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 Strongly Correlated ES

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Strongly Correlated Electron Systems

The head of the group is Professor Alexander N. Vasil'ev.

The main interests of the group deal with quantum cooperative phenomena in solids: low-dimensional magnetism; magnetism and superconductivity; interplay between spin, orbital and charge degrees of freedom. The second direction of investigation is the study of physical principles of magnetically driven shape memory effect.

Main directions of research:

  • Low-dimensional magnetism.

  • Colossal magnetoresistance effect.

  • Magnetically driven shape-memory effect.

  • Multiferroelectricity

 Staff:

  • Head of Low Temperature Physics and Superconductivity Department, Prof. Alexander Vasil’ev.

  • Dr. Maria Markina

  • Dr. Elena Popova

  • Dr. Vladimir Khovailo

  • Researcher Konstantin Klimov

  • Engineer Igor Romanenko

 Post Graduated Students:

  • Alexander Sokolov
  •  Roman Chtsherbov
  • Olga Volkova

Students:

  • Tatiana Susanina
  • Sergej Vjahirev
  • Ekaterina Kadyrova
  • Tatiana Vasil’chikova

 Tools for research available in the lab:

  • Quasi-adiabatic microcalorymetry (T = 6 – 300 K, msample ~ 100 mg)

  • Thermal expansion coefficient measurements (T = 4.2 –300 K)

  • Low-field magnetic susceptibility (T = 4.2 – 300 K, H = 100 Oe)

  • Thermal conductivity (T = 4.2 – 300 K)

  • Resistivity (T = 4.2 – 300 K)

  • Megnetoresistance (T = 4.2 – 300 K, H = 1 T)

  • Solid state synthesis (furnaces up to 1400 ºC)

  • Single crystals synthesis from the melt

Publications:

  •  Low-dimensional magnetism.

A.N.Vasil'ev, V.I.Marchenko, A.I.Smirnov, S.S.Sosin, H.Yamada, Y.Ueda. 
Magnetic ordering in the mixed-valence compound b-Na0.33V2O5. 
Phys. Rev. B 64,174403 (2001).

A.N.Vasil'ev, M.M.Markina, A.V.Inyushkin, and H.Kageyama.
Thermal Conductivity and Specific Heat of SrCu2(BO3)2: A Quasi-Two-Dimensional Metal Oxide Compound with a Spin Gap.
 JETP Lett. 73, 633 (2001).

A.N.Vasil'ev, M.M.Markina, M.Yu.Kagan, M.Isobe, and Y.Ueda.
Specific Heat of Na1 – xV2O5 Single Crystals. 
JETP Lett. 73, 357 (2001).

Х. Кагеяма, А.Н. Васильев.
Сетка ортогональных димеров в уникальном металлооксиде.
Природа N2, 21-28 (2002).

A.N. Vasil'ev, T.N. Voloshok, O.L. Ignatchik, M. Isobe, Y. Ueda.
Long range and short range magnetic order in new compound NaVGe2O6.
JETP Lett. 76, 35-38, (2002).

 M. Markina, A. Vasil’ev, M. Isobe Y. Ueda.
Specific heat and magnetic entropy of Na1-xV2O5.
JMMM 242-245, 735-737 (2002).

M. Isobe, E. Ninomiya, A.N. Vasil'ev and Y. Ueda.
Novel Phase Transition in Spin-1/2 Linear Chain Systems: NaTiSi2O6 and LiTiSi2O6.
J.Phys.Soc.Jpn., 71 1423 (2002).

M.Markina, A. Vasiliev, J. Mueller, M. Lang, K. Kordonis, T. Lorenz, M. Isobe, Y. Ueda.
Thermal properties of NaV2O5.
JMMM 258-259, 398-400 (2003)

M. Isobe, Y. Ueda, A.N. Vasiliev, T.N. Voloshok, O.L. Ignatchik.
Long-range and short-range magnetic order in NaVGe2O6.
JMMM 258-259 125-127 (2003).

T.Masuda, A.Zheludev, H. Kageyama, A.N. Vasil’ev.
BiCu2VO6: A new narrow-band spin gap material.
Europhys.Lett. 63(5), 757-763 (2003).

А.Н. Васильев, О.Л. Игнатчик, А.Н. Соколов, Z. Hiroi, M. Isobe, Y. Ueda.
Дальний магнитный порядок в квазиодномерных металлооксидах NaCrSi2O6 и NaCrGe2O6.
Письма в ЖЭТФ, 78, 1039-1042 (2003).

O. Vyaselev, M. Takigawa, A. Vasiliev, A. Oosawa, H. Tanaka.
Field – induced magnetic ordering in TlCuCl3: lattice deformation and features of first – order transition.
Physica B, 329, 892 – 893 (2003).

T. Masuda, A. Zheludev, A. Bush, M. Markina, A. Vasiliev.
Competition between helimagnetism and commensurate quantum spin fluctuations in LiCu2O2.
Phys. Rev. Lett. 92, 177201 (2004).

