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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

High-pressure electrical resistance versus temperature under different magnetic fields.(a,b) The electrical resistance as a function of temperature at 0.3 and 2.4 GPa, respectively, illustrating the obvious suppression of the LMR effect by increasing pressure. (c) The plot of resistance versus temperature at 11.0 GPa. The inset shows an enlarged view of a full suppression of the positive magnetoresistance and a zero resistance at 3.2 K. (d) The temperature dependence of electrical resistance at 13.0 GPa. The inset displays the elimination of superconductivity by magnetic fields.
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f4: High-pressure electrical resistance versus temperature under different magnetic fields.(a,b) The electrical resistance as a function of temperature at 0.3 and 2.4 GPa, respectively, illustrating the obvious suppression of the LMR effect by increasing pressure. (c) The plot of resistance versus temperature at 11.0 GPa. The inset shows an enlarged view of a full suppression of the positive magnetoresistance and a zero resistance at 3.2 K. (d) The temperature dependence of electrical resistance at 13.0 GPa. The inset displays the elimination of superconductivity by magnetic fields.

Mentions: To reveal how the LMR state evolves into the superconducting state, we systematically investigate the temperature dependence of electrical resistance at fixed pressures under different magnetic fields. We find that the positive LMR effect of WTe2 is suppressed by applying pressure (Fig. 4a,b). At the pressure of 11.0 GPa and above, the positive magnetoresistance effect no longer exists (Fig. 4c,d), and the superconductivity appears simultaneously.


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)

High-pressure electrical resistance versus temperature under different magnetic fields.(a,b) The electrical resistance as a function of temperature at 0.3 and 2.4 GPa, respectively, illustrating the obvious suppression of the LMR effect by increasing pressure. (c) The plot of resistance versus temperature at 11.0 GPa. The inset shows an enlarged view of a full suppression of the positive magnetoresistance and a zero resistance at 3.2 K. (d) The temperature dependence of electrical resistance at 13.0 GPa. The inset displays the elimination of superconductivity by magnetic fields.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: High-pressure electrical resistance versus temperature under different magnetic fields.(a,b) The electrical resistance as a function of temperature at 0.3 and 2.4 GPa, respectively, illustrating the obvious suppression of the LMR effect by increasing pressure. (c) The plot of resistance versus temperature at 11.0 GPa. The inset shows an enlarged view of a full suppression of the positive magnetoresistance and a zero resistance at 3.2 K. (d) The temperature dependence of electrical resistance at 13.0 GPa. The inset displays the elimination of superconductivity by magnetic fields.
Mentions: To reveal how the LMR state evolves into the superconducting state, we systematically investigate the temperature dependence of electrical resistance at fixed pressures under different magnetic fields. We find that the positive LMR effect of WTe2 is suppressed by applying pressure (Fig. 4a,b). At the pressure of 11.0 GPa and above, the positive magnetoresistance effect no longer exists (Fig. 4c,d), and the superconductivity appears simultaneously.

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