dorsal/arxiv
View SchemaLow-frequency method for magnetothermopower and Nernst effect measurements on single crystal samples at low temperatures and high magnetic fields
| Authors | E. S. Choi, J. S. Brooks, J. S. Qualls, Y. S. Song |
|---|---|
| Categories | |
| ArXiv ID | physics/0009054 |
| URL | https://arxiv.org/abs/physics/0009054 |
| DOI | 10.1063/1.1353192 |
Abstract
We describe an AC method for the measurement of the longitudinal (Sxx) and transverse (Sxy, i.e. Nernst) thermopower of mm-size single crystal samples at low temperatures (T<1 K) and high magnetic fields (B>30 T). A low-frequency (33 mHz) heating method is used to increase the resolution, and to determine the temperature gradient reliably in high magnetic fields. Samples are mounted between two thermal blocks which are heated by a sinusoidal frequency f0 with a p/2 phase difference. The phase difference between two heater currents gives a temperature gradient at 2f0. The corresponding thermopower and Nernst effect signals are extracted by using a digital signal processing method due. An important component of the method involves a superconducting link, YBa2Cu3O7+d (YBCO), which is mounted in parallel with sample to remove the background magnetothermopower of the lead wires. The method is demonstrated for the quasi two-dimensional organic conductor a-(BEDT-TTF)2KHg(SCN)4, which exhibits a complex, magnetic field dependent ground state above 22.5 T at low temperatures.
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"abstract": "We describe an AC method for the measurement of the longitudinal (Sxx) and\ntransverse (Sxy, i.e. Nernst) thermopower of mm-size single crystal samples at\nlow temperatures (T\u003c1 K) and high magnetic fields (B\u003e30 T). A low-frequency (33\nmHz) heating method is used to increase the resolution, and to determine the\ntemperature gradient reliably in high magnetic fields. Samples are mounted\nbetween two thermal blocks which are heated by a sinusoidal frequency f0 with a\np/2 phase difference. The phase difference between two heater currents gives a\ntemperature gradient at 2f0. The corresponding thermopower and Nernst effect\nsignals are extracted by using a digital signal processing method due. An\nimportant component of the method involves a superconducting link, YBa2Cu3O7+d\n(YBCO), which is mounted in parallel with sample to remove the background\nmagnetothermopower of the lead wires. The method is demonstrated for the quasi\ntwo-dimensional organic conductor a-(BEDT-TTF)2KHg(SCN)4, which exhibits a\ncomplex, magnetic field dependent ground state above 22.5 T at low\ntemperatures.",
"arxiv_id": "physics/0009054",
"authors": [
"E. S. Choi",
"J. S. Brooks",
"J. S. Qualls",
"Y. S. Song"
],
"categories": [
"physics.ins-det",
"physics.gen-ph"
],
"doi": "10.1063/1.1353192",
"title": "Low-frequency method for magnetothermopower and Nernst effect measurements on single crystal samples at low temperatures and high magnetic fields",
"url": "https://arxiv.org/abs/physics/0009054"
},
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