Paper
0
Heat and Charge Transport Properties of MgB2
Authors
Matthias Schneider,Dieter Lipp
Alexander Gladun,Peter Zahn,Axel Handstein,Guenter Fuchs,Stefan-Ludwig Drechsler,Manuel Richter,Karl-Hartmut Mueller,Helge Rosner,Ihor Borokhvostov,Felipe Pereira,Diego Mariano,Masabumi Minami,Peter K.N. Yu,Maria Antonia Diez,Ilgiz Gareev,Sylvester Gates,Olga Lozovskaya,Marina Melnichuk,Sanan Hamidov,Hanna Yeromina,Fedir Yatsenko,Рита Гильманова,Oleg Sokolov,Astrid VABRET,Krzysztof Pyrc,Елена Валерьевна Землянова,Олег Галимов,sergey mosin,Goncha Allakhverdieva,Tatiana Danzanova,Panakhyd Halyna,giovanni raugei,Luis Banares,Евгений Романов,Ксения Новак,Victoria Khotina,Сергей Подвязников,Игорь Гельфанд,Maya Kashuba,Avetik Muradyan,Илья Маркович Каганцов,Rachel Gold,Natalya Solovjova,Jae-Ho Shin,Stegantseva Veronika,Indu Khatri,Ronald Dijkman,Maria Kishkurno,Михаил Козыревский,Balakrishnan Ramakrishna,srikrishna subramanian,Euclydes Marega Jr.,Carmen Barriocanal,Leonid Fedorov,Kristen Davenport,Francisco Gamarro,Santiago Castanys,LEANDRA SILVESTRO,Rachael Clark,Dong Guo,William Smith,Derry Mercer,Yuri Alymov,Igor Kartashov,Bin Wang,Tahvi Frank,Elena Escubedo,Mitsuhiko Maesato,Yutaro Neriya,Vincent Rodgers,Vsevolod Potapenko,Suresh Tiwari ,Zulfiya Baktybaeva,Adam Andreotta,Kazuo Tsushima,Jennifer Town,Jose Ignacio Espeso,Volkmar Falk,Rosa da Conceição da Silva Moreira,George Borg,Lonnie Snowden,Douglas Taatjes,Iryna Azhaman,Roger Bumgarner,Ekaterina Gutop,Masaō Ashtine,Qingsheng Li,Dayeong Hong,Tamer Ibrahim,Haokun Qi,Sangwook Lee,Laura DE GIORGI,Wegdan Abd El Wahab,Charlene Harichund,Alexander Kulkov,Ivanna Stercho,Karin Ebert,Johanne Rauwenhoff,Åshild Vågene,Beata Zadykowicz,Pooja Mane,zahra piri,dayamoy banerjee,Javad Yahaghi,David Owen,peng geng,Siripong Somwan,Wei Wang,Per Norström,Evgeniia Georgievskaia,Martin Proksch,Mohsen Ghafory-Ashtiany,Maria Immacolata Vassallo de Lopes,Muammer Erdoğdu,Tom Boersen,Philip Wilkinson,Andrew Levey,Сергей (Sergii) Зори (Zori),Sang Nguyen,Junran Cao,Elizabet Monteagudo Cascales,Yulia Vainshtein,Anatoly Kutsbakh,Laura Esteve-Matalí,Rebecca Swartz,Mothaffar Rimawi,Fabiana Avolio Sayão,Susanne Teschl,Carolina Soto Navarro,ROSA CAROLI,Huijuan Wang,Abderrahman Sghaier,Jian-Lin Li,Nilda Josefina Paris,Yesenia Merino,Raja Mannar Badur,Francesco MAURO,Arnab Mukherjee,Mohamad-Al-Fadl Rihani,Cristina Mandrini,Alexandra Danchuk,Viktor Dnes,xinran ,D.L. 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arXiv:cond-mat/0105429v2 [cond-mat.supr-con] 8 Aug 2001 1
Heat and Charge Transport Properties of MgB2
Matthias Schneidera ∗, Dieter Lippa, Alexander Gladuna, Peter Zahnb, Axel Handsteinc, G¨unter
Fuchsc, Stefan-Ludwig Drechslerc, Manuel Richterc, Karl-Hartmut M¨ullerc, and Helge Rosnerd
aInstitut f¨ur Tieftemperaturphysik, Technische Universit¨at Dresden, D-01062 Dresden, Germany
bInstitut f¨ur Theoretische Physik, Technische Universit¨at Dresden, D-01062 Dresden, Germany
cInstitut f¨ur Festk¨orper- und Werkstofforschung e. V., D-01171 Dresden, Postfach 270116, Germany
dDepartment of Physics, University of California, Davis, CA 95616, USA
A polycrystalline sample of the MgB2 superconductor was investigated by measurements of the electrical resistivity, the
thermopower and the thermal conductivity in the temperature range between 1.8K and 300K in zero magnetic field. The
electrical resistivity shows a superconducting transition at Tc = 38.7K and, similarly to borocarbides, a T 2.4 behaviour up
to 200K. The electron diffusion thermopower and its bandstructure-derived value indicate the dominant hole character of
the charge carriers. The total thermopower can be explained by the diffusion term renormalized by a significant electron-
phonon interaction and a phonon drag term. In the thermal conductivity, for decreasing temperature, a significant decrease
below Tc is observed resulting in a T 3 behaviour below 7K. The reduced Lorenz number exhibits values smaller than 1 and
a characteristic minimum which resembles the behaviour of non-magnetic borocarbides.
