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Superconductivity emerging from a suppressed large magnetoresistant state in tungsten ditelluride.

Kang D, Zhou Y, Yi W, Yang C, Guo J, Shi Y, Zhang S, Wang Z, Zhang C, Jiang S, Li A, Yang K, Wu Q, Zhang G, Sun L, Zhao Z - Nat Commun (2015)

Bottom Line: The large magnetoresistance effect originates from a perfect balance of hole and electron carriers, which is sensitive to external pressure.Upon increasing pressure, the positive large magnetoresistance effect is gradually suppressed and turned off at a critical pressure of 10.5 GPa, where superconductivity accordingly emerges.In situ high-pressure Hall coefficient measurements at low temperatures demonstrate that elevating pressure decreases the population of hole carriers but increases that of the electron ones.

View Article: PubMed Central - PubMed

Affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.

ABSTRACT
The recent discovery of large magnetoresistance in tungsten ditelluride provides a unique playground to find new phenomena and significant perspective for potential applications. The large magnetoresistance effect originates from a perfect balance of hole and electron carriers, which is sensitive to external pressure. Here we report the suppression of the large magnetoresistance and emergence of superconductivity in pressurized tungsten ditelluride via high-pressure synchrotron X-ray diffraction, electrical resistance, magnetoresistance and alternating current magnetic susceptibility measurements. Upon increasing pressure, the positive large magnetoresistance effect is gradually suppressed and turned off at a critical pressure of 10.5 GPa, where superconductivity accordingly emerges. No structural phase transition is observed under the pressure investigated. In situ high-pressure Hall coefficient measurements at low temperatures demonstrate that elevating pressure decreases the population of hole carriers but increases that of the electron ones. Significantly, at the critical pressure, a sign change of the Hall coefficient is observed.

No MeSH data available.


Related in: MedlinePlus

Structure information of WTe2 sample at high pressure.(a) X-ray diffraction patterns of WTe2 collected at different pressures, showing no crystal structure transition. (b,c) Pressure dependence of lattice constants (a, b and c). The error bars represent s.d. (d) Volume change as a function of pressure.
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f2: Structure information of WTe2 sample at high pressure.(a) X-ray diffraction patterns of WTe2 collected at different pressures, showing no crystal structure transition. (b,c) Pressure dependence of lattice constants (a, b and c). The error bars represent s.d. (d) Volume change as a function of pressure.

Mentions: We first characterize the structure of the WTe2 sample at ambient pressure. Figure 1a shows the X-ray diffraction (XRD) pattern of a powdered sample that is ground from a few pieces of single crystals. As it can be seen, the Bragg peaks in the pattern can be well indexed by orthorhombic structure. To clarify whether there is a structure change in pressurized WTe2, we perform in situ high-pressure synchrotron XRD measurements. The results shown in Fig. 2a indicate no first-order structure phase transition under pressure up to 20.1 GPa. Then we extract the lattice parameters as a function of pressure, shown in Fig. 2b,c. The pressure dependence of volume also displays in Fig. 2d. It is found that the lattice constants (a, b and c) as well as the volume decrease continuously upon increasing pressure. However, the reduction of c is substantial, compared with those of the in-plane parameters.


Superconductivity emerging from a suppressed large magnetoresistant state in tungsten ditelluride.

Kang D, Zhou Y, Yi W, Yang C, Guo J, Shi Y, Zhang S, Wang Z, Zhang C, Jiang S, Li A, Yang K, Wu Q, Zhang G, Sun L, Zhao Z - Nat Commun (2015)

Structure information of WTe2 sample at high pressure.(a) X-ray diffraction patterns of WTe2 collected at different pressures, showing no crystal structure transition. (b,c) Pressure dependence of lattice constants (a, b and c). The error bars represent s.d. (d) Volume change as a function of pressure.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4525168&req=5

f2: Structure information of WTe2 sample at high pressure.(a) X-ray diffraction patterns of WTe2 collected at different pressures, showing no crystal structure transition. (b,c) Pressure dependence of lattice constants (a, b and c). The error bars represent s.d. (d) Volume change as a function of pressure.
Mentions: We first characterize the structure of the WTe2 sample at ambient pressure. Figure 1a shows the X-ray diffraction (XRD) pattern of a powdered sample that is ground from a few pieces of single crystals. As it can be seen, the Bragg peaks in the pattern can be well indexed by orthorhombic structure. To clarify whether there is a structure change in pressurized WTe2, we perform in situ high-pressure synchrotron XRD measurements. The results shown in Fig. 2a indicate no first-order structure phase transition under pressure up to 20.1 GPa. Then we extract the lattice parameters as a function of pressure, shown in Fig. 2b,c. The pressure dependence of volume also displays in Fig. 2d. It is found that the lattice constants (a, b and c) as well as the volume decrease continuously upon increasing pressure. However, the reduction of c is substantial, compared with those of the in-plane parameters.

Bottom Line: The large magnetoresistance effect originates from a perfect balance of hole and electron carriers, which is sensitive to external pressure.Upon increasing pressure, the positive large magnetoresistance effect is gradually suppressed and turned off at a critical pressure of 10.5 GPa, where superconductivity accordingly emerges.In situ high-pressure Hall coefficient measurements at low temperatures demonstrate that elevating pressure decreases the population of hole carriers but increases that of the electron ones.

View Article: PubMed Central - PubMed

Affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.

ABSTRACT
The recent discovery of large magnetoresistance in tungsten ditelluride provides a unique playground to find new phenomena and significant perspective for potential applications. The large magnetoresistance effect originates from a perfect balance of hole and electron carriers, which is sensitive to external pressure. Here we report the suppression of the large magnetoresistance and emergence of superconductivity in pressurized tungsten ditelluride via high-pressure synchrotron X-ray diffraction, electrical resistance, magnetoresistance and alternating current magnetic susceptibility measurements. Upon increasing pressure, the positive large magnetoresistance effect is gradually suppressed and turned off at a critical pressure of 10.5 GPa, where superconductivity accordingly emerges. No structural phase transition is observed under the pressure investigated. In situ high-pressure Hall coefficient measurements at low temperatures demonstrate that elevating pressure decreases the population of hole carriers but increases that of the electron ones. Significantly, at the critical pressure, a sign change of the Hall coefficient is observed.

No MeSH data available.


Related in: MedlinePlus