Superconductivity in a New High-Pressure Phase of Scandium

Wittig, J.; Probst, C.; Schmidt, F. A.; Gschneidner, K.A.

doi:10.1103/physrevlett.42.469

Cited by 57 publications

(46 citation statements)

References 8 publications

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“…2 the dependence of T c on pressure for Sc is shown from the present experiment to 74.2 GPa and compared with the previous quasihydrostatic pressure results of Wittig et al [17] to 21.5 GPa. It is worth noting that, in contrast to the results for Y, the dependence of T c on pressure for Sc exhibits an upward (positive) curvature, in spite of the fact that its compressibility decreases with increasing pressure [29].…”

Section: Resultsmentioning

confidence: 80%

“…In this paper we extend the earlier studies [17] on elemental Sc to much higher pressures. T c increases monotonically with pressure, reaching 8.2 K at 74.2 GPa.…”

Section: Introductionmentioning

confidence: 69%

“…Increasing the d-electron concentration in Lu, Y, and Sc by applying high pressure would be expected, therefore, to promote superconductivity. Indeed, Wittig et al were the first to show this to be true for Lu [15,16], Y [5], and Sc [17]. Whereas in La T c (P ) passes through a maximum near 13 K [18,19], that for Y continues to increase to the highest pressure applied (≃ 20 K at 1.2 Mbar).…”

Section: Introductionmentioning

confidence: 99%

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Pressure-induced superconductivity in Sc to74GPa

Hamlin

Schilling

2007

Phys. Rev. B

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Using a diamond anvil cell with nearly hydrostatic helium pressure medium we have significantly extended the superconducting phase diagram T c (P ) of Sc, the lightest of all transition metals. We find that superconductivity is induced in Sc under pressure, T c increasing monotonically to 8.2 K at 74.2 GPa. The T c (P ) dependences of the trivalent d-electron metals Sc, Y, La, and Lu are compared and discussed within a simple s → d charge transfer framework.

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Section: Resultsmentioning

confidence: 80%

“…In this paper we extend the earlier studies [17] on elemental Sc to much higher pressures. T c increases monotonically with pressure, reaching 8.2 K at 74.2 GPa.…”

Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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Pressure-induced superconductivity in Sc to74GPa

Hamlin

Schilling

2007

Phys. Rev. B

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“…Both Sr and Ba are superconductors at high pressure and the critical temperature T C increases with pressure (10). The Sc-II phase was found to be superconducting (11) and recent observations show that T C also increases monotonically with pressure (12). Following through the arguments given above, one can expect Ca to undergo a similar transition to a complex phase at very high pressures.…”

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confidence: 93%

Prediction of incommensurate crystal structure in Ca at high pressure

Arapan

Mao

Ahuja

2008

Proc. Natl. Acad. Sci. U.S.A.

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Ca shows an interesting high-pressure phase transformation sequence, but, despite similar physical properties at high pressure and affinity in the electronic structure with its neighbors in the periodic table, no complex phase has been identified for Ca so far. We predict an incommensurate high-pressure phase of Ca from first principle calculations and describe a procedure of estimating incommensurate structure parameters by means of electronic structure calculations for periodic crystals. Thus, by using the ab initio technique for periodic structures, one can get not only reliable information about the electronic structure and structural parameters of an incommensurate phase, but also identify and predict such phases in new elements.ab initio calculations ͉ alkali metals T he continuous improvement of the high-pressure technique and the advances in the methods of characterization of materials under high pressure have opened new perspectives for materials physics community. The discovery of a series of phases for periodic table elements within the explored interval of pressures (1, 2) have stimulated an increased interest from both experimentalists and theoreticians to understand the unexpected behavior of simple elements under high pressure. Within the alkali and earth-alkaline metals, a series of complex structures at high pressure have been identified and, in particular, the complex phases of Ba-IV (3), Sr-V (4), Rb-IV (5), and K-III (6) have been determined as composite host-guest structures, which are incommensurate along the common axis of host and guest sub-lattices. The occurrence of such complex composite structures in a large number of elements and the robustness of these complex phases over a wide range of pressures and temperatures make the existence of composite incommensurate structures an intrinsic high-pressure phenomenon. Therefore, other elements may undergo similar high-pressure phase transitions. The nature of the transition to a composite structure is not completely understood yet, partly, because such an essential theoretical tool for describing the condensed matter as electronic structure calculations cannot be directly applied to study an incommensurate structure. However, one can perform first-principles calculations on commensurate analogues of an incommensurate phase and, indeed, such calculations can reproduce the phase transition sequence in close agreement with the experiment and provide reliable information about the electronic structure (7,8). Ab initio calculations of Ba-IV commensurate analogue (7) suggest that the transition from a closed, packed structure at low pressure to a more open, complex structure at high pressure might be because of the transfer of electrons from free-electron like s-bands to more directional d-bands. In the Ba-IV phase, the sd-hybridization occurs between the orbitals of two nonequivalent Ba atoms: guest atoms with a more d-like character and host atoms with a more s-like character. Therefore, from the electronic structure perspective, the composite s...

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“…Yttrium [30] and its related s 2 d 1 transition metals Sc, La, and Lu [44], have a positive dT c /dp slope, as shown in …”

Section: S 2 D 1 Transition Metalsmentioning

confidence: 99%

Assembling the puzzle of superconducting elements: a review

Buzea

Robbie

2004

Supercond. Sci. Technol.

156

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Superconductivity in the simple elements is of both technological relevance and fundamental scientific interest in the investigation of superconductivity phenomena. Recent advances in the instrumentation of physics under pressure have enabled the observation of superconductivity in many elements not previously known to superconduct, and at steadily increasing temperatures. This article offers a review of the state of the art in the superconductivity of elements, highlighting underlying correlations and general trends.

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Superconductivity in a New High-Pressure Phase of Scandium

Cited by 57 publications

References 8 publications

Pressure-induced superconductivity in Sc to74GPa

Pressure-induced superconductivity in Sc to74GPa

Prediction of incommensurate crystal structure in Ca at high pressure

Assembling the puzzle of superconducting elements: a review

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