Keywords: 74.25.Fy - Thermopower and thermal conductivity, 74.70.Ad - Magnesium Diboride, 74.70.Dd - Borocarbides.
1. INTRODUCTION
After the surprising discovery of superconduc-
tivity up to about 40K in MgB2 [1] extensive in-
vestigations of its physical properties have been
performed. Special interest is focused on the elec-
tronic structure and in particular, on the type of
the charge carriers, and their relationship to the
superconducting pairing mechanism. Numerous
studies are devoted to thermodynamic properties
such as the specific heat [2–5] and the upper crit-
ical field [6–10].
However, there are less reports published on
the transport properties of MgB2 and only few on
the heat transport. Results of previous investiga-
tions of the electrical resistivity ρ differ not only
in the residual resistivity but also in the tempera-
ture dependence [6,11–13]. First measurements of
the thermopower S [14–16] and the thermal con-
ductivity κ [17] show a significant non-linearity
in S(T ) in the temperature range close to room
temperature and rather high values for the Lorenz
number derived from the reported data of κ(T )
∗E-mail: schneid@physik.phy.tu-dresden.de
and ρ(T ). Such measurements are of general in-
terest since they provide additional insight into
the electronic structure and the electron-phonon
interaction. In the present paper, zero magnetic
field measurements of thermal and charge trans-
port properties of MgB2 are reported. Since at
present the pairing mechanism has not been set-
tled yet the comparison with related supercon-
ductors might be helpful to elucidate further de-
tails of the superconductivity in MgB2. In this
context also similarities and differences with the
behaviour of well studied non-magnetic borocar-
bides will be discussed.
2. EXPERIMENTAL DETAILS
The experiments were performed on a
polycrystalline sample of MgB2 of about
5 × 1.2 × 1.2mm3. It was cut from a pellet which
was prepared by a conventional solid state reac-
tion as described elsewhere [7]. The x-ray diffrac-
tion pattern of powder ground from this sample
batch have shown that the material is single
phased.
To investigate the thermopower S, two copper
Heat and Charge Transport Properties of MgB2
Matthias Schneidera ∗, Dieter Lippa, Alexander Gladuna, Peter Zahnb, Axel Handsteinc, G¨unter
Fuchsc, Stefan-Ludwig Drechslerc, Manuel Richterc, Karl-Hartmut M¨ullerc, and Helge Rosnerd
aInstitut f¨ur Tieftemperaturphysik, Technische Universit¨at Dresden, D-01062 Dresden, Germany
bInstitut f¨ur Theoretische Physik, Technische Universit¨at Dresden, D-01062 Dresden, Germany
cInstitut f¨ur Festk¨orper- und Werkstofforschung e. V., D-01171 Dresden, Postfach 270116, Germany
dDepartment of Physics, University of California, Davis, CA 95616, USA
A polycrystalline sample of the MgB2 superconductor was investigated by measurements of the electrical resistivity, the
thermopower and the thermal conductivity in the temperature range between 1.8K and 300K in zero magnetic field. The
electrical resistivity shows a superconducting transition at Tc = 38.7K and, similarly to borocarbides, a T 2.4 behaviour up
to 200K. The electron diffusion thermopower and its bandstructure-derived value indicate the dominant hole character of
the charge carriers. The total thermopower can be explained by the diffusion term renormalized by a significant electron-
phonon interaction and a phonon drag term. In the thermal conductivity, for decreasing temperature, a significant decrease
below Tc is observed resulting in a T 3 behaviour below 7K. The reduced Lorenz number exhibits values smaller than 1 and
a characteristic minimum which resembles the behaviour of non-magnetic borocarbides.
Keywords: 74.25.Fy - Thermopower and thermal conductivity, 74.70.Ad - Magnesium Diboride, 74.70.Dd - Borocarbides.
1. INTRODUCTION
After the surprising discovery of superconduc-
tivity up to about 40K in MgB2 [1] extensive in-
vestigations of its physical properties have been
performed. Special interest is focused on the elec-
tronic structure and in particular, on the type of
the charge carriers, and their relationship to the
superconducting pairing mechanism. Numerous
studies are devoted to thermodynamic properties
such as the specific heat [2–5] and the upper crit-
ical field [6–10].
However, there are less reports published on
the transport properties of MgB2 and only few on
the heat transport. Results of previous investiga-
tions of the electrical resistivity ρ differ not only
in the residual resistivity but also in the tempera-
ture dependence [6,11–13]. First measurements of
the thermopower S [14–16] and the thermal con-
ductivity κ [17] show a significant non-linearity
in S(T ) in the temperature range close to room
temperature and rather high values for the Lorenz
number derived from the reported data of κ(T )
∗E-mail: schneid@physik.phy.tu-dresden.de
and ρ(T ). Such measurements are of general in-
terest since they provide additional insight into
the electronic structure and the electron-phonon
interaction. In the present paper, zero magnetic
field measurements of thermal and charge trans-
port properties of MgB2 are reported. Since at
present the pairing mechanism has not been set-
tled yet the comparison with related supercon-
ductors might be helpful to elucidate further de-
tails of the superconductivity in MgB2. In this
context also similarities and differences with the
behaviour of well studied non-magnetic borocar-
bides will be discussed.
2. EXPERIMENTAL DETAILS
The experiments were performed on a
polycrystalline sample of MgB2 of about
5 × 1.2 × 1.2mm3. It was cut from a pellet which
was prepared by a conventional solid state reac-
tion as described elsewhere [7]. The x-ray diffrac-
tion pattern of powder ground from this sample
batch have shown that the material is single
phased.
To investigate the thermopower S, two copper
100%