O. Vyaselev, M. Takigawa, A. Vasiliev, A. Oosawa, H. Tanaka.
Field-induced magnetic order and simultaneous lattice deformation in TlCuCl3.
Phys. Rev. Lett. 92, 207202 (2004).

М. Маркина, К. Климов, А.Н. Васильев, A.Фреймут, К. Кордонис, М. Крайнер, Т. Лоренц, Т. Ямаучи, Ю. Уэда.
Последовательность фазовых переходов в квазиодномерном соединении с переменной валентностью b-Na0.33V2O5.
Письма в ЖЭТФ, 79, 670-673 (2004).

A.N. Vasiliev, O.L. Ignatchik, M. Isobe, Y. Ueda.
Long range Neel order in quasi-one-dimensional vanadium-based (S = 1) pyroxenes (Li,Na)V(Si,Ge)2O6.
Phys. Rev. B 70, 132415 (2004).

A.N. Vasiliev, M.M. Markina, and E.A.Popova.
Spin gap metaloxides.
FNT, 31, 203 (2005).

N. Johanssen, A. Vasiliev, A. Oosawa, H. Tanaka, and T. Lorenz.
Magnetoelastic Coupling in the Spin-Dimer System TlCuCl3.
Phys. Rev. Lett. 95, 017205 (2005).

T. Masuda, A. Zheludev, B. Roessli, A. Bush, M. Markina, and A. Vasiliev.
Spin waves and magnetic interactions in LiCu2O2.
Phys. Rev. B 72, 014405 (2005).

A.N. Vasiliev, O.L. Ignatchik, A.N. Sokolov, Z. Hiroi, M. Isobe, and Y. Ueda.
Long-range magnetic order in quasi-one-dimensional chromium-based (S = 3/2) pyroxenes (Li,Na)Cr(Si,Ge)2O6,
Phys. Rev. B 72, 012412 (2005).

A. Moreira dos Santos, V.S. Amaral, P. Brandao, F.A. Almeida Paz, J. Rocha, L.P. Ferreira, M. Godinho, O. Volkova and A. Vasiliev.
Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O11 2H2O and Na2Cu2Si4O11.
Phys. Rev. B 72, 092403 (2005).

  • Colossal magnetoresistance effect

A.N.Vasil'ev, T.N.Voloshok, and R.Suryanarayanan. 
Phase Transition in Electronic Manganite Ca0.85Sm0.15MnO3.
JETP Lett. 73, 349 (2001).

A.Vasil'ev, T.Voloshok, M.Apostu, R.Suryanarayanan, and A.Revcolevschi. 
Spin-Reorientation Transition at Isoelectronic Substitution in Double-Layer Manganites (La1 – zPrz)1.2Sr1.8Mn2O7. 
JETP Lett. 73, 630 (2001).

A.M.Abakumov, M.G.Rozova, B.Ph.Pavlyuk, M.V.Lobanov, E.V.Antipov, O.I.Lebedev, G.Van Tendeloo, O.L.Ignatchik, E.A.Ovtchenkov, Yu.A.Koksharov, A.N.Vasil'ev. 
Synthesis, crystal structure, and magnetic properties of a novel layered manganese oxide Sr2MnGaO5+delta
J. Solid State. Chem., 160, 353-361 (2001).

D.A. Filippov, R.Z. Levitin, A.N. Vasil'ev, T.N. Voloshok, H. Kageyama, and R. Suryanarayanan.
Spontaneous and field-induced magnetostructural transitions, giant magnetostriction, and specific heat in Ca0.85Sm0.15MnO3.
Phys. Rev. B, 65, 100404 (2002).

R. Suryanarayanan, A. Vasil’ev, T. Voloshok.
Transport, magnetic and thermal properties of electron-doped manganite Ca0.85Sm0.15MnO3.
JMMM 242-245, 695-697 (2002).

D.A. Filippov, R.Z. Levitin, A.N. Vasil’ev, T.N. Voloshok and R. Suryanarayanan.
Spontaneous and field-induced magnetostructural phase transitions in electron-doped manganites (Sm,Nd)0.2Ca0.8MnO3.
Physica B, 327, 155-158 (2003).

D.A. Filippov, K.V. Klimov, R.Z. Levitin, A.N. Vasil’ev, T.N. Voloshok, R. Suryanarayanan.
Enhancement of the phase separation aspect in the electron doped manganite Ca0.8Sm0.16Nd0.04MnO3.
J.Phys.: Condens. Matter 15, 8351-8361 (2003).

I.O. Troyanchuk, V.A. Khomchenko, G.M. Chobot, A.I. Kurbakov, A.N. Vasil’ev, V.V. Eremenko, V.A. Sirenko, M.Yu. Shvedun, H. Szymczak, R. Szymczak.
Spin-reorientational transitions in low-doped Nd1-xCaxMnO3 manganites: the evidence of an inhomogeneous magnetic state.
J.Phys.: Condens. Matter 15, 8865-8880 (2003).

