Compositional Studies of Metals with Complex Order by means of the Optical Floating‐Zone Technique

Bauer, Andreas; Benka, Georg; Neubauer, Andreas; Regnat, Alexander; Engelhardt, Alexander; Resch, Christoph; Wurmehl, S.; Blum, Christian; Adams, Terry R.; Chacon, Alfonso; Jungwirth, R.; Georgii, R.; Senyshyn, Anatoliy; Pedersen, Bjørn; Meven, Martin; Pfleiderer, C.

doi:10.1002/pssb.202100159

Cited by 4 publications

(7 citation statements)

References 96 publications

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“…[21,65] For our study, we chose the itinerant-electron antiferromagnet CrB 2 with its rather low Néel temperature T N ¼ 88K, as high-purity single crystals grown by means of optical floating-zone technique were available. [66][67][68] The samples investigated under pressure were cut from the same ingots for which the transport and thermodynamic properties as well as quantum oscillatory and neutron scattering studies were reported previously. [21,69,70] In our study, three different pressure cells were used, notably a piston-cylinder cell for pressures up to 2.2 GPa, a uniaxial pressure cell for pressures up to 0.5 GPa, and a Bridgman cell for measurements up to 8 GPa.…”

Section: Incipient Superconductivity In Crbmentioning

confidence: 99%

“…[ 21,65 ] For our study, we chose the itinerant‐electron antiferromagnet

{CrB}_{2}

with its rather low Néel temperature

T_{normalN} = 88 K

, as high‐purity single crystals grown by means of optical floating‐zone technique were available. [ 66–68 ] The samples investigated under pressure were cut from the same ingots for which the transport and thermodynamic properties as well as quantum oscillatory and neutron scattering studies were reported previously. [ 21,69,70 ]…”

Section: Incipient Superconductivity In Crb2mentioning

confidence: 99%

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High‐Pressure Studies of Correlated Electron Systems

Jorba

Regnat

Tong

et al. 2022

Physica Status Solidi (b)

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Tuning the electronic properties of transition‐metal and rare‐earth compounds by virtue of changes of the crystallographic lattice constants offers controlled access to new forms of order. The development of tungsten carbide (WC) and moissanite Bridgman cells conceived for studies of the electrical resistivity up to 10 GPa, as well as bespoke diamond anvil cells (DACs) developed for neutron depolarization studies up to 20 GPa is reviewed. For the DACs, the applied pressure changes as a function of temperature in quantitative agreement with the thermal expansion of the pressure cell. A setup is described that is based on focusing neutron guides for measurements of the depolarization of a neutron beam by samples in a DAC. The technical progress is illustrated in terms of three examples. Measurements of the resistivity and neutron depolarization provide evidence of ferromagnetic order in SrRuO3 up to 14 GPa close to a putative quantum phase transition. Combining hydrostatic, uniaxial, and quasi‐hydrostatic pressure, the emergence of incipient superconductivity in CrB2 is observed. The temperature dependence of the electrical resistivity in CeCuAl3 is consistent with emergent Kondo correlations and an enhanced coupling of magneto‐elastic excitations with the conduction electrons at low and intermediate temperatures, respectively.

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Section: Incipient Superconductivity In Crbmentioning

confidence: 99%

“…[ 21,65 ] For our study, we chose the itinerant‐electron antiferromagnet

{CrB}_{2}

with its rather low Néel temperature

T_{normalN} = 88 K

Section: Incipient Superconductivity In Crb2mentioning

confidence: 99%

High‐Pressure Studies of Correlated Electron Systems

Jorba

Regnat

Tong

et al. 2022

Physica Status Solidi (b)

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“…Namely, when using a seed crystal with the T element appropriate for the desired handedness, the single crystal with the selected handedness is obtained. [34][35][36] For instance, a right-handed CoSi can be grown by using a right-handed FeSi as a seed crystal. Such ideas of the chirality-controlled crystal growth were indeed demonstrated in a Czochralski method 34) and in a floating zone (FZ) method.…”

Section: Introductionmentioning

confidence: 99%

“…Such ideas of the chirality-controlled crystal growth were indeed demonstrated in a Czochralski method 34) and in a floating zone (FZ) method. 35,36) Intermetallic disillicide compounds TSi 2 with a C40 type chiral hexagonal crystal structure are the next target materials for chirality-controlled crytal growth. Recently, TSi 2 is found to show the CISS effect.…”

Section: Introductionmentioning

confidence: 99%

Chirality-selected crystal growth and spin polarization over centimeters of transition metal disilicide crystals

Kousaka¹,

Sayo²,

Iwasaki³

et al. 2023

Jpn. J. Appl. Phys.

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We performed a chirality-controlled crystal growth of transition metal disilicide NbSi2 and TaSi2 by using a laser-diode-heated floating zone (LDFZ) method. The crystal chirality was evaluated in the crystals of centimeters in length by performing single crystal X-ray diffraction as well as probing a spin polarization originating from chirality-induced spin selectivity (CISS) effect. The crystals of right-handed NbSi2 and of left-handed TaSi2 were obtained in the conventional LDFZ crystal growth, while the left-handed NbSi2 and right-handed TaSi2 crystals were grown by the LDFZ method with the composition-gradient feed rods. The spin polarization via the CISS was observed over centimeters in the NbSi2 single crystals and the sign of the CISS signals was dependent on the chirality of crystals. The correlation between the crystal chirality and CISS signals indicates that the CISS measurements work as a non-destructive method for chirality determination even in centimeter-long specimens.

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“…Recently, the emergence of a high-mobility surface conduction channel at low temperatures was inferred from the electrical transport properties of a series of single crystals of FeSi prepared under systematic variation of the initial iron content using the optical floating-zone technique [19][20][21][22][23]. This observation was corroborated by means of measurements on thin needles grown from tin flux [24] as well as high-resolution tunneling spectroscopy that revealed two in-gap states in the low-temperature regime of the samples grown by the floating-zone technique [25].…”

Section: Introductionmentioning

confidence: 99%

Composition dependence of the specific heat of FeSi

Bürger

Bauer

Pfleiderer

2023

SciPost Phys. Proc.

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Recently, a high-mobility surface conduction channel and in-gap states were identified in the correlated small-gap semiconductor FeSi using electrical transport measurements and high-resolution tunneling spectroscopy. The mobility of the charge carriers in the surface channel is quantitatively reminiscent of topological insulators, but displays a lack of sensitivity to the presence of ferromagnetic impurities as studied by means of a series of single crystals with slightly different starting compositions. Here, we report measurements of the specific heat of these crystals. At low temperatures, a shallow maximum is observed in the specific heat divided by temperature. This maximum is suppressed under magnetic field, characteristic of a Schottky anomaly associated with magnetic impurities. In comparison, the height of this maximum decreases with increasing initial iron content.

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Compositional Studies of Metals with Complex Order by means of the Optical Floating‐Zone Technique

Cited by 4 publications

References 96 publications

High‐Pressure Studies of Correlated Electron Systems

High‐Pressure Studies of Correlated Electron Systems

Chirality-selected crystal growth and spin polarization over centimeters of transition metal disilicide crystals

Composition dependence of the specific heat of FeSi

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