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1

Magnetization Studies of Cu_{0.058}TiSe_{2} Near a Quantum Critical Point

100%

Husaníková P., Cambel V., Fedor J., Šoltýs J., Karapetrov G.

Acta Physica Polonica A

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2014

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vol. 126

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issue 1

336-337

EN

We study superconducting properties of highly underdoped Cu_{0.058}TiSe_{2} single crystal by means of bulk magnetization measurements. We extract the upper critical field, H_{c2}, for magnetic field applied parallel, as well as perpendicular to the sample planes. Obtained values, H^{ab}_{c2}(0)=1.03 T and H^c_{c2}(0)=0.54 T, define a moderate anisotropy of the upper critical fields of 1.90. From the upper and lower critical fields we extract the Ginzburg-Landau parameters κ_{ab}(0)=26.3, and κ_c(0)=12.6 that classify Cu_{0.058}TiSe_{2} as an extreme type II superconductor.

2

Specific Heat Study of Superconductivity in Cu_{0.061}TiSe_{2}

86%

Kačmarčík J., Pribulová Z., Pal'uchová V., Husaníková P., Karapetrov G., Komanický V., Samuely P.

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EN

In TiSe_{2} a charge-density-waves order is continuously suppressed by copper doping and superconductivity appears. We report a calorimetric study performed on the superconducting single crystal of Cu_{0.061}TiSe_{2} with T_{c}=2.8 K, measured by the ac technique at low temperatures down to 0.6 K and magnetic fields up to 2 T. Sharp specific heat anomaly at the superconducting transition is found. The temperature dependence of the electronic specific heat and the angular dependence of the critical temperature, measured at a fixed magnetic field, consistently indicate on the existence of a single s-wave superconducting gap with a coupling strength of 2Δ/k_{B}T_{c}=3.6, close to BCS limit.

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Local Magnetometry of Cu_{0.064}TiSe_{2}

73%

Pribulová Z., Medvecká Z., Kačmarčík J., Komanický V., Klein T., Husaníková P., Cambel V., Šoltýs J., Karapetrov G., Samuely P.

Acta Physica Polonica A

|

2014

|

vol. 126

|

issue 1

370-371

EN

Local magnetometry using miniature Hall-probe array was used to study vortex distribution in superconducting single crystal of Cu_{x}TiSe_{2}, with x=0.064 and T_{c}=3.2 K. We show that vortices after penetration into the sample move towards the center, resulting into a dome-shape field profile. Such a profile is a signature of relatively low pinning. We show that these measured profiles are consistent with a model proposed for the samples in the absence of bulk pinning. Modifications necessary to obtain quantitative agreement between the model and the data are presented.

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3 Acta Physica Polonica A

3 2014

3 Husaníková P.

3 Karapetrov G.

2 Cambel V.

2 Kačmarčík J.

2 Komanický V.

2 Pribulová Z.

2 Samuely P.

2 Šoltýs J.

1 Fedor J.

1 Klein T.

1 Medvecká Z.

1 Pal'uchová V.

Magnetization Studies of Cu_{0.058}TiSe_{2} Near a Quantum Critical Point

Specific Heat Study of Superconductivity in Cu_{0.061}TiSe_{2}

Local Magnetometry of Cu_{0.064}TiSe_{2}