А.Н. Васильев, О.С. Волкова, Е.А. Гудилин.
Отрицательное магнитосопротивление в двойных искаженных перовскитах Ca(CuxMn3-x)Mn4O12.
ЖЭТФ 128, 422-427 (2005).

О. Волкова, Ю. Аранго, Н. Тристан, В. Катаев, Е. Гудилин, Д. Мейер, Т. Лоренц, Б. Бюхнер, A. Васильев.
О природе низкотемпературных фазовых переходов в CaMn7O12.
Письма в ЖЭТФ 82, 498-500 (2005).

  • Magnetically driven shape-memory effect

T.Takagi, V.Khovailo, T.Nagatomo, H.Miki, M.Matsumoto, T.Abe, Z.Wang, E.Estrin, A.Vasil'ev. 
Magnetostrain in Ni2+XMn1-XGa compounds prepared by arc-melting and SPS methods. 
Transactions of the Materials Research Society of Japan, 26, 197-200 (2001).

V.V.Khovailo, T.Takagi, A.N.Vasil’ev. 
On order-disorder (L2(1) -> B2 ') phase transition in Ni2+xMn1-xGa Heusler alloys. 
Phys. Stat. Sol. A 183, 1-3 (2001).

А.Н. Васильев, В.Д. Бучельников, Т. Такаги, В.В. Ховайло, Э.И. Эстрин.
Ферромагнетики с памятью формы.
УФН, 173 (6), 577 (2003).

A. Vassiliev.
Magnetically driven shape memory alloys.
JMMM 242-245, 66-67 (2002).

V.D. Buchelnikov, A.N. Vasiliev, T. Takhagi, S.V. Taskaev, V.G. Shavrov.
Phase diagrams of a shape – memory cubic ferromagnet represented as stress versus temperature graphs,
J.Comm. Technology and Electronics, 48, 1148 – 1157 (2003).

V.D. Buchelnikov, A.N. Vasiliev, T. Takhagi, Taskaev S.V., Shavrov V.G.
The influence of an elastic stress applied along the [001] axis on structural phase transitions in a cubic ferromagnetic.
J.Comm. Technology and Electronics, 48, 1039 – 1046 (2003).

S.V. Taskaev, V.D. Buchelnikov, A.N. Vasil’ev, T. Takagi.
Influence of external stress along [001] axis on phase diagram of cubic ferromagnet with shape memory effect.
Int. J. Appl. Electromagnetics and Mechanics, 19, 421 – 426 (2004).

A.Vasil’ev, T. Takagi.
Ferromagnetic shape memory alloys Ni2±x±yMn1±xGa1±y.
Int. J. Appl. Electromagnetics and Mechanics, 20, 37 – 56 (2004).

V.V. Khovailo, V. Novosad, T. Takagi, D.A. Filippov, R.Z. Levitin, A.N. Vasil’ev.
Magnetic properties and magnetostructural phase transitions in Ni2+xMn1-xGa shape memory alloys.
Phys. Rev. B 70, 174413 (2004).

S.I. Bosko, V.D. Buchelnikov, S.V. Taskaev, T. Takagi and A.N. Vasiliev.
Kinetics and relaxation processes in Ni-Mn-Ga alloys under an external stress and a magnetic field.
Int. J. Appl. Electromagnetics and Mechanics, 21, 11 – 19 (2005).

V.D. Buchelnikov, V.V. Khovailo, A.N. Vasiliev, and T. Takagi.
Influence of volume magnetostriction on the T-x diagram of shape memory Ni2+xMn1-xGa alloys.
JMMM, 290 – 291, 854 – 856 (2005).

  •   Multiferroelectricity.

R.Z. Levitin, E.A. Popova, R.M. Chtsherbov, A.N. Vasiliev, M.N. Popova, E.P. Chukalina, S.A. Klimin, P.H.M. van Loosdrecht, D. Fausti, L.N. Bezmaternykh.
Cascade of phase transitions in GdFe3(BO3)4.
Письма в ЖЭТФ, 79, 531 – 534 (2004).

  Internation collaboration:

Oak Ridge National Laboratory (Dr. A. Zeludev)
 http://www.ornl.gov

Leibniz Institute for Solid State and Material Research Dresden (Prof. B. Buehner)
 http://www.ifw-dresden.de/eindex.htm

Bordeaux Institute of Condensed Matter Chemistry (Prof. G. Demazeau)
 http://www.icmcb.u-bordeaux.fr/usindex.html

Institute for Solid State Physics Tokyo University (Prof. Y. Ueda)
 http://www.issp.u-tokyo.ac.jp/index_e.html

Institute of Physics II, University of Cologne (Dr. T. Lorenz)
 http://www.ph2.uni-koeln.de/en/

Institute of Physics for Condensed Matter, TU Braunschweig (Prof. P. Lemmens)
 http://www.ipkm.tu-bs.de

Insitute of Fluid Science Tohoku University (Prof. T. Takagi)
 http://www.ifs.tohoku.ac.jp/index_e.html