iron-based superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Li</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>Fe</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>OH</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub><mml:mi>Se</mml:mi></mml:mrow></mml:math>
Coexistence of magnetism and superconductivity in separate layers of the iron-based superconductor Open
The magnetic properties attributed to the hydroxide layer of Li1-xFex(OH)Fe1-ySe have been elucidated by the study of superconducting and nonsuperconducting members of this family. Both ac magnetometry and muon spin relaxation measurements…
View article: Coexistence of magnetism and superconductivity in separate layers of the iron-based superconductor Li_{1-x}Fe_{x}(OH)Fe_{1-y}Se
Coexistence of magnetism and superconductivity in separate layers of the iron-based superconductor Li_{1-x}Fe_{x}(OH)Fe_{1-y}Se Open
The magnetic properties attributed to the hydroxide layer of Li1-xFex(OH)Fe1-ySe have been elucidated by the study of superconducting and nonsuperconducting members of this family. Both ac magnetometry and muon spin relaxation measurements…
View article: Adiabatic physics of an exchange-coupled spin-dimer system: Magnetocaloric effect, zero-point fluctuations, and possible two-dimensional universal behavior
Adiabatic physics of an exchange-coupled spin-dimer system: Magnetocaloric effect, zero-point fluctuations, and possible two-dimensional universal behavior Open
We present the magnetic and thermal properties of the bosonic-superfluid phase in a spin-dimer network using both quasistatic and rapidly changing pulsed magnetic fields. The entropy derived from a heat-capacity study reveals that the puls…
View article: Magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>NiIrO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>CoIrO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>: Magnetic hysteresis with coercive fields of up to 55 T
Magnetic properties ofand: Magnetic hysteresis with coercive fields of up to 55 T Open
We report extraordinarily large magnetic hysteresis loops in the iridates Sr3NiIrO5 and Sr3CoIrO6. We find coercive magnetic fields of up to 55 T with switched magnetic moments ≈1??B per formula unit in Sr3NiIrO6 and coercive fields …
View article: Robustness of superconductivity to competing magnetic phases in tetragonal FeS
Robustness of superconductivity to competing magnetic phases in tetragonal FeS Open
We have determined the superconducting and magnetic properties of a\nhydrothermally synthesized powder sample of tetragonal FeS using muon spin\nrotation ({\\mu}SR). The superconducting properties are entirely consistent with\nthose of a r…
View article: The Parent Li(OH)FeSe Phase of Lithium Iron Hydroxide Selenide Superconductors
The Parent Li(OH)FeSe Phase of Lithium Iron Hydroxide Selenide Superconductors Open
Lithiation of hydrothermally synthesized Li1-xFex(OH)Fe1-ySe turns on high-temperature superconductivity when iron ions are displaced from the hydroxide layers by reductive lithiation to fill the vacancies …
View article: Control of the third dimension in copper-based square-lattice antiferromagnets
Control of the third dimension in copper-based square-lattice antiferromagnets Open
Using a mixed-ligand synthetic scheme, we create a family of quasi-two-dimensional antiferromagnets, namely, [Cu(HF2)(pyz)2]ClO4 [pyz = pyrazine], [CuL2(pyz)2](ClO4)2
View article: CCDC 1474091: Experimental Crystal Structure Determination
CCDC 1474091: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1474093: Experimental Crystal Structure Determination
CCDC 1474093: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1429325: Experimental Crystal Structure Determination
CCDC 1429325: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1474090: Experimental Crystal Structure Determination
CCDC 1474090: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1429323: Experimental Crystal Structure Determination
CCDC 1429323: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1474092: Experimental Crystal Structure Determination
CCDC 1474092: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …