Pressure-induced Superconductivity in Elemental Materials

Shimizu, Katsuya; Amaya, Kiichi; Suzuki, N.

doi:10.1143/jpsj.74.1345

Cited by 73 publications

(75 citation statements)

References 65 publications

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“…2,3 Recently, superconductivity with T c values ranging from 2.7 to 10.6 K at ambient pressure has been reported for BiS 2 -based compounds including Bi 4 O 4 S 3 , LnO 1−x F x BiS 2 (Ln = La, Ce, Pr, Nd, Yb), La 1−x M x OBiS 2 (M = Ti, Zr, Hf, Th), Sr 1−x La x FBiS 2 , EuBiS 2 F, and Eu 3 Bi 2 S 4 F 4 . [4][5][6][7][8][9][10][11][12][13][14][15][16] Similar to the cuprate and Febased superconductors, the structure of these compounds is characterized by alternate stacking of superconducting BiS 2 layers and charge-reservoir blocking layers, both of which are tunable by using chemical substitution or applying external pressure.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiS
Fang
¹
,
Yazici
²
,
White
³

et al. 2015
Phys. Rev. B
18
1
24
0
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Electrical resistivity measurements on La1−xSmxO0.5F0.5BiS2 (x = 0.1, 0.3, 0.6, 0.8) have been performed under applied pressures up to 2.6 GPa from 2 K to room temperature. The superconducting transition temperature Tc of each sample significantly increases at a Sm-concentration dependent pressure Pt, indicating a pressure-induced phase transition from a low-Tc to a high-Tc phase. At ambient pressure, Tc increases dramatically from 2.8 K at x = 0.1 to 5.4 K at x = 0.8; however, the Tc values at P > Pt decrease slightly with x and Pt shifts to higher pressures with Sm substitution. In the normal state, semiconducting-like behavior is suppressed and metallic conduction is induced with increasing pressure in all of the samples. These results suggest that the pressure dependence of Tc for the BiS2-based superconductors is related to the lattice parameters at ambient pressure and enable us to estimate the evolution of Tc for SmO0.5F0.5BiS2 under pressure.

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Section: Introductionmentioning

confidence: 99%

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiS
Fang
¹
,
Yazici
²
,
White
³

et al. 2015
Phys. Rev. B
18
1
24
0
View full text Add to dashboard Cite

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“…As metallicity is a necessary condition for superconductivity, generally becomes more likely under pressure [1,2]. Wigner and Huntington [3], already in 1935 suggested the possibility of a metallic modification of hydrogen under very high pressures.…”

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confidence: 99%

High temperature superconductivity in sulfur and selenium hydrides at high pressure

2016

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Abstract. Due to its low atomic mass, hydrogen is the most promising element to search for hightemperature phononic superconductors. However, metallic phases of hydrogen are only expected at extreme pressures (400 GPa or higher). (2015)], shows that metallization of hydrogen can be reached at significantly lower pressure by inserting it in the matrix of other elements. In this work we investigate the phase diagram and the superconducting properties of the H-S systems by means of minima hopping method for structure prediction and density functional theory for superconductors. We also show that Se-H has a similar phase diagram as its sulfur counterpart as well as high superconducting critical temperature. We predict H3Se to exceed 120 K superconductivity at 100 GPa. We show that both H3Se and H3S, due to the critical temperature and peculiar electronic structure, present rather unusual superconducting properties.Under high pressure conditions, insulating and semiconducting materials tend to become metallic, because, with increasing electronic density, the kinetic energy grows faster than the potential energy. As metallicity is a necessary condition for superconductivity, generally becomes more likely under pressure [1,2]. Wigner and Huntington [3], already in 1935 suggested the possibility of a metallic modification of hydrogen under very high pressures. Ashcroft and Richardson predicted [4,5] hydrogen to become metallic under pressure and also the possibility to be a high temperature superconductor. The high critical temperature (T C ) of hydrogen [6-8] is a consequence of its low atomic mass leading to high energy vibrational modes and in turn to a large phase space available for electronphonon scattering to induce superconductivity [9]. However, the estimated metallization pressure [10,11] is beyond the current experimental capabilities [12][13][14][15]. It was only recently that hydrogen-rich compounds (chemically pre-compressed) started to be explored as a way to decrease the tremendous metallization pressure of pure hydrogen [16]. The first system explored experimentally was silane (SiH 4 ) [17]. Soon after, many others materials have been explored experimentally [18][19][20][21] and theoretically [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40].

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“…As for figure (2-c), the lattice constants decline from a=6.09 & b=c=3.03 A° at 0 GPA to a=5.71 & b=c=2.84 A° at 325 GPA, also the total energy value decreases from -1289.1 to -1165. 1 at that values of pressure.…”

Section: The Access To the Superconductor Of Sulfur Hydride ( )mentioning

confidence: 84%

“…The metallicity is a necessary condition for superconductivity where the insulating and semiconducting materials become metallic under high pressure because, with increasing electronic density, the kinetic energy grows faster than the potential energy [1,2]. Wigner and Huntington in 1935 suggested the possibility of a metallic modification of hydrogen under very high pressures [3].…”

Section: Introductionmentioning

confidence: 99%

Relationship between Pressure and both the Lattice Constant and Total Energy for H₃S

Alqahtani¹

2016

CAE

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Recently, researchers have discovered a superconductor of 3 with the critical temperature above 200 K by compressing 2 under pressure above 90 Gpa. Here, we work on three forms of structures for 3 ( cubic, doubled cubic, twin ) to study the impact of high pressure on all of the lattice constants, the total energy, the band structures and the density of states for each form of this compound. We use Castep code to calculate all of the lattice constants, the total energy and to anlys structures and the density of states for each form of 3 under selected values of pressure starte from 0 Gpa to 325 Gpa. We find the relationship between pressure and both the lattice constant & Total Energy for H3S in different styles (cubic, cubic doubled, twin) structures is an inverse. In addition, the highest pressure superconductivity for cubic 3 is 0 Gpa. As for doubled cubic style for 3 , the highest pressure superconductivity is 325 Gpa, where the highest pressure superconductivity for twin 3 is 325 Gpa. General TermsTotal Energy for H3S

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Pressure-induced Superconductivity in Elemental Materials

Cited by 73 publications

References 65 publications

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiS
Fang
¹
,
Yazici
²
,
White
³

et al. 2015
Phys. Rev. B
18
1
24
0
View full text Add to dashboard Cite

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiS
Fang
¹
,
Yazici
²
,
White
³

et al. 2015
Phys. Rev. B
18
1
24
0
View full text Add to dashboard Cite

High temperature superconductivity in sulfur and selenium hydrides at high pressure

Relationship between Pressure and both the Lattice Constant and Total Energy for H₃S

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Pressure-induced Superconductivity in Elemental Materials

Cited by 73 publications

References 65 publications

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiSFang1, Yazici2, White3 et al. 2015Phys. Rev. B181240View full textAdd to dashboardCite

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiSFang1, Yazici2, White3 et al. 2015Phys. Rev. B181240View full textAdd to dashboardCite

High temperature superconductivity in sulfur and selenium hydrides at high pressure

Relationship between Pressure and both the Lattice Constant and Total Energy for H3S

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Product

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About

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiS
Fang
¹
,
Yazici
²
,
White
³

et al. 2015
Phys. Rev. B
18
1
24
0
View full text Add to dashboard Cite

Pressure-induced phase transition inLa1−xSmxO0.5F0.5BiS
Fang
¹
,
Yazici
²
,
White
³

et al. 2015
Phys. Rev. B
18
1
24
0
View full text Add to dashboard Cite

Relationship between Pressure and both the Lattice Constant and Total Energy for H₃S